Years Covered:
1955, 1956, 1957, 1958, 1959, 1960, 1961, 1962, 1963, 1964, 1965, 1966, 1967, 1968, 1969, 1970, 1971, 1972, 1973, 1974, 1975
Type:
Service Repair Manual
Engine Mechanical:
Detailed overhaul procedures, component testing, specifications, and troubleshooting for F-Head Hurricane I6 and other applicable engines.
Engine Electrical:
Ignition system, starting and charging systems, wiring diagrams, component testing, and diagnostics.
Transmission:
Service and repair of manual transmissions (e.g., T90, T86), transfer cases, and related driveline components.
Fuel System:
Carburetor service and adjustment (e.g., Carter WCFB, Rochester B), fuel pump, fuel lines, and fuel tank.
Brake System:
Drum brake overhaul, hydraulic system components (master cylinder, wheel cylinders), parking brake, and bleeding procedures.
Steering System:
Steering gearbox service, linkage inspection and adjustment, and power steering components (if applicable).
Suspension System:
Front and rear leaf spring systems, shock absorbers, bushings, and chassis lubrication.
Electrical System Body:
Lighting systems, wipers, horn, instrumentation, heating system, and related body electrical components.
Body And Frame:
Body panel removal and installation, frame inspection and repair, doors, hood, tailgate, and interior trim.
Cooling System:
Radiator, water pump, thermostat, hoses, and cooling fan service.
Exhaust System:
Muffler, exhaust pipes, and manifold service.
Routine Maintenance:
Oil changes, filter replacements, fluid checks, lubrication, tune-ups, and belt adjustments.
Engine Overhaul:
Complete engine disassembly, inspection, repair, and reassembly procedures.
Transmission Rebuild:
Step-by-step instructions for disassembling, repairing, and reassembling manual transmissions and transfer cases.
Brake Service:
Brake shoe replacement, drum machining, cylinder rebuild, and hydraulic line replacement.
Electrical Troubleshooting:
Diagnostic charts and procedures for common electrical faults.
Suspension Repair:
Leaf spring replacement, shock absorber installation, and chassis component servicing.
Steering Adjustment:
Alignment checks, steering box adjustments, and tie rod end replacement.
Body Panel Alignment:
Guidelines for adjusting doors, hood, and tailgate for proper fit and function.
Depth:
Comprehensive, covering everything from basic maintenance to in-depth engine and transmission overhauls.
Engine Code:
F-Head Hurricane
Engine Type:
Inline 6-Cylinder, Overhead Valve (OHV)
Displacement:
229.6 cubic inches (3.76 Liters)
Bore X Stroke:
3.3125 inches x 3.25 inches
Compression Ratio:
Approx. 7.1:1
Horsepower:
Approx. 105-115 hp @ 3600-4000 RPM (varies by year and tune)
Torque:
Approx. 180-190 lb-ft @ 1200-1800 RPM (varies by year and tune)
Carburetor:
Typically Carter WCFB or Rochester B series two-barrel downdraft carburetor.
Fuel Type:
Regular Unleaded Gasoline (octane requirements may vary)
Transmission Type:
Manual
Transfer Case:
2-speed manual transfer case (e.g., Dana 18, Dana 20)
Optional Transmission:
Early models may have offered different manual gearboxes, but the T90 3-speed manual was common. Later CJ-6s might have received updated transmissions.
Gear Ratios Example:
T90 3-speed manual typically: 1st: 2.53:1, 2nd: 1.55:1, 3rd: 1.00:1. Transfer case ratios varied but commonly included a low range of around 1.97:1 or 2.46:1.
Manual Transmission Fluid:
GL-4 or GL-5 gear oil, typically SAE 80W-90 or SAE 90.
Transfer Case Fluid:
Similar to manual transmission fluid, GL-4 or GL-5 gear oil, SAE 80W-90 or SAE 90.
Wheelbase:
104 inches (2642 mm)
Length:
Approx. 164-170 inches (4166-4318 mm) (depending on body style and bumpers)
Width:
Approx. 67-70 inches (1702-1778 mm)
Height:
Approx. 70-75 inches (1778-1905 mm) (depending on top and tires)
Curb Weight:
Approx. 3,000 - 3,400 lbs (1361 - 1542 kg)
Payload Capacity:
Approx. 1,000 - 1,500 lbs (454 - 680 kg)
Towing Capacity:
Varies, but generally capable of towing significant loads for its class.
Crash Safety:
No formal crash test ratings available for this era of vehicle. Safety features were basic by modern standards.
Braking System:
Hydraulic drum brakes on all four wheels.
Steering Type:
Recirculating ball steering (manual, power steering optional/later models).
Seat Belts:
Standard lap belts, shoulder belts became more common later in the production run or as an option.
Windshield:
Laminated safety glass (standard).
Roll Over Protection:
Minimal; relies on chassis strength and optional roll bars.
Oil Change Interval:
Every 3,000-5,000 miles or 6 months, whichever comes first (using appropriate oil viscosity).
Transmission Fluid Change:
Check fluid level regularly. Drain and refill every 24,000-30,000 miles or as per manual recommendations.
Differential Fluid Change:
Check fluid level regularly. Drain and refill every 24,000-30,000 miles.
Tune Up Schedule:
Spark plugs, points, and condenser typically every 6,000-12,000 miles. Carburetor adjustment as needed.
Engine Oil Type:
SAE 10W-30 or 10W-40 (API Service Classification SF or SG, depending on era and availability). Consult manual for exact recommendations.
Coolant Type:
Ethylene glycol based antifreeze (50/50 mix with distilled water).
Brake Fluid Type:
DOT 3 or DOT 4 hydraulic brake fluid.
Chassis Grease:
Lithium-based multipurpose grease (NLGI #2).
Rust And Corrosion:
Common on floor pans, rocker panels, and body mounts due to age and exposure.
Leaf Spring Sag:
Springs can fatigue and sag over time, affecting ride height and handling.
Carburetor Issues:
Wear and tuning problems with older carburetors can lead to poor idling and performance.
Electrical Gremlins:
Aging wiring harnesses, switches, and connections can cause intermittent electrical faults.
Engine Oil Leaks:
Common from valve cover gaskets, oil pan gaskets, and rear main seals on high-mileage engines.
Jeep Legacy:
Jeep has a long history of producing rugged, off-road capable vehicles, dating back to its military origins in World War II.
Cj Series Evolution:
The CJ-6 is an extended-wheelbase variant of the popular CJ-5, offering more passenger and cargo space. It shared many mechanical components with its shorter sibling.
Production Span:
1955-1975
Manufacturing Location:
United States (Toledo, Ohio)
Key Changes Over Years:
Engine options, transmission updates, minor styling tweaks, and the introduction of more creature comforts (like improved seats and heating) over its long production life.
