2008/12/08 Caterpillar

A New Cat Compression Brake Is Available. {1119, 1129}

Usage:

C15 JRE

Industrial Engine: C15 (S/N: JRE1-UP)

Description of Change: A new Cat compression brake is available on the engines that are listed above. The Cat compression brake is an improvement over the current brake.

Adaptable To:

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Table 1
Engine arrangements that are adaptable to use Cat compression brake.
Serial Number	Horsepower	Engine Arrangement
S/N:JRE00001-7495	475	300-4940 and 241-0020
S/N:JRE00001-7495	440	300-4941 and 254-3832

The Cat compression brake is an option that is available on the engines that are listed in Table 1.

ReferenceDisassembly and Assembly, RENR8630

Note: The Cat compression brake is not adaptable to engine arrangement 254-3835 Engine Arrangement with a "C, D and E" Tier III rating.

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Table 2
475 HP
S/N:JRE00001-7495
Engine Arrangement	300-4940	241-0020	241-0020
Camshaft Group	234-7935	234-7935	234-7935
24 Volt Actuator Assembly	239-9624	239-9624	239-9624
12 Volt Actuator Assembly	269-6798	269-6798	269-6798
Note		Replace studs with nine 304-9553 Studs and three 234-9508 Bolts when the compression brake is installed.	Replace studs with nine 304-9553 Studs and three 234-9508 Bolts if the compression brake is installed.
Valve Mechanism Group	266-3369	190-0009	266-3699
Injector Rocker Arm	278-1363	278-1365	278-1363
Exhaust Rocker Arm	320-2795	320-2797	320-2795
Note	Both rocker arms are compatible with the camshaft group if the brake is installed.	Both rocker arms must be replaced with 278-1363 Rocker Arm and 320-2795 Rocker Arm if the compression brake is installed.	Both rocker arms are compatible with the camshaft group if the brake is installed.
Fastener group for the rocker arm shaft assembly	No new bolts are required.	109-1657	109-1657
Valve cover	234-5005	278-5662	234-5005
Wiring Harness Assembly	307-1610	278-5662	307-1610
Note	The wiring harness will be compatible if the compression brake is used.	The wiring harness must be replaced with 307-1610 Engine Harness As if the compression brake is installed.	The wiring harness will be compatible if the compression brake is used.

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Table 3
440 HP
S/N:JRE1-7495
Engine Arrangement	300-4941	254-3832	254-3832
Camshaft Group	234-7935	234-7935	234-7935
24 Volt Actuator Assembly	239-9624	239-9624	239-9624
12 Volt Actuator Assembly	269-6798	269-6798	269-6798
Note		Replace studs with nine 304-9553 Studs and three 234-9508 Bolts if the compression brake is installed.	Replace studs with nine 304-9553 Studs and three 234-9508 Bolts if the compression brake is installed.
Valve Mechanism Group	266-3699	190-0009	266-3699
Injector Rocker Arm	278-1363	278-1365	278-1363
Exhaust Rocker Arm	320-2795	320-2797	320-2795
Note	Both rocker arms are compatible with the camshaft group if the brake is installed.	Both rocker arms must be replaced with 278-1363 Rocker Arm and 320-2795 Rocker Arm if the compression brake is installed.	Both rocker arms are compatible with the camshaft group if the brake is installed.
Fastener group for the rocker arm shaft assembly	No new bolts are required.	109-1657	109-1657
Valve cover	234-5005	278-5662	234-5005
Wiring Harness Assembly	307-1610	307-1611	307-1610
Note	The wiring harness will be compatible if the compression brake is used.	The wiring harness must be replaced with 307-1610 Engine Harness As if the compression brake is installed.	The wiring harness will be compatible if the compression brake is used.