Adjusting Valve Clearances - Westerbeke 9.0 BCG Technical Manual

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ADJUSTING VALVE CLEARANCES
1. Adjust the valve clearances according to the following specifications. (Adjustments are made using the
appropriate feeler gauge between the rocker arm and its associated cam lobe on the cam shaft, as shown
in the figures below.)
Adjusting Valve Clearances
A. On the two-cylinder BCG 4.0KW engine, adjust the valve clearances as follows:
1. Set the piston of the No.1 cylinder at the end of its compression stroke. Adjust the NO.1 intake and
exhaust valve clearances as specified below.
Valve Clearance
(engine cold)
Intake 0.0098 inches (0.25 mm)
Exhaust 0.0098 inches (0.25 mm)
2. Rotate crankshaft 360°. Adjust the No.2 intake and exhaust valve clearances as specified above.
B. On the three-cylinder BCG 6.5KW and the BTG 9.0KW engines, adjust valve clearances as follows:
1. Set the piston of the No.1 cylinder at the end of its compression stroke. Adjust the No.1 and No.
3 intake valve clearances and the No. 1 and No.2 exhaust valve clearances as specified below.
Valve Clearances
(engine cold)
Intake 0.0071 inches (0.20 mm)
Exhaust 0.0071 inches (0.20 mm)
2. Set the piston of the No. 1 cylinder at the top of its intake and the end of its exhaust stroke (rotate
the crankshaft 360°). Adjust the No.2 intake and the No.3 exhaust valve clearances as specified
above.
2. Install the upper and lower timing belt covers, ensuring thatthe associated dust seals are properly installed
and that the crankshaft timing belt pulley flange is properly positioned in front of the pulley.
Tightening Torque:
1.4 - 2.9 Ib-ft (0.2 - 0.4 kg-m)
153 Westerbeke Generators