Thread: lost of compression on rebuilt engine, need help

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The only time I've ever heard of an engine COMPLETELY losing compression like this is when the assembler didn't offset the rings when they were putting the motor together. You can't align the ring gaps because making a complete circle out of the compression rings is what gives your motor its compression. This could be especially true if all the cylinders are suffering like this because if a builder puts 1 piston and ring set in wrong, they will probably put them all in wrong.

What he said but check your timing gears and chain for proper alignment

I think the guys have hit it. If you put oil in the cylinders and compression did not come up, it is probably your valves not seating. Either timing is off, or they are not closing when they should for some reason.

Don