3-34 ENGINE
VALVE STEM END CONDITION
Inspect the valve stem end face for pitting and wear. If pitting or
wear of the stem end face are present, the valve stem end may
be resurfaced, providing that the length
1 will not be reduced to
less than the service limit. If this length becomes less than the
service limit, the valve must be replaced.
% Valve stem end length
Service Limit: 1.7 mm (0.07 in)
VALVE SPRING
The force of the coil spring keeps the valve seat tight. Weakened
spring result in reduced engine power output, and often account
for the chattering noise coming from the valve mechanism.
Check the valve springs for proper strength by measuring their
free length and also by the force required to compress them. If the
spring length is less than the service limit, or if the force required
to compress the spring does not fall within the range specified,
replace both the inner and outer springs as a set.
( 09900-20101: Vernier calipers
% Valve spring free length (IN & EX)
Service Limit : 38.8 mm (1.53 in)
% Valve spring tension (IN & EX)
Standard: 18.2 – 21.0 kgf
(40.1 – 46.3 lbs)
at length 31.5 mm (1.24 in)
REASSEMBLY
• Install each valve spring seat.
• Apply molybdenum oil solution to each oil seal and press-fit
them into position.
( 09916-44310: Valve guide remover/installer
* MOLYBDENUM OIL SOLUTION
"
Do not reuse the oil seal.
18.2 – 21.0 kgf (40.1 – 46.3 lbs)
31.5 mm (1.24 in)
To Next Page
Loading...
