1W0339 ENGINE AR Caterpillar parts
3208, PS-500
Rating:
Alternative (cross code) number:
CA1W0339
1W-0339
1W0339
CA1W0339
1W-0339
1W0339
Weight: 34 pounds 15 kg.
INDUSTRIAL ENGINE, PNEUMATIC COMPACTOR,
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Information:
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.
This Program can be administered either before or after a failure. In either case the decision whether to apply the Program is made by the dealer. When reporting the repair, use "PS4559" as the Part Number and "7755" as the Group Number. If administered before failure, use "56" as the Warranty Claim Description Code and use "T" as the SIMS Description Code. If administered after failure, use "96" as the Warranty Claim Description Code and use "Z" as the SIMS Description Code.
Termination Date
September 30, 1999Problem
Some 3126B Engines on Freightliner Custom Chassis installations were possibly built with Jacobs brand exhaust brakes designed for 3126 Engines. The 3126 Engine brake (p/n=148-7479) has a .359" orifice to produce 55 psi backpressure while the 3126B Engine brake (p/n=156-4162) has a .433" orifice to produce 40 psi. The 3126 brake on the 3126B could cause valve failures.
Affected Product
Model & Identification Number
3126B (7AS679-685, 7AS687-687, 7AS704-706, 7AS708-708, 7AS731-735, 7AS745-746, 7AS748-748, 7AS766-766, 7AS795-798, 7AS829-831, 7AS836-840, 7AS853-855, 7AS870-872, 7AS890-890, 7AS904-905, 7AS957-970, 7AS981-984, 7AS988-994, 7AS1070-1070, 7AS1147-1148, 7AS1163-1164, 7AS1326-1327, 7AS1415-1416, 7AS1418-1420, 7AS1423-1427, 7AS1477-1481, 7AS1483-1488, 7AS1494-1496, 7AS1552-1557, 7AS1559-1559, 7AS1561-1570, 7AS1603-1604, 7AS1606-1609, 7AS1657-1658, 7AS1660-1662, 7AS1801-1802, 7AS1804-1807, 7AS1879-1883, 7AS1886-1891, 7AS1905-1907, 7AS1980-1986, 7AS1988-1988, 7AS2028-2030, 7AS2032-2032, 7AS2034-2038, 7AS2061-2068, 7AS2070-2077, 7AS2190-2201, 7AS2320-2322, 7AS2370-2373, 7AS2421-2421, 7AS2684-2684, 7AS2686-2695, 7AS2737-2738, 7AS2740-2744, 7AS2786-2789, 7AS2792-2792, 7AS2867-2867, 7AS2875-2875, 7AS2877-2885, 7AS2887-2888, 7AS2890-2893, 7AS2895-2905, 7AS3191-3200, 7AS3299-3299, 7AS3326-3326, 7AS3469-3471, 7AS3473-3473, 7AS3823-3828, 7AS3830-3831, 7AS3834-3834, 7AS4085-4085, 7AS4264-4266, 7AS4268-4268, 7AS4345-4346, 7AS4486-4489, 7AS4491-4492, 7AS4494-4494, 7AS4540-4548, 7AS4741-4744, 7AS4959-4959, 7AS4961-4961, 7AS5173-5176, 7AS5238-5238, 7AS5284-5284, 7AS5286-5286, 7AS5288-5290, 7AS5292-5292, 7AS5446-5448, 7AS5540-5542, 7AS6017-6018, 7AS6020-6020, 7AS6261-6262, 7AS6395-6397, 7AS6399-6399, 7AS6401-6401)
Parts Needed
Dealers will need to order parts for this Program.
1 - 1436505 Seal1 - 1487472 SealAction Required
Check the part number on the brake of the attached list of engines. If the chassis has the 156-4162 Brake, do nothing. If the chassis has the 148-7479 Brake, perform the attached Rework Procedure.
Service Claim Allowances
This is a 3-hour job.
Parts Disposition
Handle the parts in accordance with your Warranty Bulletin on warranty parts handling.
Attach.(1-Rework Procedure)Rework Procedure
Part 1: Exhaust Brake Assembly Removal
1. Before beginning the modification procedure, obtain new gaskets as required. In all cases where the exhaust brake has been installed on a vehicle, a 1436505 Seal will be required (this is the gasket between the header pipe and the exhaust brake assembly). If you must disassemble the header pipe from the turbo outlet to remove the exhaust brake assembly, a 1487472 Seal is also required.2. Ensure the vehicle ignition is off and that there is no power to the exhaust brake circuit. Unplug the exhaust brake solenoid from the main wire harness.3. Remove the air line to the air cylinder on the exhaust brake assembly.4. Note how the exhaust brake assembly is oriented so that you can install it in the same position. Remove the exhaust brake assembly from the vehicle by loosening the "V" clamps holding the assembly to the header
This Program can be administered either before or after a failure. In either case the decision whether to apply the Program is made by the dealer. When reporting the repair, use "PS4559" as the Part Number and "7755" as the Group Number. If administered before failure, use "56" as the Warranty Claim Description Code and use "T" as the SIMS Description Code. If administered after failure, use "96" as the Warranty Claim Description Code and use "Z" as the SIMS Description Code.
