1.29 JAKE BRAKE
1.29.3.2 Inspection of Model 760, 765, or 770 Jake Brake
The Jacobs engine brake is typically a trouble-free device. However, inspections are necessary
and some maintenance is required. Use the following procedures to keep the engine brake in top
condition.
Inspect the Jake Brake as follows:
1. Inspect slave piston adjusting screw for protrusion, spring pressure and freedom of
movement.
NOTE:
The plunger should protrude from the bottom of the screw, have light spring pressure
apparent when depressed, and move freely. Be sure the retaining ring is fully engaged
in its groove (groove is located on the bottom of the reset screw and top of the
POWER-LASH assembly).
[a] If the plunger does not protrude, the spring does not have light pressure or does not
move freely, replace the entire screw assembly. Refer to Section 1.29.4
[b] If the slave piston adjusting screw meets specifications, continue with inspection.
2. Inspect the accumulator for wear or damage.
[a] If worn or damaged, replace the accumulator. Refer to Section 1.29.4.
[b] If accumulator is not worn or damaged, continue with inspection.
3. Inspect the master piston bore for wear or damage.
NOTE:
Some wear marks are permissible.
[a] If worn or damaged, replace the master piston. Refer to Section 1.29.4.
[b] If not worn or damaged, continue with inspection.
4. Apply clean lube oil to the piston, and insert into bore.
NOTE:
Master piston should move in and out freely with no binding.
[a] If binding occurs, replace master piston and/or housing. Refer to Section 1.29.4.
[b] If no binding occurs, continue with inspection.
5. Inspect master piston spring for relaxation.
NOTE:
The spring should hold the master piston completely in the housing.
[a] If relaxed, replace the spring. Refer to Section 1.29.4.
[b] If spring holds tightly, continue with inspection.
All information subject to change without notice.
1-542 From Bulletin 16-60-99 6SE483 9901 Copyright © 1999 DETROIT DIESEL CORPORATION
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