COVER (compressor) 6N7697 - Caterpillar

This procedure must be followed carefully if the fuel injection pump: * is to be replaced* performance is not correct* locking screw is released after the pump is removed from the engine.These engines operate at a static timing very close to top center (TC).When the piston is close to (TC) there is a relatively large movement of the crankshaft for only a small movement of the piston.When the piston is further down the cylinder, there is a relatively small movement of the crankshaft for a large movement of the piston. Therefore greater accuracy is possible. For this reason the crankshaft is set at 100° before (TC).Use 127-1069 Timing Pin (1) to accurately set the piston to 100° before (TC).
Timing Pin
(1) 127-1069 Timing pin.1. Remove the fuel lines from the number 1 nozzle.2. Loosen the bolts that hold the nozzles.3. Remove the nozzle together with its seat washer from number 1 cylinder.4. Remove the whistle from the 127-1069 Timing Pin. Install 127-1069 Timing Pin (1). If the timing pin will not seat, rotate the engine crankshaft 180°. Put the nozzle clamp on the pin and tighten the bolts gradually and evenly to 12 N m (9 lb ft). Install the whistle to 127-1069 Timing Pin (1).
Be sure that the piston comes lightly into contact with the timing pin, or both the piston and the pin could be damaged.
5. Slowly rotate the crankshaft clockwise, from the front, until the piston just comes into contact with timing pin (1). The engine will now be set at 100° before (TC). If the whistle was heard slightly before contact was made with the pin, you are on the compression stroke. If not, remove the pin, rotate the crankshaft about 270° clockwise from the front. Install the pin and clamp, and slowly rotate the crankshaft until contact is made between the piston and pin. A whistle should be heard this time. The whistle confirms the engine is on the compression stroke.6. Loosen the locking screw and position the spacer so that the locking screw will not tighten on it. Tighten the locking screw to 10 N m (7 lb ft). Check that the spacer is free to move. The pump is now locked.
Use a second wrench to prevent movement of the high-pressure outlet when the union nut for each high-pressure pipe is loosened.
7. Remove the pipes, the cables and the connection for the cold start device from the fuel pump. Loosen the nuts on the pump flange.8. Remove the four bolts that hold the gear cover. Remove the gear cover from the timing case cover. Loosen the nut which retains the drive gear of the pump one to two turns.9. Install the 8S2264 Puller Group and loosen the gear on the drive shaft of the pump. Remove the puller group. Remove the nut and the spring washer from the shaft of the fuel pump.
Do not turn the crankshaft when the pump is not on the engine; the loose fuel pump gear may damage