Injection Pump Timing

Align timing marks ("V" and pointer) on front cover and crankshaft pulley at TDC for No. 1 cylinder. Remove valve cover and ensure No.1 cylinder is at TDC of compression stroke.
To adjust, remove injection lines. Turn cold start device linkage clockwise. Insert .60" (15 mm) block of wood between cold start device and linkage. See Fig 1 . Remove plug bolt from rear of injection pump and install dial indicator. Loosen pump and bracket bolts.

Fig 1: Wood Block Installation on Sentra Diesel Place wood block between cold start device and linkage.
Turn crankshaft counterclockwise 15-20° from TDC of No. 1 cylinder. Zero dial indicator. Turn crankshaft clockwise until No. 1 cylinder is at TDC. Observe dial indicator. Rotate pump body until indicator reading is .037" (.94 mm). Rotate pump clockwise to increase indicator reading and counterclockwise to decrease indicator reading. See Fig 2 .

Fig 2: Sentra Diesel Injection Timing Rotate pump until indicator reading is .037" (.94 mm).
Tighten injection pump and bracket bolts. Remove dial indicator and replace plug bolt gasket. Reconnect injection lines.