Suzuki DF 90 Service Manual page 35

2-10 PERIODIC MAINTENANCE
5. Rotate crankshaft counterclockwise to bring cam nose ver-
tical to shim surface.
6. 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. : 0.23 – 0.27 mm (0.009 – 0.011 in.)
09900-20803 : Thickness gauge
This is a left hand (LH) rotation powerhead.
Rotate crankshaft counterclockwise to prevent water
pump impeller damage.
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 turns of
crankshaft.
7. If out of specification, adjust tappet clearance by changing
shim.
ADJUSTMENT
Tappet clearances are adjusted by replacing tappet shim.
1. Close valve and turn tappet cut-away toward inside 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.
09916-49040 : Tappet holder
90˚ 90˚
2
1 Cut section of tappet
3 1
2 Plug hole
3 Shim
1
2
1 Camshaft housing bolt
2 Plug hole