Caterpillar 3056 GEN SET ENGINE 7AK — Set The Top Center Compression Position By Reverse Pin Timing For No. 1 Piston
Adjustments · Fuel injection pump timing
For the Caterpillar 3056 GEN SET ENGINE 7AK, from the Caterpillar service manual.
Browse Caterpillar generators & specs →
Before you start
- Do not remove the hub nut from the shaft of the fuel injection pump. The hub is installed at the factory to ensure correct fuel pump timing position.
- Do not release the torx screws. If released and the timing plate is moved, the factory timing position will be lost.
Procedure
- Remove the fuel injection nozzles, the water pump, and the cover for the gear of the fuel injection pump.
- Rotate the crankshaft clockwise until the inlet valve on the No. 1 cylinder closes. Slowly rotate until the timing gear slot and the hub slot align with the hole in the pump body.
- Insert the timing pin through the timing gear and the slot in the hub. Push the pin into the hole in the pump body as far as possible. The engine is then at top center of No. 1 cylinder on the compres
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Slot is at the bottom for the Stanadyne fuel injection pump
- Slot is at the top for the Bosch fuel injection pump
- No resistance should be felt when the timing pin is inserted into the hole in the pump body
Source: Caterpillar service manual. Steps and values are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.