Operation 8-2 To Check The Valve Timing - Perkins 900 Series Workshop Manual

8
900 Series
To check the valve timing Operation 8-2
1 Check and, if necessary, adjust the valve tip clearances, see Operation 3-6.
2 Set number 1 cylinder to TDC on the compression stroke.
3 Make a mark on the crankshaft pulley. Fit a suitable pointer to the timing case cover to align with the mark
on the pulley.
4 Turn the crankshaft, clockwise from the front, until the exhaust valve of number 3 cylinder is fully open.
5 Set the valve tip clearance of number 1 cylinder inlet valve to 0,631 mm (0.025 in).
6 Turn the crankshaft, clockwise from the front, until the push rod for number 1 cylinder inlet valve just tightens.
1
In this position, check if the mark on the crankshaft pulley is within 2 / ° of the pointer.
2
1
2 / ° is 3,5 mm (0.14 in) at the circumference of the standard pulley, that has a diameter of 163,2 mm (6.43 in).
2
1
7 If the timing is more than 2 / ° out of position, the timing gears are probably not in correct mesh.
2
8 One tooth on the camshaft gear is equivalent to 20.5 mm (0.81 in) of pulley circumference for a pulley of
163,2 mm (6.43 in) diameter.
9 Turn the crankshaft, clockwise from the front, until the inlet valve of the rear cylinder is fully open. Set the
valve tip clearance of the inlet valve of number 1 cylinder to 0,20 mm (0.008 in).
10 Fit the rocker cover, see Operation 3-1.
11 Remove the temporary pointer from the timing case and the timing mark from the pulley.
Workshop Manual, TPD 1345E, issue 3 123
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