Stuck Rings?

[Jon Miller]

I think that I've got Comp Cam lifters, but I bought them about 8 years ago... A quick post WD-40 compression check with my $5 gauge showed a high of 170 PSI on a couple of cylinders, down to a low of 40 and 25 PSI on numbers 7 and 8.

I did try the I-talian tune up just for fun, but I think I'm in for a tear down Monday after work. This thing is still fast even on 6 cylinders, I can hardly wait to see what it's like on all 8! I'll do one more compression test prior to turning bolts to the left, but I'm guessing that there are new rings in my future.....

Thanks,
Jon

[SantaFe66]

I agree with "Slick" on the Marvel Mystery oil. I've used it on numerous motorcycles I've purchased that, for all intents and purposes, were locked up tight from not having been run for years and stored outside, behind the shed.

You squirt it in each cylinder and let it sit for a week. Careful pressure on the crank with a breaker (that's if it is totally frozen) and it will eventually yield. I've recovered full ring seal after running the motorcycle for a couple hours after the MMO treatment.

This was recommended by a professional drag racing motocycle engine builder and it has worked for me on 3 frozen motors. Don't know why it works, but it does. WD40 may indeed work but it's a solvent as well as a lubricant and if it isn't recommended for guns, why would it work on motors? MMO can be used as a top cylinder lubricant through the carb so it's a better choice, in my opinion.

Paul