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Join Date: Aug 2014
Location: Europe
Posts: 322
Further to my reply/question above (still need help with that)

Tech specs below (for next three questions)

----- Piston Ring Side Clearance ----

There is a wear limit specified for piston ring side clearance of 0.2mm (.0078"), and a piston ring side clearance. With a NEW ring in a used (clean) piston, say #1 ring, the clearance is .075mm to .107mm (.0029" to .0042").

Q1) So is the piston junk with a new ring, if the side clearance is more than .0042", even though the wear limit is 0.0078"? Assuming that the new rings are within the specs below for thickness

Q2) When do you use the wear limit? I.e with a new ring if you cant achieve .002" to 0.004" then its okay to exceed 0.004" provided that it cannot exceed 0.0078" when HOT, even though it would be difficult to measure that. Same for ring end gaps, below (next question). Wear limit is 0.1mm (0.040")


I know about the other measurements on the piston/cylinders, I just want to investigate the ring clearances first.

---- Piston Ring End Gap ----

Q3) The piston ring end gap (new ring, good cylinder, inserted and measured near bottom of cylinder), should be .15mm to .45mm (.006" to .012")?

Old 06-07-2018, 07:30 AM
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