Piston And Piston Rings Removal; Cylinder Inspection - Linhai HY740STL 2018 Service Manual

CHAPTER 3 ENGINE
PISTON AND
REMOVAL
1. Remove:
⚫Piston pin clip 
⚫Piston pin 
⚫Piston 
NOTE:
Before removing the piston pin clip, cover
the crankcase opening with a clean towel
or rag to prevent the clip from falling into
the crankcase cavity.
2. Remove:
⚫Top ring
⚫2nd ring
⚫Oil ring
NOTE:
When removing the piston ring, open the
end gap of the ring by fingers, and push up
the other side of the ring.

CYLINDER INSPECTION

1. Measure:
⚫Cylinder bore
Out of specification → Rebore or replace.
NOTE:
⚫Measure the cylinder bore with a cylinder
bore gauge.
⚫Measure the cylinder bore in parallel to
and a right angle to the crankshaft. Then,
find the average of the measurements.
Cylinder bore:
102.000- 102.015 mm
< Limit: 102.05 mm>
< Difference limit between A,B
and C :0.03m m >
2. Measure:
⚫Warpage
Out of specification → Replace.
Cylinder warpage limit:
PISTON RINGS
0.03mm
M750L SERVICE MANUAL 18.0
CHAPTER 3 ENGINE PAGE 3- 39