Brake Housing Installation - Mack E7 Service Manual

5-101.bk Page 60 Friday, March 17, 2006 11:05 AM
2. Check that all push rods are in their sockets
and rocker adjusting screws are backed out
to prevent piston damage or bent rods.
3. Start at the center and tighten each bracket
hold-down screw in two steps:
Torque to 20 lb-ft (27 N•m).
Retorque to 40 lb-ft (54 N•m).
4. Lubricate and install O-rings in the groove in
the Jacobs oil supply screws. Install the
screws into the rocker brackets and tighten
to 5 lb-ft (7 N•m).
3
2
1
16
15
14
13
12
7
11
10
9
9
Figure 6-70 — Valve Rocker Arm Installation
(with Jake Brake)
1. Wire connector
2. Riser
3. Valve cover
4. Short capscrew
5. Long capscrew
6. Actuator capscrew
7. Rocker arm shaft
bracket
8. Valve yoke
Page 6-60
200 ENGINE ASSEMBLY
5
4
6
7
7
8
200263a
9. Head bolt with threaded
hole
10. Push rod
11. Rocker arm assembly
12. Washer
13. Capscrew
14. Connector
15. Actuator assembly
16. Actuator solenoid

Brake Housing Installation

Refer back to Figure 6-70.
1. Lubricate the oil supply screw O-rings with
clean engine oil.
2. Place the engine brake housing in position
on the rocker arm shaft brackets. Be sure
the housing marked FRONT is over
cylinders 1, 2 and 3, and the housing
marked REAR is over cylinders 4, 5 and 6.
Position the housings so that the oil supply
bores are located over the oil supply screws.
Carefully push the housings down until the
O-rings enter the bores and the housings
rest flat against the rocker-arm shaft
brackets.
3. Lubricate all six Jacobs hold-down
capscrews with clean engine oil and install
them through the housings and into the
rocker shaft brackets.
4. Start with the center capscrew on each
housing and tighten them to 20 lb-ft
(27 N•m). Retorque each, starting with the
center capscrew, to 45 lb-ft (61 N•m) using
torque wrench J 24407 or equivalent.
5. Check for interference between rocker arm
and slave piston by manually moving each
rocker arm with the valves closed. Be sure
to check all cylinders. If binding occurs,
loosen the capscrews and reposition the
housing.
6. Connect wiring to Jake actuator solenoid.
7. Adjust yoke, valve and Jake brake slave
piston lash as needed. Refer to the SETUP
AND ADJUSTMENTS section in this manual
for correct specifications and procedures.