PRODUCT SUPPORT PROGRAM FOR REPLACING 115-9398 ROCKER ARM, 115-9399 ROCKER ARM, 176-4168 BRIDGE, AND 214-0586 OUTER VALVE SPRING ON CERTAIN C12 INDUSTRIAL ENGINES Caterpillar

PRODUCT SUPPORT PROGRAM FOR REPLACING 115-9398 ROCKER ARM, 115-9399 ROCKER ARM, 176-4168 BRIDGE, AND 214-0586 OUTER VALVE SPRING ON CERTAIN C12 INDUSTRIAL ENGINES

Usage:

REBE5175-00

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22May2009

H335
L240
L262
M638
T070
T210
V470

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After Failure Only (Limited distribution)	PRODUCT SUPPORT PROGRAM FOR REPLACING 115-9398 ROCKER ARM, 115-9399 ROCKER ARM, 1764168/">176-4168 BRIDGE, AND 214-0586 OUTER VALVE SPRING ON CERTAIN C12 INDUSTRIAL ENGINES
1102 1100 1209 1123 1121		PS51671

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NOTE:

This Program can only be administered after a failure occurs. The decision whether to apply the Program is made by the dealer. When reporting the repair, use "PS51671" as the Part Number and "7755" as the Group Number. Use "96" as the Warranty Claim Description Code and use "Z" as the SIMS Description Code.

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NOTE:

The information supplied in this service letter may not be valid after the termination date of this program. Do not perform the work outlined in this Service Letter after the termination date without first contacting your Caterpillar product analyst.

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TERMINATION DATE

31May2011

PROBLEM

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The existing valve bridges can be worn prematurely on certain C12 Industrial Engines. If the existing Valve Bridges are worn, valve lash cannot be set correctly, which can result in valve mechanism failures.

AFFECTED PRODUCT

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Model

Identification Number

C12

BDL01605, 2444, 2729, 2731, 2924, 2945-2946, 3016, 3022, 3141, 3153, 3160, 3371, 3717, 3771, 3779, 3785, 3846, 3892, 4197, 4200, 4206-4207, 4211-4213, 4221, 4469-4470, 4472-4473, 4517, 4521-4522, 4527-4528, 4530-4532, 4548-4550, 4554, 4614, 4858, 4930, 4958-4962, 4968, 4977-4981, 5058-5067, 5077-5078, 5082-5083, 5104, 5111-5114, 5120-5124, 5161, 5166, 5168, 5173, 5175, 5178, 5312, 5321, 5326-5327, 5331-5332, 5334, 5336-5338, 5347, 5349-5350, 5352-5353, 5355-5358, 5360-5361, 5364, 5366-5368, 5372-5373, 5375, 5377, 5379, 5528-5531, 5554, 5563

PARTS NEEDED

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Qty	Part Number	Description
6	10R1707	ARM-VALVE ROCKER
6	10R1797	ARM-VALVE ROCKER
12	1764168	BRIDGE AS-VALVE
24	3322152	SPRING-VALVE
In order to allow equitable parts availability to all participating dealers, please limit your initial parts order to not exceed 8% of dealership population. This is an initial order recommendation only, and the ultimate responsibility for ordering the total number of parts needed to satisfy the program lies with the dealer.

ACTION REQUIRED

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When performing engine valve lash adjustment, inspect the valve bridges for excessive wear. Refer to reuse and salvage guidelines, SEBF8002 for reusability recommendations. If the bridges do not meet the requirements for reusability, the Service Letter may be applied. Images of the valve bridges being replaced must be attached to the service claim.

Refer to the attached Rework Procedure.

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SERVICE CLAIM ALLOWANCES

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Product smu/age whichever comes first	Caterpillar		Dealer Suggested		Customer Suggested
Product smu/age whichever comes first	Parts %	Labor Hrs%	Parts %	Labor Hrs%	Parts %	Labor Hrs%
0-3000 hrs, 0-24 mo	100.0%	100.0%	0.0%	0.0%	0.0%	0.0%
3001-6000 hrs, 25-36 mo	70.0%	70.0%	0.0%	0.0%	30.0%	30.0%
6001-9000 hrs, 37-48 mo	35.0%	35.0%	0.0%	0.0%	65.0%	65.0%

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NOTE: This is a 5.0-hour job

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PARTS DISPOSITION

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Handle the parts in accordance with your Warranty Bulletin on warranty parts handling.

Rework Procedure

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1) Remove the valve covers.

2) Remove the rocker shaft hold down bolt.

3) Remove the entire rocker shaft, injector rocker arm, intake rocker arm, exhaust rocker arm and valve bridges.

4) Remove the injector hold down bolt and remove the injector.

5) Roll the cylinder being reworked to Top Dead Center (TDC) to prevent the valves from dropping into the cylinder.

6) Use the 4C-6726 Service Tool to compress the valve springs. CAUTION: Do not let the valve drop into the cylinder.

7) Remove the valve keepers and the rotocoils after the springs are compressed.

8) Slowly release the service tool and remove the outer valve spring.

9) Replace all four outer valve springs with the new 332-2152 Valve Spring.

10) Install the rotocoils and compress the spring using the 4C-6726 Service Tool.

11) Install the valve keepers. Ensure the keepers are seated properly. Slowly release the service tool.

12) Install the new exhaust rocker arm, intake rocker arm and the valve bridges. Refer to Disassembly and Assembly Manual, SENR9574.

13) Repeat steps 2-12 on the remaining five cylinders. Be sure to roll each cylinder to TDC prior to compressing the springs and removing the valve keepers.

14) Reset the valve lash and the injector height after all six cylinders are reworked.