B) Feeler Gauge Method
Figure 3-6
1. Set engine brake valve lash using the adjusting
screw located above each slave piston. The engine
crankshaft must be rotated to allow the exhaust
valve to be fully closed prior to making adjustment
on each cylinder.
2. Back out the adjusting screw on each cylinder
to be adjusted. Using a 0.023" feeler gauge
between the slave piston and the exhaust
crosshead, turn in the slave piston adjusting screw
until a slight drag is felt on the gauge.
3. Tighten the adjusting screw lock nut to 25 lbft
(35 N*m) torque. Rotate the crankshaft, adjusting
each adjusting screw in firing order sequence.
Operational Check
Installation of the brake housings is now complete.
Functioning of the brakes should be checked before
proceeding further.
1. Start the engine and let it idle for a short time.
3
Figure 3-7
2. Bleed air from the engine brake housing.
Accelerate the engine to about 1800 RPM then
release the throttle. Quickly depress the solenoid as
shown to cause the brake to operate. This process
should be repeated 5-6 times on each brake
assembly in order to fill the housings with lube oil.
When all of the air has been removed the brake
should operate immediately when the solenoid is
depressed.
CAUTION
Wear eye protection. When engine is running with
valve covers removed, oil splashing will occur.
Take precautions to prevent oil contaminating
engine and engine compartment.
SECTION 4- ELECTRICAL SYSTEM INSTALLATION
Installation of the electrical system involves the
mounting of ON/OFF dash switches that have gold-
plated contacts. Wiring harnesses and wiring diagram
are provided in the control group to complete the
installation. Refer to the wiring diagram Figure 4-1.
Dash Switches
Dash switches should be installed in dash where they
are visible and convenient to operate.
1. Drill holes in dash to accommodate switches and
install switches with proper name plates.
2. To check the electrical system, start the engine.
and activate engine brake with the ON/OFF switches.
The Celect low speed shut off will prevents the engine
brake from coming on at idle. Accelerate until the
engine reach 1800 RPM and release the throttle. The
center engine brake housing should operate with one
ON/OFF switch. Repeat this operation for the
remaining 2 and 3 positions. The front and rear brake
housings should operate with the other ON/OFF
switch, and all three engine brake housings should
operate with both ON/OFF switches. After this
procedure, shut down engine.
3. To complete the installation, reinstall the Cummins
valve cover gaskets, replace valve covers, and all
previously removed parts. Torque valve cover
capscrews to 9 lbft (12 N*m).
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