The 1986 Jeep Comanche is a compact pickup truck featuring 2WD and 4WD configurations, available with 2.5L 4-cylinder or 2.8L V6 engines, manual or automatic transmissions, and payload capacities up to 2,205 lbs. This service manual covers maintenance procedures, specifications, troubleshooting, and repair instructions for all major systems including engine, transmission, drivetrain, brakes, suspension, electrical, and body components.
Complete technical specifications for 1986 Jeep Comanche models.
| Specification | Description |
|---|---|
| Engine Options | 2.5L I4 (150 CID), 2.8L V6 (173 CID) |
| Transmission | 4-speed manual, 5-speed manual, 3-speed automatic |
| Drivetrain | 2WD, 4WD (Command-Trac) |
| Wheelbase | 113.0 inches (short bed), 119.6 inches (long bed) |
| Payload Capacity | 1,100 to 2,205 lbs |
| Fuel Capacity | 18.5 gallons |
| Towing Capacity | 2,000 to 4,000 lbs (with proper equipment) |
| Brake System | Front disc, rear drum with power assist |
| Suspension | Front: independent, Rear: leaf springs |
| GVWR | 4,200 to 5,200 lbs |
Service procedures for 2.5L I4 and 2.8L V6 engines.
WARNING! Always disconnect battery before servicing engine components. Allow engine to cool before opening cooling system.
Manual and automatic transmission service procedures.
CAUTION! Use proper jack stands when working under vehicle. Ensure transmission is in park or neutral with parking brake engaged.
Front suspension: independent with torsion bars. Rear: leaf springs.
Steering: Recirculating ball type, power steering available.
Alignment Specifications: Toe-in: 1/8" ± 1/16", Camber: 0° ± 1°, Caster: 1.5° ± 1°. Wheel bearing adjustment: Pre-load 17-25 in-lbs while rotating. Torsion bar adjustment: Measure ride height before adjustment. Ball joint inspection: Check for vertical play. Shock absorber replacement: Always replace in pairs.
12-volt negative ground system. Battery: Group 58, 60 amp-hour.
Tip: Always disconnect battery before performing electrical work to prevent shorts.
Body construction: Steel cab with separate bed.
WARNING! Use proper support when removing heavy components like seats or bed. Wear safety glasses when working with glass.
Recommended service intervals for optimal performance.
| Interval | Service Items |
|---|---|
| 3,000 miles | Oil and filter change, tire rotation |
| 6,000 miles | Lube chassis, check brake system |
| 15,000 miles | Replace air filter, check wheel bearings |
| 30,000 miles | Replace fuel filter, coolant flush |
| 60,000 miles | Timing chain inspection, transmission service |
Common problems and diagnostic procedures.
| Symptom | Possible Cause | Corrective Action |
|---|---|---|
| Engine won't start | Fuel, spark, or compression issue | Check fuel delivery, spark plugs, compression test |
| Overheating | Coolant leak, thermostat, water pump | Pressure test system, check thermostat operation |
| Brake pull | Stuck caliper, contaminated linings | Inspect calipers, replace brake pads/shoes |
| 4WD not engaging | Vacuum system, shift linkage | Check vacuum lines, adjust shift linkage |
| Electrical issues | Ground connections, alternator | Test battery, check grounds, alternator output |
Essential safety procedures for all service work.
Manufacturer-issued updates and corrections.
TSB 86-01: Revised carburetor adjustment procedure for high-altitude operation. TSB 86-07: Updated transmission shift linkage adjustment. TSB 86-15: Brake pedal travel measurement procedure. TSB 86-22: 4WD engagement system vacuum line routing update. For latest TSBs, contact Jeep dealership or service center.
Service Support: Contact Jeep customer service at 1-800-JEEP-USA or visit authorized dealership for technical assistance.