Posted by RAB on August 02, 2009 at 14:06:24 from (195.93.21.10):
In Reply to: Engine rebuild? posted by Bill in IL on August 02, 2009 at 07:00:10:
Some good info below but perhaps something here might help.
If no internal micrometer, check ring gap in the worn part of bore and at the bottom in the unworn part. The ring gap difference can be worked back to bore wear.
If the cylinders are oval, new rings will struggle to seat.
Side clearance of rings, particularly in the top groove is important. Rings may well 'oil pump' if sloppy. Pistons can be reconditioned for this fault but probably the cost and other wear factors would make it uneconomical.
Look at the bore with a light from the other end. You will see if the reflection is distorted (oval bores).
Some top rings can be obtained (or perhaps not, these days) with a step to avoid the ridge problem.
The workshop manual or a generic manual will give the serviceable limits for the engine.
You said 'Where else could all this blow by be coming from?'
Well, was the timing too far advanced? Has the head been shaved previously (raised compression ratio), Higher compression pistons fitted? Rings sticking in piston grooves?
Actually sounds like it is worn to some extent, probably oval. For you to check out. For you to decide how far to go. My view is - if you can get the parts, do the job properly, unless just a parade tractor.
Fixing the blow-by may well mean sorting the crank, as extra load imposed by a strong engine may well find any weakness in the lubrication system and bottom end bearings, if worked hard.
As is often said 'do it properly;only do it once'.
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