Subaru Robin EA190V - Manual (Page 46)

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e) Piston ring end gap
Flatly place the piston into the cylinder with pushing the piston head to
working position. Measure the opening clearance with feeler, that
clearance should not be too big or not too small, being too big can result
in poor cylinder sealing performance while being too small can result in
piston expansion from heating and cylinder block, thus causing piston
broken and “sticking”. If opening clearance is too small, file the opening
with fine flat file. Check in the cylinder often when filing until the proper
clearance is got.
③ Check connecting rod
If connecting rod bending, twisting or big end shaft bush and small end outer ring movement or crack on
one side, should be rejected and replaced with new one.
a) Check small end diameter
If out of the standard or exceed service limit, replace the connecting rod.
b) Check big end diameter
If out of the standard or exceed service limit, replace the connecting rod.
Standard (The first ring/second ring) Service limit
0.04～0.08/0.04～0.08mm 0.150mm
Standard Service limit
The first ring 0.13-0.28mm 1.0mm
The second ring 0.20-0.40mm 1.0mm
Standard Service limit
16.005-16.021mm 16.090mm
Standard Service limit
30.000-30.018mm 30.066mm
Piston ring
Feeler