Linhai ATV 500-D T3 EFI Service Manual page 101

CHAPTER 3 ENGINE
Piston
Piston Diameter
Use a micrometer to measure the diameter at the
point 10mm above the piston end, as illustrated on
the right. If the measurement is less that the limit,
replace the piston
Standard: 87.460-87.480mm
Limit: 87.380mm
Tool: Micrometer (75-100mm)
Calculate the piston to cylinder clearance according
to the above measurement.
If the clearance is more than 0.15mm, replace the
cylinder or piston, or both.
Piston Ring to Groove Clearance
Use a thickness gauge to measure the side
clearance of top ring and 2
t
If the clearance exceeds the limit, replace both
piston and piston rings.
Service Limit:
Top ring: 0.18mm
2 ring: 0.15mm
nd
Standard width of piston ring groove
Top ring: 1.03-1.05mm
2 ring: 1.22-1.24mm
nd
Oil ring: 2.51-2.53mm
Standard thickness of piston ring
Top ring: 0.970-0.990mm
2 ring: 1.170-1.190mm
nd
Tools: Thickness gauge
Micrometer (0-25mm)
ring.
nd
LH500ATV-D T3 EFI SERVICE MANUA 19.0
CHAPTER 3 ENGINE PAGE. 3- 68