1999/10/01 Caterpillar

3606 (8RB1-Up),
3608 (6MC1-Up),
3612 (9RC1-Up, 9FR13-Up),
3616 (1PD1-Up, 1FN138-Up) Engines

Formerly, cleaning the aftercooler core on these engines was done at hourly intervals. A new method is now available to more accurately determine when the aftercooler core should be cleaned. This new method uses a differential pressure gauge to measure the boost pressure before and after the aftercooler core. When the differential pressure reaches 8 inches of water at full rated power, the aftercooler core should be cleaned.

Failure to clean the aftercooler core when the air side differential pressure reaches 8 inches of water will result in excessive internal restriction to air flow. This restriction will not register on the typical air inlet restriction gauge, which is in the mechanical gauge panel. This air flow restriction can result in elevated exhaust temperatures, increased fuel consumption, and power loss. Long term engine reliability can also be compromised.

The 152-2067 Differential Pressure Gauge is available to measure the differential pressure across the air side of the aftercoolers on these engines. The differential pressure measurement lines can be installed on the aftercooler housing before and after the core.

NOTE: The use of this differential pressure method to determine when to clean the aftercooler core is particularly important for engines using the new 130-6261 High Performance Aftercooler (HPAC).

Illustration 1.
Locations to connect differential pressure gauge between.

9/16-18 Thread Port (A).

3/4-16 Thread Port (B).

Illustration 2.
Locations to connect differential pressure gauge between.

9/16-18 Thread Port (C).

3/4-16 Thread Port (D).