Termination Date
September 30, 1999Problem
Some 3126B Engines on Freightliner Custom Chassis installations were possibly built with Jacobs brand exhaust brakes designed for 3126 Engines. The 3126 Engine brake (p/n=148-7479) has a .359" orifice to produce 55 psi backpressure while the 3126B Engine brake (p/n=156-4162) has a .433" orifice to produce 40 psi. The 3126 brake on the 3126B could cause valve failures.
Affected Product
Model & Identification Number
3126B (7AS679-685, 7AS687-687, 7AS704-706, 7AS708-708, 7AS731-735, 7AS745-746, 7AS748-748, 7AS766-766, 7AS795-798, 7AS829-831, 7AS836-840, 7AS853-855, 7AS870-872, 7AS890-890, 7AS904-905, 7AS957-970, 7AS981-984, 7AS988-994, 7AS1070-1070, 7AS1147-1148, 7AS1163-1164, 7AS1326-1327, 7AS1415-1416, 7AS1418-1420, 7AS1423-1427, 7AS1477-1481, 7AS1483-1488, 7AS1494-1496, 7AS1552-1557, 7AS1559-1559, 7AS1561-1570, 7AS1603-1604, 7AS1606-1609, 7AS1657-1658, 7AS1660-1662, 7AS1801-1802, 7AS1804-1807, 7AS1879-1883, 7AS1886-1891, 7AS1905-1907, 7AS1980-1986, 7AS1988-1988, 7AS2028-2030, 7AS2032-2032, 7AS2034-2038, 7AS2061-2068, 7AS2070-2077, 7AS2190-2201, 7AS2320-2322, 7AS2370-2373, 7AS2421-2421, 7AS2684-2684, 7AS2686-2695, 7AS2737-2738, 7AS2740-2744, 7AS2786-2789, 7AS2792-2792, 7AS2867-2867, 7AS2875-2875, 7AS2877-2885, 7AS2887-2888, 7AS2890-2893, 7AS2895-2905, 7AS3191-3200, 7AS3299-3299, 7AS3326-3326, 7AS3469-3471, 7AS3473-3473, 7AS3823-3828, 7AS3830-3831, 7AS3834-3834, 7AS4085-4085, 7AS4264-4266, 7AS4268-4268, 7AS4345-4346, 7AS4486-4489, 7AS4491-4492, 7AS4494-4494, 7AS4540-4548, 7AS4741-4744, 7AS4959-4959, 7AS4961-4961, 7AS5173-5176, 7AS5238-5238, 7AS5284-5284, 7AS5286-5286, 7AS5288-5290, 7AS5292-5292, 7AS5446-5448, 7AS5540-5542, 7AS6017-6018, 7AS6020-6020, 7AS6261-6262, 7AS6395-6397, 7AS6399-6399, 7AS6401-6401)
Parts Needed
Dealers will need to order parts for this Program.
1 - 1436505 Seal1 - 1487472 SealAction Required
Check the part number on the brake of the attached list of engines. If the chassis has the 156-4162 Brake, do nothing. If the chassis has the 148-7479 Brake, perform the attached Rework Procedure.
Service Claim Allowances
This is a 3-hour job.
Parts Disposition
Handle the parts in accordance with your Warranty Bulletin on warranty parts handling.
Attach.(1-Rework Procedure)Rework Procedure
Part 1: Exhaust Brake Assembly Removal
1. Before beginning the modification procedure, obtain new gaskets as required. In all cases where the exhaust brake has been installed on a vehicle, a 1436505 Seal will be required (this is the gasket between the header pipe and the exhaust brake assembly). If you must disassemble the header pipe from the turbo outlet to remove the exhaust brake assembly, a 1487472 Seal is also required.2. Ensure the vehicle ignition is off and that there is no power to the exhaust brake circuit. Unplug the exhaust brake solenoid from the main wire harness.3. Remove the air line to the air cylinder on the exhaust brake assembly.4. Note how the exhaust brake assembly is oriented so that you can install it in the same position. Remove the exhaust brake assembly from the vehicle by loosening the "V" clamps holding the assembly to the header
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