2012/10/22 Caterpillar

Engine:

G3512E (S/N: SSR1-UP; NGS1-UP)

G3516B (S/N: ZBB1-UP)

G3516B SI TA (S/N: CSC1-UP)

G3516B (S/N: ZBC1-UP)

G3516B SI TA (S/N: CME1-UP)

G3516C (S/N: GSB1-UP)

G3516C SI TA (S/N: TJB1-UP)

G3516C (S/N: GZC1-UP; GZZ1-UP)

G3516E (S/N: GAS1-UP)

G3520B SI TA (S/N: CWD1-UP)

G3520B (S/N: GZP1-UP)

G3520C (S/N: GZA1-UP; GZB1-UP; GZJ1-UP; GZK1-UP; GZL1-UP; GZM1-UP; GZN1-UP; RLP1-UP; LGS1-UP)

G3520C SI TA (S/N: CWW1-UP)

G3520E (S/N: GZE1-UP; GZH1-UP)

Description of Change: The following improvements have been made to make the jacket water heater group more robust:

• The new jacket water heater pumps utilize an o-ring face connection. The improved connection at the pump reduces the risk for jacket water leaks.

• Increased flow of the jacket water heater pump.

• The new thermostats used in the improved system are fixed. The former thermostats were adjustable. Fixed thermostats are more durable than the adjustable thermostats.

• The wattage rating of the new heating element is increased.

• The size of the control box has been increased to provide more area for components and connections.

• The control box contactor design is more robust than the previous design.

• The control box is now mounted on vibration isolators to reduce damage to the control box components.

• The hose groups have been rerouted to improve flow.

Adaptable To: The improved parts listed below are adaptable back to first production of the serial numbers listed above.

Refer to Table 1 for the new parts.

Refer to Table 16 for effective serial numbers.

Illustration 1	g03250317
(1) O-ring face fitting (2) Vibration isolators