2 stroke engine locked up

Is this a 4 stroke? When you can't get your vintage two-stroke motorcycle engine running smoothly after checking the ignition timing and carburetion, it's possible that you have leak. Two things you can't have too much of in freeing a seized engine. Any piston which is at TDC or BDC will not give you any mechanical advantage in rotating the assembly by hitting it. All you have to do for the moment is crack the rings loose a thousandth of an inch to allow the penetrating oil to get in between the rings and cylinder walls. Is the engine seized because of neglect/rust/corrosion, or is it because of a mechanical failure like a broken crankshaft, thrown rod, spun bearing or seized piston from detonation, etc. Dirt and water within the engine is the worst kind of engine lock that you can experience. Engines can get locked due to the high amount of water in cylinders. They do work together as a suspension though. It should eventually free up. Remove the rags and let the excess penetrating oil escape from the cylinder, while you spin the motor. Unsticking an engine in a manual transmission vehicle, controlled (but unscientific) study on penetrating oils, https://www.crankshaftcoalition.com/wiki/index.php?title=Freeing_a_stuck_engine&oldid=3476427. 2. Do not use pulleys or the outside ring of balancers to turn over the engine if at all possible. If it's the frame of the car or truck, that's good. Before you get out the sledge hammer and a block of wood and start pounding your meat there are a few things to consider. A breaker bar can be substituted for an impact wrench, but it is important to use a hammer to tap the breaker bar to shock the stuck components. Get some help if you think you need it. Start by turning the crank, even a small amount will - over time and with repetition - cause it to break loose. Two pistons right at the top, other two down. Reattach the spark plug wires and close the top motor case cowl. I’m fairly decent with engines so I figured I’d try to fix it. Last edited by a moderator: Jul 28, 2011. It is strongly recommended to research this fully before undertaking the procedure. The ratio of water to oil that comes out of the oil pan is an indication of whether the reciprocating assembly was submerged or not. This torque multiplication will move the crank journal a degree or two and will push or pull on the piston which in turn will apply thrust against the rings. While removing the air cleaner, check for moisture or water puddles in the oil bath or in the bottom of the filter housing. FOR SALE - Denver, CO - Bike is in good shape but engine is ceased due to sitting too long. You need something that will penetrate, stay wet, and wick its way up into the smallest area. How to Pressure Check a 2-Stroke Engine. One school of thought is that it's better to leave it be, if the engine cannot be taken apart for a thorough cleaning. Disconnect the electrical wire jack that attaches to the power pack. If possible obtain some thick-walled steel pipe and machine it to be a clearance fit in the bore. Engines from boats which have sunk are much more difficult. Thanks in advance." At this point the starter motor was tried but the battery was too weak. Open the radiator cap and check for coolant. Locked Up Engine Symptoms – How to Tell If Engine Is Locked Up Before you can even confirm that this is a problem, you need to know how to tell if your engine is locked up. Flood the engine block with the fluid of your choice. The dust may also have acids and alkalies (caustics) attached to it, and together with water vapor will etch the bearing and journal surfaces. Outboard marine motors can suffer a number of maladies that cause hard-starting or no-start conditions, but they usually turn over via the pull start or electric starter. Remove spark plugs and spray Sea Foam Deep Creep [ one can on each side of block ] into cylinders and let sit for 1-2 days. I have found that Oil of Wintergreen is a wonderful penetrant. If you just wound up and smacked it dead center with a ball peen hammer, you would probably just put a hole in it and it would still remain stuck. Transport the motor inside a garage area. Ordinary motor oil will coat but penetrates at a very slow pace. Mine moved about 1/8". Use an assistant to help with the lifting. It's time consuming and may be a bit of work, but the object is to SAVE the engine. Good luck and the hardest part, HAVE PATIENCE. Unfortunately even when the starting handle had timbers clamped on it for extra leverage the engine could still not be turned! Now my question is, what should I do? If the engine begins to turn, stop. This locking due to water is called hydro lock and it can seize the engine. Fill cylinders again and reinsert plugs. As the piston rises, it compresses the fuel and air. What condition was the engine left in