Re: Locked motor
I had gas leak in cylinder after storage, 427/425 bent a rod with the starter! Easy to check
I had gas leak in cylinder after storage, 427/425 bent a rod with the starter! Easy to check
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Re: Locked motor
Someone did a scientific test on all products for loosening rusted/frozen items and the winner hands down was a mixture of 50% ATF/ 50% acetone. I've tried it and it works better than anything I've used prior. That includes MMO, PB Blaster etc. Try it, it really works.Comment
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Current Corvettes owned 1957 two top stealth 383 dual quads--1965 original low mileage 300 h.p. coupe.
Other Corvettes owned over the years:
1954. 1957 AIRBOX FI. Two 1958s one FI, One 2x4. 1961. 1964 convertible A/C auto trans. Two 1965s one coupe with 300 h.p. loaded A/C car, one 365 h.p. convertible Two 1966s one loaded A/C, BB coupe one loaded A/C, SB coupe. Two 1968s one BB convert, 1969 BB coupe. 1971. 1973. 1978 L-82. 1985, 1986 both 4+3s.Comment
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Re: Locked motor
For what it's worth I have used compressed air in the spark plug hole of a piston that had both valves closed. The PSI of a 4"+ piston will be greater than wrenching the bolt. Just don't put a wrench on the bolt if you use air. The PSI of the air will multiply with the SQ " area of the piston and will be far greater than 500 lbs on the top. This will not damage anything as the combustion is somewhere around 2,000 PSI pushing the piston down when the engine is running.
DomComment
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Re: Locked motor
snap-on make a tool that utilizes the teeth on the flywheel to turn the engine. mikeComment
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Re: Locked motor
Make sure that none of the belts are frozen to the pullies. A friend of mine just went through this with a Chevel with a 396 that was left outside for more than 5 years. He did the MMO trick and could not turn the engine. He then discovered that the alternator was seized and the belt stuck to it. He cut the belt and the engine turned over.Comment
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Re: Locked motor
I think Dom has the right idea. 100 psi on the piston is a lot of force without using a wrench.Comment
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Re: Locked motor
Frank------
A lot depends upon how long this engine has been out-of-service and what the conditions of its storage have been. A problem can occur with engines that have been out-of-service for a very long time and in a wet or humid environment. The cylinder walls are, of course, iron, the piston rings steel and cast iron, and the pistons aluminum. Once all of the oil is gone from the internal parts and if any moisture is present, dis-similar metal corrosion occurs. I've seen at least one engine that suffered from this for which the pistons could not be removed with a sledge hammer. I hope your problem is not that severe.In Appreciation of John HinckleyComment
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