44
Standard
Service limit
0.02-0.07 mm
0.07 mm
e) Closed gap of piston ring
Put piston ring horizontally into the cylinder,
push the ring to working position with piston
head, and then measure its opening clearance
by thickness gauge. This clearance shall be
neither too great, nor too small. Too great
clearance may make that cylinder sealing
performance gets bad, too small will cause
the piston ring to be stuck in the cylinder due
to thermal expansion during operation,
causing that the piston ring is broken or even
"cylinder scraping". Ring opening clearance
is small, the opening can be filed by thin flat
file. It shall be placed into the cylinder for
inspection while filing, until the clearance is
proper.
Standard
Service limit
0-0.06 mm
0.06 mm
④
Inspection of connecting rod
When connecting rod is bent or twisted, or
there is serious groove in big end hole or
small end hole, or there is a crack on one
side, it shall be scrapped and replaced with
new ones.
a) Test the diameter of small end
Piston
ring