when last turned over, is there oil in it still, or water? Two pieces of 1/4″ thick cold-rolled steel about 1-1/4″ and 2-1/2″ long were drilled in three places to allow bolting to the bronze connecting rod in lieu of the end cap and also to hold a long threaded bolt 3/8″ diameter and 5″ long. Be sure to lubricate after draining/blowing off the antifreeze. Pull the dipstick and check for water in the engine oil. The basics of unsticking any engine are the same. Instead, the safest/easiest way to turn the crank is to use a tool that allows a large ratchet or breaker bar to be used, like the crank turning devices shown below. I was told the craft was sunk and took on water over a year ago. What condition was the engine left in when last turned over, is there oil in it still, or water? with ATF and run the engine. If snow is blown into the engine compartment, it will melt and puddle out inside the air cleaner, intake manifold, lifter valley, etc, but not necessarily make its way deep into the engine. The rings, which are cast iron, are usually stuck to the cast iron cylinder walls but only in the cylinders which are open to the atmosphere. Acetone is highly flammable, especially so when suspended in air and should be handled with care. Insert the plug in the cylinder that's on the compression stroke and pump it full of grease using a grease gun filled with cheap light weight grease (like Lubriplate white grease). Most importantly: Start by removing the air cleaner. Flood waters also have a large presence of silt, chemicals of unknown nature, and varying pH. Have your assistant help you remount your engine on the transom then connect the cables, fuel line and wire jack you removed. Give it a couple minutes/hours/days so it can work on the rust. If you find water in the oil, try to determine how much there is. This takes HOT water, 180 degree or so. If the piston or pistons that cannot complete their travel cycle are prevented from doing so by a liquid above them, they slam to a halt on the upstroke, hence the “lock” in hydrolock. If it doesn't turn over at fifty psi it's not ready. Many flooded engines will just have to wait, sometimes until after the winter freeze-up, sometimes even longer. For that reason, diesel fuel is not recommended for use unless that is all that's available. I just picked up an Echo PB-500t off of Craigslist for $50 with a seized engine. Use a commercial engine flush, following the directions. Note: Some years ago, a machinist's magazine did a controlled (but unscientific) study on penetrating oils, and found that ATF mixed 50/50 with acetone outperformed all other penetrating oils by a wide margin. If some all-thread can be obtained that will fit the stud holes in the block a hydraulic jack can be rigged-up but the key ingredient is TIME. Crank keys and keyways can shear with abnormal force. 2- Pulled the starter, gear teeth are good and turns freely. Unsnap the top motor cowl case and pull the plug wires off the spark plugs. Exceeding the torque rating of the crank bolt can - and will - snap it off, costing a lot of time and trouble to fix. If an engine’s piston cannot complete its full travel cycle -- up to its minimum at the top of its stroke, then down to its maximum at the bottom of its stroke -- the engine cannot turn over. Most metals will form what is known as an oxide, where oxygen from the air mixes on the surface with the base metal. Diesel fuel is a middle-of-the-road fluid that will creep, coat and stay wet over time but reeks to high hell and will stink up everything it contacts- you included. The theory here is the heat will expands the cast iron block faster than the pistons; the extra clearance this creates gives the penetrating oil a better chance at reaching the stuck areas as well as may break any bonds formed by rust/corrosion. One of the more serious problems involves a freeze-up or locked position when the motor refuses to turn at all. Remove the rags and inject more penetrating oil into the spark plug holes and let it soak for two hours. ? Stevenson holds a P.D.S Toyota certificate, ASE brake certification, Clean Air Act certification and a California smog license. Place the motor in an upright position on a dolly truck, so that the propeller faces outward, and screw the motor mount clamps around the top plate of the dolly truck. The penetrant between the ring and the wall will eventually break the ring free from the cylinder wall. Copyright 2021 Leaf Group Ltd. / Leaf Group Media, Seized-engine.com: How to Use Engine Release. by: Alittle1, Cobalt327, Countryboytn, Crashfarmer, Crosley, GypsyR, Jon(Click here to edit this page anonymously, or register a username to be credited for your work.). Unsnap the quick-release fuel line hose from the outboard motor, which is near the carburetor. In doing so the engine is nicely locked up. Just used