Valve Timing - Perkins UA Workshop Manual

8
700 Series

Valve timing

To check Operation 8-1
Check and, if necessary, adjust the valve tip clearances.
Rotate the crankshaft, clockwise from the front, until the valve is fully open. The piston for number one cylinder
is now on the compression stroke.
Set the valve tip clearance for the valve to 0,59 mm (0.023 in).
Rotate the crankshaft, clockwise from the front, until the push rod for the valve just tightens. In this position,
check if the mark on the crankshaft pulley is within 2.5° of the mark (A1) on the timing case. If it is, the valve
timing is correct.
If the timing is more than 2.5° out of position, the timing gears are probably not in correct mesh.
Use the formula below to find the measurement on the pulley that is equal to 2.5°.
(C x P) / 360, where:
C = Circumference of the pulley
P = 2.5°
Rotate the crankshaft, clockwise from the front, until the valve (B7) has just opened and the valve (B8) has not
closed completely. Set the valve tip clearance of the valves (B1 and B2) to 0,35 mm (0.014 in).
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Workshop Manual, TPD 1392E, issue 3 117
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