Re: In-Car Rebuild

Posted by longjohn On 2020/7/18 0:32:50

You may be making too big a project out of this. A complete rebuild may not be needed (unless you are a perfectionist)

Looking at your compression numbers, it seems that you only have a problem with #6 and #8. #6 appears to a valve problem and even it isn't bad. #8 appears to be a a ring.

I would pull the head and see what you find. I once had a similar low reading in only one cylinder. Upon inspection, I found a cracked piston. I only replaced the one piston and rings. I replaced the piston with the engine in the car. That was 30,000 miles ago and the engine is still running strong.

You may just need to re-ring the one cylinder. And maybe hone the valves. You just don't know until you pull the head.

#3 cylinder is a real puzzler. I don't think that I've ever seen compression this high in a straight 8 Packard.