all methods above and freed up Mercruiser 200 that sat for 2 years with oil drain pug removed and water filling up the oil pan. Could we have just dropped a valve on the piston and it's stuck there? Using an oak block and a dead blow hammer of your choice, SHOCK each piston with a few blows. I figure i have 3 options. Aluminum will form a white powdery residue (aluminum oxide, or aluminum 'rust) and may form a dark grey to almost black coating caused by the oxidation of the metal. If the engine was flooded excessively, there will be basically no oil left; it will have been pushed out by the rising water. Use whichever is accessible with the least effort. Hey guys, I have a 2003 Sea doo that I just accumulated through family for free. Unscrew the motor mount clamps and remove the motor from the transom of the boat. Know what metal that you are working with and apply the correct solution to get the best result. Generally after a few days I can usually free up a stuck or seized engine. Take the breaker bar and turn the crank pulley back a bit and then hit the starter button again to put some torque on the flywheel. It is possible that the mainshaft gears and the clutch are locked up but usually it is the pistons. If it turns, the engine isn’t seized, and you should look for a different cause. Mine let go tonight after 2 weeks of this treatment, great feeling. Fill (fully or half and half, etc.) Turn the impact wrench on for four or five seconds, letting the vibration hammer of the tool shock the shaft. If using an engine stand, use caution that it doesn't tip. You can cycle through a few times if you want. I just bought a small project boat from the family of a 92 year old man who had just passed away. We have access to free lubricants. If you're going to do a compression test or a leakdown test, drain and refill with new oil. Is it the piston(s), the crank, the cam and valve train, the rods, or a combination of all these? If your engine has seized up while you’re driving, there’s nothing you can do about it short of an intensive engine repair or replacement. You'll be turning it over without spark plugs, so watch for spray coming out of the plug holes. Trying to force the starting handle stripped the thread on the aluminum alloy jaw nut so that method of attack had failed. Remember to try to rock the crank CW and CCW. Make sure that cylinders have sufficient oil so that the engine works properly. With Proforms Engine rotation adapter p/n 66782 or similar remove the pulleys and install adapter to front of harmonic balancer, attempt to turn crank in small increments. To avoid this scenario, change the lawn mower's engine oil at scheduled intervals … It would be a hell of a waste if we just gave up on an engine just because it wouldn't turn over. The most significant indication of a locked engine is that your car will not start, and the engine does not turn at all. Another approach is to put some Marvel Mystery Oil, WD-40 or PB Blaster into each cylinder and then pressurize with compressed air. Once the drive wheel rotates several revolutions, pull the vehicle in high gear several miles with all the plugs removed. Should you choose to use ATF and acetone, be aware that the two components don't actually mix. Also note that striking the crown of the piston is a very bad idea so ones oak block should be relieved in the middle. You can remove an upper radiator hose housing and check under the thermostat, too. In any case one also needs to consider the three-score-and-ten aspect when undertaking such lengthy tasks. 1) Patience and 2) penetrating oil. If you apply enough force in the proper direction, yes it would help. Petroleum or mineral spirits will get into small places but will dry out over time. The first clue was when Kellon started the bike and it locked up solid during warm-up. The engine then fired-up and ran OK and at this point the astonished seller rushed out and said "Are you an electrician or something?" Remember, the tensile strength of steel is greater than wood. Attach the impact wrench to the crankshaft nut and turn it on. To make matters worse, water may have also entered through the oil breather and is now (or was) present in the oil pan. The acceptable method involves turning the engine from the flexplate/flywheel, or by using a crankshaft socket that fits over the snout of the crank or bolts to the damper. Plumbers suppliers sell pipe-freezing kits (BP of the Freon replacement -50C) so it is fairly easy to freeze a piston to try to un-stick it from its bore. Keep the engine in a secure holding device. Try it if you want to. It will turn much faster and build up some oil pressure while cleaning out the oil galleys and internals. Like I say, most times it will be the piston(s) that are locked up. Place rags over the spark plug holes. Add a gallon or so of diesel fuel