2013/07/22 Caterpillar

Caterpillar Products: Machine Engines

All 3500 Series

Description of Change: The new bolts used for the oil scavenge pump are longer for more thread engagement and have a higher tensile strength.

Adaptable To:

Illustration 1	g03351082
(1) 3H-2750 Bolt (2) 5J-4715 Washer

Note: For more details refer to the Disassembly and Assembly, "Engine Oil Scavenge Pump - Install".The 4F-9351 Special Bolt is being replaced with bolt (1) and washer (2) .

The following procedure covers the installation of the new bolt and washer.

1. Drain the oil from the engine and oil pan.

2. Remove the oil pan bolts and oil pan from the engine.

3. Remove 4F-9351 Special Bolts and replace with bolt (1) and washer (2). Replace one bolt at a time to ensure that the pump stays in alignment and will not have to be removed.

   Note: Do not torque the new bolt and washer until all of the original bolts are replaced.

4. Torque bolts (1) to 50 N·m (37 lb ft).

ReferenceRefer to Disassembly and Assembly, SENR1126, "Engine Oil Scavenge Pump - Install" for further instructions.Table 1 contains the part numbers for the new and previous parts. The new parts are effective in 3500 machine engines built after 26June 2013. The new parts are adaptable for machine engines back to first production.