VALVE GP-RELIEF 1265674 - Caterpillar

Problem
Certain 3176 Truck Engines may experience the following: (1) The fuel transfer pump cover has been replaced with a cover that has the priming bypass valve installed on the outlet pressure side. (2) The turbo boost line may become plugged and may reduce engine performance. (3) Incorrect throttle linkage adjustments may cause low power or rough engine operation.
Affected Product
Model & Identification Number
Fuel Transfer Pump
3176 (2YG1-6318)
This Program does not apply if SIMS indicates that a new fuel transfer pump cover has already been installed. (Rework "Code I" on SIMS)
Boost Line Modification
3176 (2YG1-Up)
This Program does not apply if SIMS indicates that a the boost line modification has already been installed. (Rework "Code P" on SIMS)
Throttle Position Sensor
3176 (2YG1-Up*;7LF1-Up*)
*Not applicable if equipped with a 9X8151 Control Group (Pedal Mounted throttle Position Sensor). This Program does not apply if SIMS indicates that a throttle adjustments have already been made. (Rework "Code Q" on SIMS)
Parts Needed
Fuel Transfer Pump
Replace Cover:
1 - 8C0624 O-ring Seal (pump to engine)1 - 8C5197 O-ring Seal (cover)1 - 4P0989 Fuel Transfer Pump CoverAdd For replacing Transfer Pump:
1 - 8C0624 O-ring Seal (pump to engine)1 - 3K0360 O-ring Seal (connector)1 - 4P3777 Fuel Transfer Pump1 - 9X6650 Connector (2YG1 - 9702 only)Boost Line Modification
1 - 016449 Adapter1 - 9Y6139 Hose1 - 3J7355 Union1 - 9L8493 CapThrottle Position Sensor
No Parts required
Action Required
Fuel Transfer Pump
1. Remove the fuel transfer pump (front and rear cover bolts hold the pump to the engine.2. Remove the transfer pump cover.3. Inspect fuel transfer pump/gears (If fuel transfer pump damage has occurred, replace with a 4P3777 Pump and the necessary parts listed.4. Install 4P0989 Fuel Transfer Pump Cover using new 8C5197 O-ring.5. Install fuel transfer pump using new 8C0624 O-ring.6. If fuel transfer pump damage has occurred, remove hand priming pump and inspect valves for damage and debris. Repair and clean as necessary.Boost Line Modification
1. Remove boost line from transducer and check for presence of water or corrosion. If evidence of moisture is found, clear restriction and drain water from boost line. Install boost line to transducer.2. Remove plug on top of the manifold and install 016449 Adapter. See Illustration 1.
Illustration 1. Boost Line Rework3. Remove boost line from the end of the manifold, plugging the fitting with 9L8493 Cap.4. Install new hose and union between existing hose end and adapter. Secure boost line to compressor hose to avoid chafing.Throttle Position Sensor
Inspect the throttle linkage for loose, bent, broken, missing, or worn components. Also, check for interference with the linkage or spring. The throttle should work smoothly without excessive drag and return to low idle position without assistance in less than one second. Repair linkage as authorized by the OEM dealer.
Additional Reference:
2YG - SENR3913 Troubleshooting Guide, Procedure P-3037LG - SENR5112 Troubleshooting Guide, Procedure P-303Tool Requirements:
1 - 8T8697 Electronic Control Analyzer and Programmer1 - NEXG4522 3176 Engine SPM for 8T8697 ECAP1 - 8T5275 Harness1 - 8C9801 PWM Adapter Group1 - 8T8695 9 - Pin Breakout "T"Service Claim Allowances
Parts Disposition
Handle the parts in accordance with your Warranty Bulletin on