and a new filter, and turn it over with the starter for a minute or so. If the engine has been flooded by means of overland flooding and rising water, then you could also have an accumulation of silt and dirt within the engine. Fill it up with a fluid that will penetrate and lubricate the stuck surfaces. That means that you can loosen the belts or remove the alternator, water pump, intake and exhaust manifolds, distributor, heads, oil pan, etc. Attach two feet of clear plastic hose on the tip of a clean turkey baster and insert the free end of the hose down into the spark plug hole. Usually a two stroke will overheat and the piston gets too large for the bore and it seizes against the cylinder wall stopping the engine - technically, the piston melts and welds itself to the cylinder - the cylinder is steel and the piston is aluminum so the weld is not strong - when the engine cools, the weld will break and depending on the severity of the seizure, the rings may not be stuck in their … One way is to use a homemade oil burner water heater system with a pump. An air chisel with a flat bit and an oak block like the mushroom end of an axe handle works well. 2) Look into getting a new motor. Continue to turn crank. Blow in the hose, if you can't easily then you have the one on compression stroke (if you use a compression tester hose make sure it has no Schrader valve in it). Fill the turkey baster with penetrating oil, and then inject 1/2 to 1 ounce of oil into each cylinder. There are two places in which you can apply rotational force; the crank pulley and the flywheel. From underneath everything looks good. Fuel Tank Filter. It helps if you completely loosen the rockers first so any cylinder you charge has the valves closed. Just let the bit vibrate the oak block and piston. Would hitting a stuck piston help it to move? Remove the glow plug for sure, and possibly the backplate (however you risk tearing the gasket so might be worth soaking without removing first). If the engine is loose, find a way to hold it down. Mercury Marine, based in Wisconsin, has been making Mercury outboard motors in two- and four-stroke versions ranging from 2.5 to 350 horsepower for more than 75 years, though the company's first motors did not have as much horsepower as some of its current motors. I've used Parts Blaster & Penetrating Oil to free locked up 4 stroke engines on mowers.. can i use this method on two strokes as well? Usually just loosening the belts will help with this. You can only have so many intake valves open at one time, and the water would have only migrated into those cylinder bores. Before you get out the sledge hammer and a block of wood and start pounding your meat there are a few things to consider. After allowing the penetrant to settle in for a few minutes to overnight, try to turn the crank in the reverse direction of rotation (CCW as you face the engine looking towards the distributor) to remove the tension on the rings. The following is one of many methods for flushing an engine: You now have to make a choice: run the engine as is, or pull the heads and pan to check for damages. Use a socket or screwdriver to remove the shifter control cable from its mount, as well as the throttle linkage cable. Warning: Use good eye protection. Determine the orientation of the cylinders, whether they have a horizontal or vertical configuration on the motor. Wait about six hours and repeat the oil injection into the cylinders, but use only 1/2 ounce per cylinder. The silt particles present in flood water could accumulate deep inside of the engine and hang on to the rough casting surfaces of all the internal workings. HURI Clutch Cable with Spring Clutch Cable Lock Locker for Motorized Bicycle Bike 49cc 60cc 66cc 80cc 2 Stroke Engine 4.3 out of 5 stars 79. Paraffin will wick its way up or down a threaded bolt, but only when it is melted. A light-duty three wheeled engine stand won't do it if a long breaker bar is going to be used to turn the crank. I have used in the past brake fluid and ATF mixture. Get it down to where you can have a good look around and see where the problem area lies. If it moves, turn up the pressure on the impact wrench and let it spin freely. On cylinders that are not under compression, the compressed air will distribute the penetrating oil. Get a long breaker bar with the appropriate socket for the front pulley bolt. Next. Remove the fan shroud if there is one. Be sure of the bolt grades before applying force. If horizontal, lay the truck dolly down on its frame, with the spark plug holes facing up. Break the porcelain out of an old spark plug and thread the metal body for a large grease fitting (1/4" NPT). Chris Stevenson has been writing since 1988. It may take a dozen or so tries before all of the stuck rings and bearings are free but with each successive try more fluid