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HOMESERVICE MANUALSCHEVROLET1997CHEVY EXPRESS G3500, VAN CARGO, 6.5 FREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 19 (ENGINE CONTROLS - ADJUSTMENTS - 6.5L DIESEL)INJECTION PUMP TIMINGCHECKING/ADJUSTING INJECTION TIMING
1997 Chevrolet Chevy Express G3500, Van Cargo, 6.5 F

Checking/Adjusting Injection Timing

1997 Chevrolet Chevy Express G3500, Van Cargo, 6.5 FSECTION Checking/Adjusting Injection Timing
WARNING: This page does not describe the selected car, but rather 21 other vehicles, including the 1996 Chevrolet Chevy Van, 1995 GMC Yukon, 1995 GMC Vandura Special, 1995 GMC Vandura, and 1995 GMC Suburban. However, it is still accessible from the selected car via links, so may be relevant.

Original factory injection pump timing is marked with a static timing mark, a line scribed across both the pump mounting flange and the front cover. This static timing mark should be used as a reference. If timing mark is not present on mounting flange, scribe a line to assist in how far injection pump needs to be rotated.

  1. Start and warm engine to normal operating temperature. Connect Tech 1 scan tester. Set scan tester to OUTPUT TEST/INJ PUMP mode. Activate TDC TIME SET. The DESIRED INJ TIM value will read zero.
    NOTE: If engine stalls when TDC TIME SET is activated, turn engine off. Loosen injection pump nuts. Slightly rotate injection pump toward driver's side of vehicle. Tighten injection pump nuts. Repeat step 1).
  2. Ensure engine is running, then check "MEASURED INJ TIM" for proper timing specification. See INJECTION PUMP TIMING  below. If timing needs adjustment, turn engine off to avoid engine damage, then adjust injection pump. A 1-mm pump movement equals about 2 degrees timing.
INJECTION PUMP TIMING (DEGREES BTDC @ RPM)

Application Man. Trans. Auto. Trans.
6.5L (VIN F, P & S) 3.5 @ Idle 3.5 @ Idle
RENDER: 1.0x

NO RELATED

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Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.