See Figures 1 and 2
For the diesel engine's fuel injection system to be properly timed, the marks on the top of the engine front cover (8-379) or injection pump adapter (8-350) must be aligned with the marks on the injection pump flange. The engine must be off when the timing is reset.
On 49 state 8-379s, the marks on the top of the engine front cover are scribe lines. On California 8-379s, the marks are half-circles.
- Loosen the three pump retaining nuts. If the marks are not aligned, adjustment is necessary.
- Loosen the three pump retaining nuts. Special Tool #J-26987 is useful here on the 8-350.
- Align the mark on the injection pump with the mark on the front cover (8-379) or adapter (8-350). Tighten the nuts to 30 ft. lbs. on the 8-379, and 35 ft. lbs. on the 8-350.
Use a3/4 inch open-end wrench on the nut at the front of the injection pump to aid in rotating the pump to align the marks.
- Adjust the throttle linkage if necessary.