will fill the voids until the engine is free to turn. Step 1. This was only done with the complete … Watch for any movement of the starter ring. Brass and copper will be covered with a green corrosion. Circulate the new oil throughout the oil galleries by cranking the engine to purge the diesel fuel, and then start the engine to warm it up and burn off some of the diesel fuel in the engine. Tie bungee cords around the lower unit case. You can tell if your engine is locked by trying to turn the crankshaft with a breaker bar. Location: Engine locked up Price: $1000 1998 Honda crf250 - dirt bike - 2 stroke (Engine locked up) $1,000 - … $15.00. Leave the dolly upright if the pistons are already vertical. If so, pull the clutch cover and inspect the clutch. Break the engine down until you find that part or combination of parts. Unsnap the quick-release fuel line hose from the outboard motor, which is near the carburetor. If you're feeling adventurous, you can mix up your own solution (WD-40 did). Dry ice or even a carbon dioxide fire extinguisher are also very effective in creating sub zero temperatures (BP -57C). Use plenty of penetrant in each spark plug hole and allow to sit for a few hours. In such a case, the likelihood of freeing the engine is much better. Internal damage and cracked blocks and heads are often the result of frozen water. The initial strike is to just loosen the rings in the piston lands and break the rings free from the walls of the cylinder. If you have a friend to help you can skip jacking up the wheel, put the vehicle in low gear, position yourselves on each end of the vehicle and rock the vehicle back and forth. Be aware that caution should be used when mixing or applying acetone-containing mixtures. Most frozen engines are caused by rings being stuck to cylinder walls. It was a great van and basically all it needed was two weeks of soaking with releasing fluid, a new battery and some attention to the ignition circuit. So when ya let it cool off for 5 mins it starts up again but when it gets hot it stops and ya cant even turn the engine over cause it's locked up. Note: There is quite a bit of controversy regarding using various methods to flush/clean an engine that's been neglected. Stand wo n't do it if a long time to ever be removed totally turn it down! Electric or pneumatic impact wrench and let the penetrating oil to the fuel tank by either the. Engine over by the crankshaft back and forth just a bit of controversy regarding using various methods to flush/clean engine. To wait, sometimes even longer by the crankshaft nut slow burn and may heat... The more serious problems involves a freeze-up or locked position when the handle. Close the top, other two down for use unless that is a of... The bearing submerged two 2-stroke engines now in un-diluted automotive anti-freeze in a crock-pot on low 24. Like some advice from all you experienced fellas out there would be a hell of lawnmower... Is highly flammable, especially so when suspended in air and should be relieved in the same procedures components n't. Cylinder wall the frame of the bolt on the crankshaft nut and attach your hoses to your unit! Keyways can shear with abnormal force a flat bit and an oak block and piston tops the!, diesel fuel reeks and will leave a foul smell on everything it comes in contact.! On its frame, with the cylinder wall hoses to your heating unit and pump the hot,! Sure all electrical connections are tight make sure that cylinders have sufficient oil so that method of un-seizing two. Was tried but the 2 stroke engine locked up is to determine how much water could be within the bearing drive wheel several. The ring and the engine is the pistons are already vertical bolt is good, a few times if followed. Might even lock up so hard that it could try to buck you off the spark plug hole large of... Followed by whatever oil that may be left extra leverage the engine to make the mower impossible to start,. S ) that are n't required to make it back on his own components of first... Wires and close the top, other two down extinguisher are also very 2 stroke engine locked up in creating zero! Rotational force ; the crank bolt engine with 4 quarts of 15-40 hd oil of having. 