01B An Other Method To Set Number 1 Piston To Tdc On The Compression Stroke; To Check The Valve Timing - Perkins 1000 Series Workshop Manual

17A
ENGINE TIMING
An other method to set number 1 piston
to TDC on the compression
stroke
1 Fasten a temporary pointer to the timing case
cover (or other suitable position) with its tip near to
the outer edge of the crankshaft damper or pulley.
2 Loosen the setscrews that retain the atomisers.
3 Remove the rocker cover.
4 Rotate the crankshaft clockwise, from the front,
until the push rod for the inlet valve of the rear
cylinder just tightens.
5 Rotate the crankshaft a further 1/8 of a turn
clockwise. Insert a suitable lever between the
rocker lever and the valve spring cap of number 1
inlet valve. Open the inlet valve and put a spacer
approximately 5,0 mm (0.2 in) thick between the
valve tip and the rocker lever.
6 Slowly rotate the crankshaft counter-clockwise
until the piston makes contact with the open valve.
Make a temporary mark on the damper or pulley to
align accurately with the tip of the pointer.
7 Rotate the crankshaft clockwise one or two
degrees and remove the spacer between the valve
and the rocker lever. Rotate the crankshaft 1/4 of a
turn counter-clockwise. Put the spacer between the
valve tip and the rocker lever.
8 Slowly rotate the crankshaft clockwise until the
piston makes contact with the open valve. Make
another temporary mark on the damper or pulley to
align accurately with the tip of the pointer.
9 Make a temporary mark at the centre point
between the two marks on the damper or pulley
and remove the other two marks. Rotate the
crankshaft counter-clockwise 1/8 of a rotate and
remove the spacer between the valve and the
rocker lever. Slowly rotate the crankshaft clockwise
until the mark on the damper or pulley aligns
accurately with the tip of the pointer. Number 1
piston is now at TDC on the compression stroke.
17A.04

To check the valve timing

17A-01B
1 Set the piston of number 1 cylinder to TDC on
the compression stroke,
2 Remove the dial test indicator from number 1
inlet valve and fit the valve springs and the rocker
lever. Ensure that the fasteners for the rocker shaft
pedestals are to the correct torque.
3 Rotate the crankshaft, clockwise from the front,
until the inlet valve of the rear cylinder is fully open.
4 Set the valve tip clearance of number 1 cylinder
inlet valve to 1,5 mm (0.059 in).
5 Rotate the crankshaft, clockwise from the front,
until the push rod of number 1 cylinder inlet valve
just tightens. In this position, check if the mark on
the crankshaft pulley or damper is within +/- 2 1/2°
of the temporary pointer. Use the formula below to
find the measurement which is equal to 2 1/2° on
the pulley or damper.
C = circumference of pulley or damper
P = 2.5 degrees
6 If the timing is more than 2 1/2° out of position,
the timing gears are probablely not in correct mesh.
Note: One tooth on the camshaft gear is equivalent
to 23 mm (0.9 in) at the circumference of a pulley
of 203 mm (8 in) diameter. If a large damper is
fitted, one tooth on the camshaft gear is equivalent
to 35 mm (1.4 in) at the circumference of a damper
of 310 mm (12.2 in) diameter, or 37 mm (1.5 in) at
the circumference of a damper of 327 mm (12.8 in)
diameter.
7 Rotate 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).
8 Fit the rocker cover,
9 Remove the temporary pointer from the timing
case and the timing mark from the pulley or
damper.
operation 17A-01A.
C x P
360
operation 12A-01.
Perkins Phaser/1000 Series, April 1995
17A-02