Even a degree of movement or a thousandths of an inch is a start in moving the engine's reciprocating assembly. 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. Tie bungee cords around the lower unit case. In doing so the engine is nicely locked up. Therefore, you could only have two or three stuck pistons at the worst, not all of them. There are two places in which you can apply rotational force; the crank pulley and the flywheel. For example the writer was privileged to be shown a seized vintage oil engine that was about a hundred years old. Beyond that, there may be no damage done. Start by turning the crank, even a small amount will - over time and with repetition - cause it to break loose. Fuel Tank Filter. Last edited by a moderator: Jul 28, 2011. You'll be turning it over without spark plugs, so watch for spray coming out of the plug holes. Allow time for the penetrant to work and don't get impatient. Hey guys, I have a 2003 Sea doo that I just accumulated through family for free. Continue the cylinder spray alternating PB blaster and Sea Foam Deep creep. Mine moved about 1/8". Afterward, let the penetrating oil soak for a full week. Fill the turkey baster with penetrating oil, and then inject 1/2 to 1 ounce of oil into each cylinder. The fuel mixture can be pulled through it into the crankcase, but the valve closes when the pressure in the crankcase rises as the piston is on the downward stroke. Fortunately the defective alloy part had been discontinued and replaced with a steel part so the new part was bought and fitted. This will allow the excess penetration oil to evacuate itself from the combustion chambers and for some of the oil in the crankcase to move in the system. I figure i have 3 options. Dad said he thinks the crank bearing went out or the piston broke. A two-stroke (or two-cycle) engine is a type of internal combustion engine that completes a power cycle with two strokes (up and down movements) of the piston during only one crankshaft revolution. You can cycle through a few times if you want. 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 no coolant is present in the upper tank, open the drain tap and check for the presence of antifreeze. This was only done with the complete … The internal parts of a lawnmower engine will seize from lack of use or an insufficient oil supply. Use a socket and wrench to remove the spark plug (or plugs). It can take several oil changes to bring the engine back to a state where the oil and filter isn't immediately contaminated with the loosened dirt. 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.). 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 way is to use a homemade oil burner water heater system with a pump. Fill cylinders again and reinsert plugs. In some cases, you can open an engine block tap or remove a water jacket stud to look for coolant, too. He ignored the idiot horn and instead in getting towed back home tried to make it back on his own. Be sure to lubricate after draining/blowing off the antifreeze. 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. Just click the "edit" tab at the top of this page, or click one of the  links to the right of an article section. It's time consuming and may be a bit of work, but the object is to SAVE the 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. Would hitting a stuck piston help it to move? Do not use pulleys or the outside ring of balancers to turn over the engine if at all possible. Most importantly: 1. Warning: Use good eye protection. If the engine seems to have locked up remove the spark plug holes and squirt or pour some releasing fluid like Plus Gas or diesel fuel in the plug holes trying to get as much as possible on the cylinder walls. 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. Step 1. So, out came the engine, and the search for a Wrench Rabbit complete two-stroke rebuild kit started. That means that you can loosen the belts or remove the alternator, water pump, intake and exhaust manifolds, distributor, heads, oil pan, etc. 3- Pulled the gearbox-spins good and crank gear is good. The dust will wick up the oil from the surface and water vapor from the air will start to rust the steel surface over time. You need something that will penetrate, stay wet, and wick its way up into the smallest area. Remove or loosen any accessories that may be frozen up and causing the engine to be harder to turn over. Be sure of the bolt grades before applying force. 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). If you apply enough force in the proper direction, yes it would help. These particles are so small that when they are in solution they will infiltrate the oil clearance of a bearing. I generally coat the cylinders each day and try to turn engine. Unsnap the top motor cowl case and pull the plug wires off the spark plugs. If you're feeling adventurous, you can mix up your own solution (WD-40 did). Ordinary motor oil will coat but penetrates at a very slow pace. Get some help if you think you need it. Pull the dipstick and check for water in the engine oil. A new heavy duty battery was purchased and this succeeded in freeing the engine on the third impact (the current draw was so high that the earth braid smoked!) 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. Oxidation of the internal components of the engine will make the mower impossible to start. This can take quite a while and it is quite tiring but you will notice the wheel will start to move a little farther if the process is going to succeed. If it's the frame of the car or truck, that's good. Many years ago the writer bought a Commer van with a stuck engine. If horizontal, lay the truck dolly down on its frame, with the spark plug holes facing up. Seized engines can also result from spun rod or crankshaft bearings. If the motor refuses to turn, add more penetrating oil and periodically use the impact wrench to turn the crankshaft nut. Loosen the rod bearing caps and tap with a bronze hammer to break the bearings loose. My father-in-law has problem with a 2000 model Mercury 50hp motor two stroke. 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? Once the engine has soaked, jack up one drive wheel, put the transmission in high gear and work the wheel back and forth. For that reason, diesel fuel is not recommended for use unless that is all that's available. 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. Tap the crankshaft at both ends with your dead blow hammer and oak block, like you were going to measure the crank end float. If these engines are gotten to before such damage occurs, it may be possible to salvage them intact. Locked-up motors result from long periods of storage, worn components or insufficient lubrication. We do know that when these oxides dry out they are usually hard to remove by any means other than mechanical (sanding or wire brush/wheel, sand/bead blasting). The reason that you are looking for moisture is to determine how much water could be within the engine. Watch for any movement of the starter ring. Crank keys and keyways can shear with abnormal force. 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. Could we have just dropped a valve on the piston and it's stuck there? The better way to approach this when you have a stuck engine would be this way: After trying the aforementioned soaking to no avail, determine which cylinder is on the compression stroke by removing the spark plugs and using a compression gauge hose or other hose that fits snugly in the spark plug hole. 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. Transport the motor inside a garage area. DO NOT use gasoline or other highly flammable solvents as they do not provide any lubricity, plus they are a respiratory and fire hazard. Another approach is to put some Marvel Mystery Oil, WD-40 or PB Blaster into each cylinder and then pressurize with compressed air. If you're going to do a compression test or a leakdown test, drain and refill with new oil. Refill with clean motor oil and install a new filter. 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. 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 so, pull the clutch cover and inspect the clutch. Good luck and the hardest part, HAVE PATIENCE. From underneath everything looks good. You can start by pulling the spark plugs out and inject penetrating oil with a trigger type oil can. What condition was the engine left in when last turned over, is there oil in it still, or water? If the engine is loose, find a way to hold it down. 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