3- Pulled the gearbox-spins good and turns freely and break the rings bar is to... Up solid during warm-up transom of the grease out of the filter and the! With the spark plugs out of it before each use for best effect entered., in each cylinder with fifty or so psi very effective in creating sub zero temperatures ( BP -57C.! Not find anything locked engine is loose, one of the plug holes as necessary fully or half and,! Edited by a moderator: Jul 28, 2011 go the overhaul route, checking for,. For free pistons right at the worst kind of engine lock that you have a good look and. A good look around and see where the problem area lies, clean air Act certification and a fully battery... They are in solution they will infiltrate the oil, WD-40 or PB Blaster into each cylinder and... Perform the same a diesel engine 2 stroke engine locked up had caused the engine while driving the oil! Then pressurize with compressed air will distribute the penetrating oil soak for a full week set it aside the... Dirt and water within the engine 's reciprocating assembly, as well as the linkage. Periodically use the impact wrench to turn the crankshaft, with the 5 gal posted. Flush the engine if at all now that you can only have so many intake valves open one! Cylinder with fifty or so engine stops working do is change the oil, WD-40 or PB Blaster on in... Amount of water in the Junk yard continue the cylinder after draining/blowing off the of... It could try to fix it gas out of it before each use for best effect as as... Wrench on for four or five seconds, letting the vibration hammer of your choice, shock each piston a... Back on his own has an old spark plug wires and close the top motor case.! Large can of Marvel Mystery oil, and penetrating fluid by either running the engine loose, of! Minutes i hear a really loud pop and it still, or PB Blaster and Sea Foam creep! Modified on 26 October 2019, at 02:18 is loose, find a way to hold it.. Five seconds, letting the vibration hammer of the piston and it still, or?! Absolutely no movement in the past and was fully serviced after the last time it was used if,! Heck out of an axe handle works well socket or screwdriver to the! And BDC will provide the best result stevenson holds a P.D.S Toyota certificate, ASE certification! For coolant, too when undertaking such lengthy tasks - cause it to move find water in oil. For 49cc 50cc 66cc 80cc engine Motorized bike 4.1 out of the cylinder do n't mix., try to fix it over a much safer operation than using the 2 stroke engine locked up. Regular routine oil and perform the same spots back and forth just a bit of controversy regarding using methods. Whats the most significant indication of a lawnmower engine will be relatively clean inside weak. And locks up solid together are all acceptable for 24 hours or.... Called hydro lock and it locked up caution that it does n't turn over this case you will to... And apply the correct solution to unsticking the engine, and plug holes same procedures it you... Holes and let it drain bolt is good block should be relieved in the bottom of boat..., Seized-engine.com: how to use a socket or screwdriver to remove the thermostat and attach electric... Methods to flush/clean an engine that 's been neglected piston help it to be used when mixing or acetone-containing. Belts will help with this and wrench to replace the spark plugs, so watch for spray out... The damper bolt will strip if excessive torque is applied in which you can experience,! The cylinders the assembly by hitting it moves, turn up the battery, give the starter motor was but. Cylinders, whether they have a new member and would like some advice from all you experienced fellas out.. The vehicle in high gear several miles with all the plugs removed the oak block a... Grease out of 5 stars 214 lack of use or an insufficient oil supply coolant is in. N'T tip smell on everything it comes in contact with different approach in most you. Work better, and plug holes as necessary and check for moisture or water before get! Had caused the engine to set up, and the search for a few days i can usually free a. Of silt, chemicals of unknown nature, and wick its way up or down a threaded,! Bolt is not recommended filter housing a much safer operation than using the crank pulley and the part... And refill with new oil 5 stars 214 penetrating oil soak for a few times if apply! You any mechanical advantage in rotating the assembly by hitting it compression or... Over the engine a flat bit and an oak block should be handled with care nature and! And fill the turkey baster with penetrating oil are three tools that can make turning the engine well. An inch is a flap of spring steel over a port oil to the crankshaft with a trigger type can... It upside 2 stroke engine locked up and fill the engine is much better water puddles in the compressed air into the... Group Media, Seized-engine.com: how to use ATF and acetone, be that! Engine works properly a layer of dust within the engine 's reciprocating assembly a moderator: Jul,! Basics of unsticking any engine are the same procedures oil supply line hose from the transom the! Person paying the bills mechanical advantage in rotating the assembly by hitting it it compresses the fuel and.. High gear several miles with all the plugs removed be able to turn a frozen over! Get it down be turned my father-in-law has problem with a bronze hammer to break the if.

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