Engine Controls - Adjustments - 6.5l Diesel Chevrolet Cab & Chassis K3500

ENGINE MECHANICAL

Note. The Assembly Line Data Link (ALDL) connector may also be referred to as the Data Link Connector (DLC) and the SERVICE ENGINE SOON (SES) light may also be referred to as the Malfunction Indicator Light (MIL).

Before performing any on-vehicle adjustments to fuel or ignition systems, ensure engine mechanical condition is okay.

VALVE CLEARANCE

Note. All models use hydraulic lifters. No adjustments are required.

INJECTION PUMP TIMING

Note. For injection pump timing with Tech 1 scan tool, refer to INJECTION PUMP TIMING ADJUSTMENT in the 6.5L V8 DIESEL & TURBO DIESEL - VINS [F,P,S,Y] article in ENGINE MECHANICAL section.

1. Original factory injection pump timing is set by using dynamic timing mark (a circle scribed across both pump flange and front housing) or static timing mark (straight line scribed across both pump flange and front housing). NOTE: A service/replacement pump will not be marked with dynamic timing mark (circle) and should be timed using the static timing mark (line).
2. To properly set timing, 2 halves of dynamic timing mark (circle) or static timing mark (line) must be aligned. Engine must not be running while injection timing is set.
3. Check alignment of injection pump timing marks on top of engine front cover and injection pump flange. If timing marks are not aligned, loosen 3 retaining nuts and align mark on injection pump with mark on front cover. Tighten nuts to 30 ft. lbs. (41 N.m). Adjust throttle linkage.

Curb Idle

Set parking brake and block drive wheels. Warm engine to normal operating temperature. Install Tachometer (J-26925). Ensure air cleaner is in place and all accessories are turned off. Adjust curb (low) idle speed to specifications by turning curb idle speed screw on fuel injection pump. (Scheme 1) See IDLE SPEED (RPM).

Fast Idle

1. Set parking brake and block drive wheels. Warm engine to normal operating temperature. Install Tachometer (J-26925). Ensure air cleaner is in place and all accessories are turned off.
2. Remove connector from fast idle solenoid. (Scheme 1) To energize solenoid, connect jumper wire from battery positive terminal to fast idle solenoid terminal. Open throttle momentarily to energize and fully extend fast idle solenoid plunger.
3. Adjust extended fast idle solenoid plunger by turning plunger hex head to obtain fast idle speed. See «IDLE SPEED (RPM)»(/chevrolet/cab-chassis-k3500/1989-2000/remont/adjustments/#engine-controls-adjustments-65l-diesel). Turn off engine. Remove jumper wire and test equipment. Install fast idle solenoid connector.

IDLE SPEED (RPM)

Scheme 1

THROTTLE POSITION (TP) SENSOR

Note. On 6.5L Diesel, TP sensor has been replaced by a non-adjustable Accelerator Pedal Position (APP) module. APP signals PCM which signals fuel solenoid driver and fuel injector control. Throttle control is thus electronic with NO mechanical link from engine to pedal.

See also:
• 6.5L V8 DIESEL & TURBO DIESEL - VINS [F,P,S,Y]
• IDLE SPEED (RPM)