3-26 ENGINE
VALVE SPRING
The force of the coil spring keeps the valve seat tight. Weak-
ened spring results in reduced engine power output, and often
accounts for the chattering noise coming from the valve mecha-
nism.
Check the valve spring for proper strength by measuring its free
length and also by the force required to compress it.
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 the spring.
Valve spring free length:
Service limit: (IN) 32.8 mm (1.29 in)
(EX) 32.8 mm (1.29 in)
\ 09900-20102: Vernier calipers
Valve spring tension:
Standard:
(IN & EX) 110 – 126 N, 11.0 – 12.6 kgf/ 26.8 mm
(79.5 – 91.1 lbs/ 1.05 in)
REASSEMBLY
• Install the valve spring seat.
• Apply MOLYBDENUM OIL SOLUTION to the oil seal
1
, and
press-fit it into position.
P MOLYBDENUM OIL SOLUTION
• Insert the valve, with its stem coated with MOLYBDENUM
OIL SOLUTION all around and along the full stem length with-
out any break.
P MOLYBDENUM OIL SOLUTION
• Install the valve spring with the small-pitch portion
A
facing
cylinder head.
B
Large-pitch portion
C
UPWARD
D
Paint
IN & EX. 110 – 126 N (11.0 – 12.6 kgf)
IN & EX. 26.8 mm (1.05 in)
Do not reuse the removed oil seal.
When inserting the valve, take care not to damage the
lip of the oil seal.
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