2009/03/09 Caterpillar

Engine:

3508 (S/N: 23Z1-UP; 70Z1-UP)

3508B (S/N: S2A1-UP; S2B1-UP; S2D1-UP; S2E1-UP; S2F1-UP; 3DM1-UP; 7SM1-UP; 3DW1-UP)

3508C (S/N: TTA1-UP; TTB1-UP)

3512 (S/N: 50Y1-UP; 24Z1-UP; 66Z1-UP; 67Z1-UP)

3512B (S/N: NSC1-UP; S2G1-UP; S2H1-UP; S2J1-UP; S2K1-UP; S2L1-UP; S2M1-UP; 7HM1-UP; 8EM1-UP; S2N1-UP; 4TN1-UP; 1PW1-UP; 2EZ1-UP)

3512C (S/N: TTC1-UP; TTE1-UP; TTF1-UP; MRG1-UP; TTG1-UP; MKH1-UP; SLM1-UP; E3W1-UP; E3X1-UP; E3Y1-UP)

3516 (S/N: 25Z1-UP; 29Z1-UP; 72Z1-UP; 73Z1-UP)

3516B (S/N: B5G1-UP; 7RN1-UP; 8KN1-UP; 9AN1-UP; S2P1-UP; S2R1-UP; S2S1-UP; S2T1-UP; S2W1-UP; 2FW1-UP; 4BW1-UP; S2X1-UP; S2Y1-UP)

3516C (S/N: TTD1-UP; PAG1-UP; TTH1-UP; TTJ1-UP; JTS1-UP)

Description of Change: An improved auxiliary sea water pump for 3500 Engines incorporates several changes that are utilized in order to improve sealing and the retention of the impeller. The improvements include the following:

• Improved silicon carbide on the silicon carbide water seal

• Improved retention and sealing of the oil seal's collar with two radial setscrews rather than Loctite

• Improved retention of the impeller for priming utilizing tapered locking rings.

• Improved retention of the centrifugal impeller by utilizing a heavier press fit

Adaptable To: The new 318-2579 Auxiliary Sea Water Pump Gp is a direct replacement for both the 148-8000 Auxiliary Sea Water Pump Gp and the 144-6080 Auxiliary Sea Water Pump Gp, which are cancelled. The new auxiliary sea water pump is adaptable to the serial numbers that are listed above, back to first production.