2-10 PERIODIC MAINTENANCE
3. Rotate crankshaft counterclockwise to bring cam nose verti-
cal to shim surface.
4. Measure tappet clearances by inserting thickness gauge
between cam and shim surface.
Tappet clearance (cold engine condition):
IN.: 0.23 – 0.27 mm (0.009 – 0.011 in)
EX.: 0.30 – 0.34 mm (0.012 – 0.013 in)
! 09900-20803: Thickness gauge
#
NOTE:
• Rotate crankshaft and measure clearance for each tappet
respectively by bringing cam nose vertical to shim surface.
• All tappet clearances can be measured during two crankshaft
rotations.
5. If out of specification, adjust tappet clearance by changing
shim.
ADJUSTMENT
Tappet clearances are adjusted by replacing tappet shim.
1. With cam nose vertical to valve, turn tappet cut-away
towards center of cylinder head as shown in figure.
2. Rotate crankshaft to open (lift up) valve and then remove
camshaft housing bolts where shim is to be replaced.
3. Install special tool with camshaft housing bolts as shown in
figure.
! 09916-69310: Tappet holder
This is left hand (LH) rotation powerhead.
Rotate crankshaft counterclockwise to prevent water
pump impeller damage.
90˚90˚
Cut section of the tappet
Plug hole
!
Shim
Camshaft housing bolt
Plug hole
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