1.29 JAKE BRAKE
NOTICE:
Do not mix the rocker arm shaft bolts and the Jake Brake mounting
bolts. If the rocker arm shaft bolt is mistakenly used to mount the
Jake Brake housing, the longer shoulder on the bolt will block the
oil supply to the Jake Brake on the camshaft side of the housing.
The brake will not retard the engine as designed. This condition
could cause loss of vehicle braking control on downgrades, which
may create a risk of personal injury to the vehicle operator or other
persons and damage to the vehicle or property of others.
NOTE:
The rocker arm shaft mounting bolt and Jake Brake mounting bolt, part of the Jake
Brake assembly, are similar in appearance. Both are M12 x 110 mm (4.33 in.) long
and have 12–point heads.
NOTE:
In the event of a housing hold down bolt failure on a Jacobs engine brake housing,
replace all bolts on that particular housing.
NOTICE:
Use bolts that have the Jacobs logo, circled "J". Installation
of bolts that do not have the circled "J" may result in damage
to the engine, engine brake or both.
[a] The Jake Brake bolt has the Jacobs logo (circled "J") and the letters "EF" marked on
the head. The bolt length is no longer marked atop the bolt head.
[b] The DDC rocker arm shaft bolt has the DDC logo (spinning arrows) and the vendor
I.D. (F-C) on its head.
[c] Jake Brake model 760 requires two bolts along with one bolt and new washers.
NOTE:
Be sure that only Jake Brake bolts, see Figure 1-437, are installed in the Jake Brake
housing.
All information subject to change without notice.
1-554 From Bulletin 16-60-99 6SE483 9901 Copyright © 1999 DETROIT DIESEL CORPORATION
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