Insert the timing pin (1) through the slot for the timing
gear (5). Continue to insert the timing pin through the
slot for the hub (6). Push the pin all the way into the
hole of the pump body (4). If the pin can be inserted all
the way, the pump timing is correct. Resistance should
not occur until the pin is inserted all the way into the
hole of the pump body.
Remove the timing pin.
If the timing pin cannot be inserted all the way into the
hole of the pump body, perform the following function:
Ensure that the engine is correctly set at the top center
position of the number one cylinder on the compression
The fuel pump must be set by a Caterpillar Dealer when
the following conditions exist:
The engine is set correctly at the top center.
The pin cannot be easily inserted.
The pin cannot be inserted all the way into the hole of
the pump body.
Refer to Disassembly And Assembly, "Fuel Injection Pump" for
removal and installation procedures.
Remove Air From The Fuel System
Remove Air From The Fuel System On Type
1 Engines and 9RM Engines
For a complete description of Type 1 and Type 2
engines, refer to the Systems Operation, Testing
and Adjusting Module, "Engine Design" for more
If air enters the fuel system, the air must be purged before the
engine can be started.
Air can enter the fuel system when any of the following events
The fuel tank is drained during normal operation.
The low pressure fuel lines are disconnected.
A par of the low pressure fuel system leaks during
The fuel filter is replaced.
Use the following procedure in order to remove air from the
(1) Vent plug
(2) Fuel filter base
Loosen the vent plug (1) on top of fuel filter base (2).
(3) Fuel transfer pump
Operate the priming lever on the bottom of the fuel
transfer pump (3) until fuel, which is free of air, flows
from the vent plug. Tighten the vent plug.
If the drive cam of the fuel transfer pump is at
maximum lift, the priming lever cannot be
operated. The crankshaft must be rotated one