Category Archives: GM 6.5

GM/Detroit 6.5L DIESEL EMISSIONS – VACUUM PUMP

A vacuum pump is located on the front right side of the engine and provides a vacuum source to operate the EGR system for the light duty naturally aspirated engine (L49, VIN P) and air conditioning servos (if equipped) (figure 4).  

GM/Detroit 6.5L DIESEL EMISSIONS – CRANKCASE VENTILATION SYSTEM

The crankcase ventilation system is designed to reduce the crankcase pressure at idle. This lower presĀ­sure reduces engine oil leaks. The system consists of a crankcase depression regulator valve located on the right valve cover (figure 1). The crankcase depression regulator (CDR) valve is used to regulate the flow of crankcase gases back into theā€¦ Read More »

GM/Detroit 6.5L – GENERATOR REPLACEMENT

The removal and installation instructions serve only as a guide. Additional operations may be required on some vehicles to remove other equipment to gain access to the generator, drive belt, and brackets. CAUTION: Failure to observe step 1 in this procedure may result in an injury from the hot battery lead at the generator. Removeā€¦ Read More »

GM/Detroit 6.5L – GENERATOR BENCH TEST

This test requires both a fully charged battery and a generator test stand to operate the generator. 1. Make connect i ons as shown in figure 4, except leave the carbon pile turned off. The ground polariĀ­ty of the generator and battery must be the same. The battery must be fully charged. Use a 30ā€¦ Read More »

GM/Detroit 6.5L – DIAGNOSTIC TEST FOR CS-130

Tool Required: J 39200 Digital Multimeter 1. Check the belt for wear and tension. Refer to SECĀ­TION 6B1 for belt diagnosis. Check the wiring. 2. With the ignition switch on and the engine off, the lamp should be on. If not, detach the wiring harĀ­ness at the generator and use a fused jumper wire (Jā€¦ Read More »

GM/Detroit 6.5L – CIRCUIT DIAGNOSIS

Trouble in the charging system will show up as one or more of the following conditions: ā€¢ Abnormal indicator lamp operation. ā€¢ A high or low voltage indication with the engine running and all accessories off. ā€¢ An undercharged battery as evidenced by slow cranking or a dark hydrometer. ā€¢ An overcharged battery as evidencedā€¦ Read More »

GM/Detroit 6.5L – ELECTRICAL TESTS

Before performing the diagnosis procedures on the vehicle, make sure the system wiring is good and the belt is not slipping. Also, the battery must be fully charged for a valid test of the charging system. NOTICE: To avoid damage to the vehicle electrical system, observe the following preĀ­ cautions: ā€¢ Do not polarize theā€¦ Read More »

GM/Detroit 6.5L – NOISY GENERATOR

Noise from a generator may be caused by a loose drive pulley, loose mounting bolts, worn or dirty bearĀ­ings, worn stator, or worn rectifier bridge. If the pulley and mounting bolts are snug and the noise continues, replace the generator. Refer to ā€œGenerator ReplaceĀ­ment.ā€ Do not disassemble the generator. Separating the end frames will damageā€¦ Read More »

GM/Detroit 6.5L – CS-130 GENERATOR

The CS-130 (figure 1) generator features a high ampere output per pound of weight The CS stands for charging system and 130 is the measurement in milliĀ­meters of the outside diameter of the stator laminations. This generator with integral regulator does not have a diode trio. The delta stator, rectifier bridge, and rotor with slipā€¦ Read More »

GM/Detroit 6.5L – STARTER MOTOR REPLACEMENT

Remove or Disconnect (Figures 12, 13,-14, and 15) 1. Negative battery cable. Refer to CAUTION on page 6D2-1. 2. Starter brackets and/or shields, if equipped. 3. Wires from the starter solenoid. 4. Two bolts and washers (where present) holding the starter to the engine. 5. Starter from the engine. Install or Connect (Figures 12, 13,ā€¦ Read More »