If they appear damaged or deteriorated, replace them.

Balancer Adjustment
Torque LimiterFuel Pump Installation
Remove dirt or dust from the fuel pump [A] by lightly applying
compressed air.
Replace the fuel pump gasket with a new one.
Check that the fuel pump terminal [A] and band [B] are in
place.
Apply a non-permanent locking agent to the threads of
the fuel pump bolts.
Tighten the ...
Camshaft Installation
NOTE
The exhaust camshaft has a 1001 EX mark [A] and the
intake camshaft has a 3154 IN mark [B]. Be careful not
to mix up these shafts.
Install the camshaft sprockets as shown in the figure.
#4 Cam Positions [A]
Intake Camshaft Sprocket [B]
Exhaust Camshaft Sprocket [C]
The int ...
Torque Limiter Installation
Apply molybdenum disulfide grease to the torque limiter
shaft [A].
Install the torque limiter [B], the collar [C] and the shaft.
Turn the large-hole end of the shaft to inside as shown in
the figure.
Replace the washer [D] with a new one.
Apply a non-permanent locking agent to the t ...