2012/11/09 Caterpillar

Engine:

G3412 (S/N: GNA1-UP; KAP1-UP)

Description of Change: The following improvements make the jacket water heater groups 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 have fixed operating temperatures. 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.

The improvements are effective with the following serial numbers:

• GNA00124

• KAP00990

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