Valve Adjustment - Yale GDP16-20AF Maintenance Manual

600 YRM 496
1. Rotate crankshaft until No. 1 piston is at TDC on
compression stroke (intake and exhaust valves
closed).
2. Adjust clearance of intake valves for No. 1 and No. 2
cylinders and exhaust valves for the No. 1 and No. 3
cylinders. See Figure 52. Correct clearance for all
valves when engine is hot is 0.3 mm (0.012 in.).
To adjust clearance, loosen lock nut and turn ad-
justment screw. Tighten lock nut to 16 to 21 N•m
(12 to 15 lbf ft).
NOTE: During adjustment of valves, check position of
balls in ends of rocker arms. Flat surface of ball must
be in contact with stem of valve.
3. Rotate crankshaft clockwise one complete turn.
Adjust remaining valves.
4. If valves are adjusted when engine is cold, check
adjustments again after engine is warm.

Valve Adjustment

A. INTAKE VALVES
1. CAMSHAFT
2. ROCKER ARM
Valve Adjustment
B. EXHAUST VALVES
3. BALL
4. VALVE STEM
Figure 52. Valve Adjustment
23