BIT-END 6Y5839 - Caterpillar

3606 (8RB),
3608 (6MC),
3612 (9RC),
3616 (1PD) Engines In Heavy Fuel Oil (HFO) ApplicationsAt the beginning of 3600 Engine development, it was believed that a means was needed to prevent premature intake valve face wear (recession or loss of lash). Competitive engines at the time used an auxiliary pump to meter a small amount of oil into the intake manifold. Data at that time indicated that doing this slowed valve face wear. Since that time, the Oil Mister Pump has been a part of the 3600 Engine.
Laboratory test and field experience have shown that different base stock lube oils leave deposits on intake ports and inlet valves. These deposits can potentially damage the valve face by initiating a leak path which will eventually "gutter". The ingestion of lube oil is now considered undesirable for HFO applications and believed to have negative consequences. Therefore, the Oil Mister Pump has been removed from production on all 3600 Engines in HFO applications. Also, 3600 Customer Services recommends shutting off the oil mister pump(s) on existing 3600 Engines in HFO applications. Use the following procedure to disable the 7C-1190 Pump or Pumps.
3606, 3608, and 3612 Engines have one 7C-1190 Pump. 3616 Engines have two 7C-1190 Pumps.
Illustration 1.
Locations of components.
Illustration 2.
(SECTION X-X) Locations of components. 1. With the engine shut down, disconnect the lubrication lines (B) from the 7C-1190 Pump (A). As each lubrication line is disconnected, use 9L-8493 Caps and 9S-5518 Plugs to block of the lines and pump connections.2. Remove the two bolts (C) that fasten the pump (A) to the adapter (D). Remove the pump from the adapter.3. Remove the 7C-1642 Coupling (F).4. Be sure the O-ring seal (E) is in position adapter (D). Reinstall the pump (A) on the adapter (D) with two bolts (C). The lubrication lines (B) and pump ports should remain capped and plugged. If the mister lines are leaking, remove the lines. Leaking mister lines can result in a boost loss.