DESCRIPTION AND OPERATION
Page 21
CAMSHAFT AND VALVE TRAIN
The engine has an overhead camshaft, rocker
arm shaft and four valves per cylinder.
Replaceable valve guides and seats are made of
alloyed cast iron and steel respectively. All valve
guides have oil seals. All of the valves have
double valve springs. Each valve rocker arm
drives two valves via a pinless yoke. Exhaust
valve yokes on PowerLeash™ engines include a
shim for adjustment.
8
Figure 8 — Valve Train
The camshaft is induction-hardened and can be
ground to accept oversize bearings. Timing
marks for valve and injector adjustment are
located on the flange forward of the No. 7
camshaft journal.
Camshaft thrust washers are integral on the No. 7
journal bearing.
The PowerLeash™ camshaft differs from the
regular by including two additional lobes
(charging and decompression) on the exhaust
cam. Two sets of timing marks on the
PowerLeash™ camshaft provide for valve and
injector adjustment. The letter V indicates the
PowerLeash™ setting points. PowerLeash™
includes its own electronic control valve governed
by driver's choice through a switch near the
steering wheel. This control valve mounts on the
left corner of the cylinder head by the use of two
mounting bolts and an oil tube leading from the
control valve to the rockershaft. The wiring
harness includes additional wire leads for
PowerLeash™.
1. Inlet Valve Yoke
2. PowerLeash™ Exhaust Valve Yoke
3. Adjustment Shim
4. Shim Clamping Screw
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