Yamaha F350B - Adjusting the Valve Clearance

7-5
Power unit (check and adjustment)
Adjusting the valve clearance
Adjust the valve clearances when the engine is
cold.
• Do not turn the flywheel magneto counter-
clockwise. Otherwise, the water pump im-
peller could be damaged.
• Do not turn the flywheel magneto, VCT as-
sembly or driven sprocket when the tim-
ing belt is not installed. Otherwise, the
pistons and valves, or intake and exhaust
valves will collide with each other and be
damaged.
1. Reduce:
• Fuel pressure
See “Reducing the fuel pressure” (6-1).
2. Disconnect:
• Quick connector
See “Disconnecting the quick connector”
(6-1).
3. Remove:
• Fuel hose (high-pressure)
• Intake manifold (STBD)
See “Intake manifold” (6-10).
4. Remove:
• Wire harness
See “Wire harness” (7-18).
• Wire harness guide “1”
5. Remove:
• Flywheel magneto
• Pulser coil
• Stator assembly
See “Removing the flywheel magneto” (7-
15).
6. Remove:
• Timing belt
See “Removing the timing belt” (7-34).
7. Remove:
• VCT assembly
• Driven sprocket
• Camshaft
See “Removing the camshaft, VCT as-
sembly, and driven sprocket” (7-39).
TIP:
Make sure to keep the parts in the order of re-
moval.
8. Measure:
• Valve lifter thickness “a”
TIP:
• Make sure to keep the parts in the order of re-
moval.
• Write down the measurement data.
1
a