Operation and Maintenance Manual forWP10 Series Four-valve Diesel Engine (China IV, V)
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e. Start the engine to check for oil leakage.
Figure 5-9
Check and adjust intake/exhaust valve clearance
Check and adjust intake/exhaust valve clearance as follows:
a. With the diesel engine in cold state, turn the flywheel with a bar (along with the running direction of diesel
engine crankshaft) to make the pistons of No. 1 cylinder and No. 6 cylinder to TDC, when the notch groove on
flywheel should be aligned with the pointer on the inspection window cover plate.
b. Remove the valve rocker arm cover from the cylinder head, and determine if the No. 1 cylinder or No. 6
cylinder is in the compression stroke (as indicated by the existence of clearance between the intake/exhaust valve
and the rocker arm under the compression stroke).
c. Use a feeler gauge to check the clearance between the upper plane of valve bridge and rocker arm. For WP10
diesel engine, the intake valve clearance and exhaust valve clearance should be 0.4mm and 0.6mm respectively.
Please rotate the adjusting screw on the rocker arm to achieve proper valve clearance. See figure 5-10.
Figure 5-10 Cold state valve clearance: intake valve, 0.4mm; exhaust valve, 0.6mm
d. After the checking of the No. 1 or No. 6 cylinder, turn the flywheel by another 360°, ensuring that the No. 6
cylinder or No. 1 cylinder is in working stroke, and then adjust the remaining valves (see table 5-1).
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