Perkins Phaser Series - Page 140

ENGINE TIMING 17A
Engine timing
To set number 1 piston to TDC on the
compression stroke17A-01A
Special tools:
Valve spring compressor, PD.6118B
Stud adaptor for use with PD.6118B, PD.6118B-7
Setscrew adaptor for use with PD.6118B,
PD.6118B-8
1 Fasten a temporary pointer to the timing case
cover with its tip near to the outer edge of the
crankshaft pulley or damper (A1).
2Remove the rocker cover, operation 12A-01.
3 Rotate the crankshaft, clockwise from the front,
until the push rod for the inlet valve of the rear
cylinder just tightens.
4 Remove the spring clip and the spacer from the
front of the rocker shaft. Release the fasteners of
the front two pedestals of the rocker shaft and
remove the front rocker lever; tighten the fasteners
of the rocker shaft pedestals.
5 Remove the valve springs from the front valve
with the valve spring compressor PD.6118B and the
adaptor PD.6118-7, for pedestal studs, or the
adaptor PD.6118-8, for pedestal setscrews.
Caution: Fit a suitable collar near the top of the
valve to hold the valve if the crankshaft is rotated
too far.
6 Allow the valve to be held by the top of the
piston.
7 Fasten a dial test indicator with its plunger in
contact with the top of the valve stem (A2) and with
a reading shown on the gauge. Rotate slowly the
crankshaft, clockwise from the front, until the
clockwise movement of the dial gauge pointer just
stops. Make a suitable mark on the crankshaft
pulley or damper to align with the temporary
pointer. Continue to rotate the crankshaft, in the
same direction, until the gauge pointer just begins
to move in a counter-clockwise direction. Make
another mark on the pulley or damper to align with
the pointer. Mark the centre point between the two
marks on the pulley or damper and remove the
other two marks.
8 Rotate the crankshaft approximately 45° counter-
clockwise from the front and then clockwise until
the mark on the pulley or damper is aligned with the
pointer. Number 1 piston is now at TDC on the
compression stroke.
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1
PA173
Perkins Phaser/1000 Series, April 1995 17A.03