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Perkins 246 Diesel Ring Gap

2

21hunter

Member
I'm assembling my engine with new components. The book specifies .018- .022 gap for the top ring and .014- .019 for all other rings. The top rings are good with around .020. The other compression rings are about the same which puts them slightly out of spec but I suppose I can live that. What concerns me (not much) is that The oil rings are running around .012-.013 which makes the a tad tight. The rule of thumb is .003- .004 per inch of bore so the minimum should be 3.875 x .003 = .0116 That would mean I'm OK. Perkins likely figured the ring gaps with an engine running at full power in high heat conditions. This tractor will have a relativity easy life. So am I worrying too much?
Thanks
 
Put it together. Funny comment used to hear in the speed shop I worked at years ago in the engine build room, gas the biatch, they will never see it from the stands..
 
Okay, now that I'm being a worry wart.....what about rod bolts? My new rod bolts with nuts weigh 3.70 oz or 104 Gram. The old ones weigh 4.10 or or 117 gram. Perkins went to the trouble of grading the con rod weights...11,12 or 13. Use the old rod bolts and nuts or not? Ok so it's not a Super Stock pulling tractor or NASCAR engine but would it be best to keep the balance? What's the chances of the old bolts failing if they look good?
 
Just weighed the old piston and ring package versus new. Old is 1310 G. New is 1264 g. So with the lighter new rod bolts and nuts we're still 33 G heavier than the old assembly. It is 46 G heavier on the reciprocating part and 13 G lighter on the rotating part. Not sure how this will effect balance but likely don't matter much for 2160 RPM engine.
 
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