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  1. #1

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    The gentle way to loosen stuck pistons!

    Take a spark plug and remove the ceramic part and electrode.
    Solder a grease nipple to the spark plug base.
    Skrew the device into the cylinder head, then use a grease gun to slowly release the piston.
    Take your time and let the grease have time to its job!
    Good luck Mike

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    Jon (04-20-2017)

  3. #2

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    i always filled cylinders with kerosene, let set overnight or longer then take a breaker-bar and deep well socket to the crankshaft pulley bolt an d rock it back and forth. i don't force it just apply a little pressure one way then back the other. if it moves any at all i stop and add motoroil to the cylinders , let set overnight again. this may be a slow process as all the cylinders must make a clean pass. i usually turn over by wrench until my shoulders' are about to fall off. just to make sure nothing is broken inside. then with the plugs out i crank the engine over to get most of the kero-oil mix out . replace plugs and fire up.

  4. #3

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    I have always used a method similar to cuyler1's. The only real difference is that I use Marvel Mystery Oil, pour it in liberally through the spark plug hole, then replace the plug and let it sit for at least 24 hours before trying to turn the crank....gently, at first, using a back-and-forth motion. Once you feel the rings break loose, you should be able to feel whether it's somehow still bound up, but I've never had this stuff fail me completely! Good luck.

  5. #4

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    if this is an engine or vehicle you plan to keep then plan on a rebuild. 50 years of experience building,racing and hiding from the wife under a car. the "original" man cave dweller here!

  6. #5
    Frank S's Avatar
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    The a fore mentioned methods are tried and proven by many. However the pistons are not the only components which may cause an engine to be frozen in place.
    the valve camshafts crank shaft bearings and even the lowly distributor or magneto are a few of the others. on small engines that have an alternator built right into the flywheel the magnets can become dislodged. Some small engines have counter rotating balance shafts which can drop a tooth from their gears. On motorcycle engines particularly those with chain driven overhead cams I've seen them drop chunks off of the chain guides which become lodged in the links of the chain and the sprocket on the crankshaft. These are some of the reasons to check everything before deciding on which procedure would best solve the situation.
    Never try to tell me it can't be done
    When I have to paint I use http://kbs.justoldtrucks.com/

  7. #6
    [email protected] tonyfoale's Avatar
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    Quote Originally Posted by cuyler1 View Post
    if this is an engine or vehicle you plan to keep then plan on a rebuild.
    That would be my approach. If it is stuck then there is likely to be a reason that can't or shouldn't be fixed by external means.
    BTW. where do you guys get all these stuck engines from?

  8. #7

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    Definitely an interesting tip/trick. Thanks. Although I have never had a fully seized engine i wanted to rescue, I have been partial to a 50/25/25 mix of acetone, atf and Seafoam (or Marvel's), in attempt to loosen stuck rings and carbon build up. Approx. 1/8 cup each cylinder and 1 to 3 days wait has helped me greatly. i can see how your grease gun approach may benefit, but i also would opt for using a spark-plug hole adapter to pressurize the cylinder after all pistons and rings have soaked.


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