Linhai ATV 500-D T3 EFI Service Manual page 95

CHAPTER 3 ENGINE
Valve Spring
Valve Spring keeps valve and valve seat tight.
Weakened spring results in reduced engine power
output and chattering noise from valve mechanism.
Measure the spring free length.
Spring free length out of range: →Replace
Service Limit: 38.8mm
Tool: Vernier Caliper.
Measure the force to compress the spring to the
specified length.
Valve spring tension out of range: → Replace
Service Limit: (IN/EX)
182N-210N/31.5mm
Tool: Spring Scale.
Measure valve spring incline.
Spring incline out of range:→ Replace
Valve Spring Incline Limit: 2.5º/1.7mm
Assembly of Cylinder Head
Install each valve spring seat;
Apply moly oil to valve stem seal and fit into
position.
Material: Moly oil
Note: Do not reuse the valve stem seal.
Insert the valves, with stems coated with moly oil all
around.
Note: When inserting the valve, be careful not to
damage the lip of the stem seal.
LH500ATV-D T3 EFI SERVICE MANUA 19.0
CHAPTER 3 ENGINE PAGE. 3- 62