Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSGMC1991JIMMY 5.7 K, AUTOMATIC, 4L60/MD8REPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCEREMOVE, OVERHAUL & INSTALLENGINE CONTROLS - REMOVE/INSTALL/OVERHAULIGNITION SYSTEMDISTRIBUTORDISASSEMBLY & REASSEMBLY
1991 GMC Jimmy 5.7 K, Automatic, 4L60/MD8
Disassembly & Reassembly
1991 GMC Jimmy 5.7 K, Automatic, 4L60/MD8SECTION Disassembly & Reassembly
- Disassembly procedure is not available from manufacturer. See Fig 1-7 for exploded views of distributors.
- When reassembling, ensure pick-up assembly arm is correctly installed on pin. If not, arm can float and cause ignition timing to vary. To prevent corrosion, lubricate terminals with petroleum jelly before installation.
- To prevent heat damage, coat bottom of module and module rest pad in housing with silicone grease. Before installing roll pin in driven gear, ensure timing mark on roll pin and rotor tip align. See Fig 1-7.
RENDER: 1.0x
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When to See a Mechanic
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.