Freeing a stuck engine

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 #Don't forget to use horizontal force on the crankshaft. Tap the crankshaft at both ends with your dead blow hammer and oak block. Loosen off the rod bearings and tap with a bronze hammer to break the shell bearings loose.
 #After you've done all of the above, let 'er soak and then start over again. She'll loosen!
+# Here's a trick I have used on motorcycle engines but am sure would work on any piston engine. After trying the forementioned 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. Blow in the hose, if you can't easily then you have the one on compression storke (if you use a gauge hose make sure it has no schrader valve in it). Break the porcelain out of an old spark plug and thread the metal body for a large grease fitting (1/4 NPT). Insert the plug in the compression cylinder and pump it full using a grease gun filled with cheap light weight grease (like white grease). Grease guns can develop thousands of pounds of pressure with no impact. Once the motor breaks free you can rotate the motor to squeeze most of the grease out of the spark plug hole.
 ==Unsticking an engine in a manual transmission vehicle==
 Success can be attained in unsticking an engine in vehicles equipped with a manual transmission on a number of occasions by using the pre-soaking methods mentioned above for a long period.

Revision as of 23:49, 21 January 2009