Injection Timing: Adjusting
- Shut off engine. Note position of marks on pump flange and pump intermediate adapter (V6) or pump adapter (V8). Loosen bolts or nuts holding pump to adapter until pump can be rotated.
- Place an offset open end wrench (1" on V6, 3/4" on V8) on boss at front of injection pump. Rotate pump to left to advance or to right to retard timing as necessary.
- On V6 models, the width of mark on intermediate adapter is about 2/3°. On V8 models, the width of mark on adapter is about 1°. Move pump the amount that is needed and tighten pump retaining nuts to 35 ft. lbs. (48 N.m) on V6 or 18 ft. lbs. (24 N.m) on V8.
- Start engine and recheck timing reading as outlined previously. Reset and recheck timing if necessary. On V8 models, adjust pump rod. On all models, reset fast and curb idle speeds. See appropriate TUNE-UP article.
NOTE:
Sooty or dirty probes will result in retarded readings. The luminosity probe will soot up very fast when used in cold engine. Wild needle fluctuations on timing meter indicate a cylinder not firing properly. Correct this condition prior to timing adjustment.