User Manual

200 SETUP AND ADJUSTMENTS
Page 7-11
Continuation of Adjustments
1. Using engine barring socket J 38587-A,
manually rotate engine in normal rotation
direction 120 degrees until pointer in
flywheel housing aligns with the “5” mark on
the flywheel. The No. 5 piston will be on the
compression stroke. If engine is equipped
with a pointer on the timing gear cover and
marks on the vibration damper, rotate the
engine until the pointer marked VALVE
aligns with the “5” mark on the vibration
damper. Refer to Figure 7-11.
Figure 7-11 — Engine Crankshaft Rotation
2. Adjust the yoke, valves and slave piston lash
as previously outlined for the No. 1 cylinder.
E7 engine firing order is 1 - 5 - 3 - 6 - 2 - 4.
3. Continue adjusting yokes, valves and slave
cylinder lash for the remaining cylinders, in
firing order, placing each piston 30 degrees
past TDC by rotating the crankshaft and
aligning marks on the flywheel with pointer
marked VALVE and appropriate mark on
vibration damper, if equipped.
[221 GP] INJECTION PUMP
FIXED-TIMING PROCEDURES
Whenever the injection pump is removed from a
MACK E7 engine, it is necessary to set injection
pump-to-engine timing using the fixed-timing
method. This method uses a portable fixed-timing
light which electronically determines port closure
to verify precise injection pump-to-engine timing.
Description
The fixed-timing method is a simple, accurate
procedure which uses a timing light to set
injection-to-engine timing. Using the fixed-timing
method ensures optimum fuel economy and
engine durability, and maintains engine exhaust
within established EPA limits.
Figure 7-12 — Fixed Timing Method
Make sure key is off.
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5-101.bk Page 11 Friday, March 17, 2006 11:05 AM