Shibaura SG280E, Workshop Manual

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24
3) Replace piston rings if they show signs of wear or
damage.
Insert the ring in the diameter of the skirt of the
cylinder with the least wear, and then measure
the clearance at the opening. Replace the piston
ring if the value exceeds the usage limit.
Engine model N843
Assembly
standard
0.20 to 0.35
Ring #1
Usage limit 1.0 or more
Assembly
standard
0.20 to 0.40
Ring #2
Usage limit 1.0 or more
Assembly
standard
0.20 to 0.40
Oil ring
Usage limit 1.0 or more
4) Measure the clearance between the piston ring
groove and the ring. Replace the piston ring if the
value exceeds the usage limit.
Engine model N843
Assembly standard 0.07 to 0.11
Ring #1
Usage limit 0.25 or more
Assembly standard 0.04 to 0.08
Ring #2
Usage limit 0.25 or more
Assembly standard 0.02 to 0.06
Oil ring
Usage limit 0.15 or more
Fig.2-5-16
Fig.2-5-1