i watched someone free up a stuck engine with a grease gun . after trying various ways to turn it with penetrating oil in the plug holes they let it soak over night . next day they checked the rocker arms to determine which cylinder was coming up on compression . next they used a grease gun to fill the combustion chamber with grease . they then broke the insulator out of a spark plug and welded a pipe coupling in the spark plug . next put a zerk fitting in the coupling and connected the grease gun and pumped . after some pressure build up the engine broke free . this was done with all plugs out . after being able to turn the engine completely over they used the starter to further loosen the motor . next they started the engine with NO PLUG in the cylinder with the grease . grease flew every where . i don't remember what engine it was but was a big 8 cyl. truck engine .
- Thread starter bill b va
- Start date
rustyfarmall
Well-known Member
An engine in a truck will never become as stuck as an engine in a tractor with vertical exhaust. Not even close.
Steve@Advance
Well-known Member
I've heard of that procedure before.
It would work if...
The engine were not severely stuck.
The chosen piston were preferably around the 90* area of the stroke.
And the operator of the grease gun knew when to quit!
Problem is, a hand lever type grease gun is capable of 15,000 PSI! On a 3" bore cylinder, that equals to about 105,000 lbs of force, or 52 1/2 tons!
So, the potential for destruction is easy to see, bent rod, twisted/broken crank, broken/stretched main cap or bolts, crushed piston, split liner or block, snapped head bolts. Not sure which would give first...
Another factor, all of this force would be exerted on one cylinder. Were the engine being forcibly turned, at least the stuck cylinders would be sharing the force.
I still think, IMHO, if it cant be broken loose by soaking with oil, banging the starter, or prying on the flywheel, it's best to take it apart in the least destructive way possible.
It would work if...
The engine were not severely stuck.
The chosen piston were preferably around the 90* area of the stroke.
And the operator of the grease gun knew when to quit!
Problem is, a hand lever type grease gun is capable of 15,000 PSI! On a 3" bore cylinder, that equals to about 105,000 lbs of force, or 52 1/2 tons!
So, the potential for destruction is easy to see, bent rod, twisted/broken crank, broken/stretched main cap or bolts, crushed piston, split liner or block, snapped head bolts. Not sure which would give first...
Another factor, all of this force would be exerted on one cylinder. Were the engine being forcibly turned, at least the stuck cylinders would be sharing the force.
I still think, IMHO, if it cant be broken loose by soaking with oil, banging the starter, or prying on the flywheel, it's best to take it apart in the least destructive way possible.
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