Mack E7 Service Manual page 252

5-101.bk Page 12 Friday, March 17, 2006 11:05 AM
200 SETUP AND ADJUSTMENTS
On all P7100 non V-MAC mechanically
controlled fuel-injection systems, injection
timing is referenced to the No. 1 cylinder.
The engine must be timed during the
compression stroke of cylinder No. 1.
On all P7100 V-MAC electronically
controlled fuel-injection systems, injection
timing is referenced to the No. 6 cylinder.
The engine must be timed during the
compression stroke of cylinder No. 6.
On all P8500 V-MAC electronically
controlled fuel-injection systems, injection
timing is referenced to the No. 1 cylinder.
The engine must be timed during the
compression stroke of cylinder No. 1.
The injection pump driven gear capscrews on
factory-assembled E7 engines come in three
different head sizes (15 mm, 16 mm or 17 mm).
All four capscrews on a given engine will be the
same and the torque is the same for all three
head sizes: 40 lb-ft (54 N•m).
On mechanically governed engines, different
head sizes pose no problem. On V-MAC engines,
however, different capscrew head sizes can
affect the use of V-MAC hub rotation tool
J 38740, used to rotate the injection pump when
setting injection pump-to-engine timing. J 38740
actually consists of two tools:
An adapter with two posts that fit into tapped
holes in drive hub.
An adapter with two tubes, one on each
end, fit over the heads of two of the timing
adjustment capscrews. (This adapter will not
fit over the heads of some of the timing
adjustment capscrews. If this problem
occurs, simply remove two of the adjustment
capscrews and washers, and use the tool
with posts in the openings.)
Page 7-12
Figure 7-13 — V-MAC Hub Rotation Tool J 38740
When removing capscrews and washers, be
extremely careful not to drop a washer into the
engine. Removing the washer is difficult and may
require some engine disassembly.
Following are procedures for:
Setting Static Fuel Injection Pump Timing
Fuel Injection Pump Driven Gear Installation
Checking Pump-to-Engine Timing
Fuel Injection Pump Access Cover
Installation
Fuel Injection Pump Pre-Lubrication
Timing Event Marker (TEM) Installation
200493a