Linhai HY740STL 2018, Service Manual

Page: 72 / 217

CHAPTER 3 ENGINE
M750L SERVICE MANUAL 18.0
CHAPTER 3 ENGINE PAGE 3-
41
PISTON RINGS INSPECTION
1. Measure:
⚫
Side clearance
○
,
1
Out of specification
→
Replace the piston
and the piston rings as a set.
NOTE:
Eliminate the carbon deposits from the piston
ring grooves and rings before measuring the
side clearance.
Side clearance (piston ring):
Top ring:
<Limit: 0.18mm>
2nd ring:
0.02 - 0.06mm
<Limit: 0.15mm>
2.Position:
⚫
Piston ring into the cylinder
NOTE :
Push the ring with the piston crown so that the
ring will be at a right angle to the cylinder
bore.
○
,
1
5.0mm
3. Measure:
⚫
End gap
⚫
Out of specification
→
Replace.
NOTE:
You cannot measure the end gap on the
expander spacer of the oil ring. If the oil ring
rails show excessive gap, replace all three
rings.
End gap:
Top ring:
0.20-0.40mm
<Limit:0.55mm>
2nd ring:
0.20-0.40mm
<Limit:0.55m m>
Oil ring:
0.20-0.70mm
<Limit:0.90m m>