Discussion in 'Rotating Assemblies' started by PrefixAM, Nov 27, 2018.
having a decent set of piston ring compressors available in your tool box helps
make engine assembly far easier, using the type posted above makes the job rather easy
using the type below could make a preacher cuss up a blue streak
the #$%%^^& things are just prone to allowing rings too catch and potentially break, as they enter the bore, yeah they work at times but they are not nearly as easy or foolproof
I was recently over at a buddies house/garage where he was pulling apart a recently rebuild engine that had a serious oil burning issue,
I originally expected to defective valve seals or worn valve guides but neither was the case
the indications strongly indicated ring seal failure, so we checked carefully,
the engine had brand new total seal rings installed,
and he swears he very carefully verified ring gaps.
before he had installed them on the pistons
what we found was that the rings may have been very correctly gapped but the pistons he had re-used in the build,
had about an 8 thousands clearance with the bore wall.
now to be fair this guy has very few tools and hes rather new to measuring and engine rebuilding.
he had simply removed the original pistons
honed the bore walls and installed new rings on the pistons, then reassembled and the rings never properly sealed.
one other reason I found that was a major factor was three of the top/upper rings were also installed with the wrong side facing up.
(yeah we all tend to learn the hard way at times)
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