Category Archives: GM 6.5

GM/Detroit 6.5L ENGINE CONTROLS – EGR Valve Replacement

Removal Procedure 1. Remove the upper intake manifold cover by loosening the four mounting bolts. 2. Remove the vacuum hose from the EGR valve (2). 3. Remove the EGR valve mounting bolts (1). 4. Remove the EGR valve (2) and the gasket (3). Installation Procedure 1. Install the EGR valve (2) and gasket (3). Notice… Read More »

GM/Detroit 6.5L ENGINE CONTROLS – Glow Plug Relay Replacement

Removal Procedure 1. Remove the negative battery cables. 2. Release the wiring harness connector at the glow plug relay. 3. Remove the glow plug wiring harness nuts and harness. 4. Remove the relay mounting nuts. 5. Remove the glow plug relay by lifting it off the mounting studs. Installation Procedure 1. Install the glow plug… Read More »

GM/Detroit 6.5L ENGINE CONTROLS – Crankshaft Position Sensor Replacement

Removal Procedure 1. Remove the negative battery cables. 2. Remove the sensor electrical connector. 3. Remove power steering pump. Refer to Power Steering Pump Replacement (6.5L) in Power Steering. 4. Remove the sensor mounting bolt. 5. Remove the sensor from engine. Important: Care must betaken when handling the sensor. Damage to the sensor will affect… Read More »

GM/Detroit 6.5L ENGINE CONTROLS – Engine Oil Pressure Sensor/Switch Replacement

Removal Procedure 1. Remove the fuel manager/filter. Refer to Fuel Manager/Filter Replacement. 2. Disconnect the electrical connector. 3. Remove the switch (1). installation Procedure 1. Install the switch (1). 2. Reconnect the electrical connector. 3. Install the fuel manager/filter. Refer to Fuel Manager/Filter Replacement. 4. Bleed the fuel system. Refer to Fuel Feed and Fuel… Read More »

GM/Detroit 6.5L ENGINE CONTROLS – Injection Line(s) Replacement

Removal Procedure Tools Required J 39664 Manifold Cover Set Important: Clean all the line fittings that will be loosened or removed. 1. Remove the negative battery cables. 2. Remove the intake manifold. Refer to Intake Manifold Removal. Important: Before any further service work is to be done, cover the intake ports with the J 39664… Read More »

GM/Detroit 6.5L ENGINE CONTROLS – TDC Offset Adjustment

Tools Required • J 41089 Injection Pump Wrench • J 29872-A Injection Pump Adjustment Tool Important: Do not perform this procedure when only an injection pump has been replaced (refer to Injection Timing Adjustment). This procedure should only be used when a DTC has directed you to do so, or one of the following repairs… Read More »