Engine:
Engine mechanical, lubrication, cooling, fuel delivery, ignition, exhaust, emission controls, engine management systems.
Transmission:
Manual and automatic transmissions, transfer case, driveline components (driveshafts, U-joints, differentials).
Brakes:
Brake system hydraulics, discs, drums, parking brake, ABS (if equipped).
Suspension:
Front and rear suspension systems (leaf springs, coil springs, solid axles, control arms, shocks, steering linkage).
Steering:
Power steering system, steering column, steering gear/rack.
Electrical:
Battery, charging system, starting system, lighting, instruments, gauges, body electrical, wiring diagrams.
Body:
Body panels, interior trim, doors, windows, seats, HVAC system, exterior trim.
Maintenance:
Scheduled maintenance intervals, fluid checks and changes, filter replacements, lubrication.
Diagnostics:
Troubleshooting guides for common issues, diagnostic trouble codes (DTCs), symptom-based diagnostics.
Repair:
Detailed step-by-step repair procedures for all major vehicle systems, including component removal, disassembly, reassembly, and installation.
Specifications:
Torque specifications, clearances, measurements, and tolerances for all components.
Engine Rebuild:
Detailed procedures for engine disassembly, inspection, component replacement, and reassembly, including piston ring end gap, bearing clearances, and valve train setup.
Transmission Overhaul:
Procedures for removing, disassembling, inspecting, repairing, and reinstalling both manual and automatic transmissions and transfer cases, including torque converter replacement and valve body diagnostics.
Electrical Diagnostics:
Comprehensive wiring diagrams for all circuits, fuse/relay locations, diagnostic flowcharts for electrical issues, and procedures for testing alternators, starters, sensors, and actuators.
Suspension Alignment:
Specifications and procedures for front-end alignment (caster, camber, toe), steering system adjustments, and suspension component replacement.
Body And Trim:
Procedures for removing and installing interior panels, headliner, door panels, exterior trim pieces, bumpers, and glass.
Torque Specs:
Extensive listing of all critical torque specifications for engine, drivetrain, suspension, chassis, and brake components.
Depth:
Comprehensive, covering everything from basic tune-ups to complete engine and transmission overhauls, including electrical system troubleshooting and body repair.
Cherokee Xj Engine Options:
2.5L AMC I4 (e.g., 150 cu in), 4.0L AMC I6 (e.g., 242 cu in), 4.2L AMC I6 (early models).
Wrangler Yj Engine Options:
2.5L AMC I4 (e.g., 150 cu in), 4.0L AMC I6 (e.g., 242 cu in), 4.2L AMC I6 (early models).
4.0L I6 Horsepower Range:
177-190 hp (depending on year and specific calibration)
4.0L I6 Torque Range:
220-245 lb-ft (depending on year and specific calibration)
Fuel Injection Type:
Multi-point Fuel Injection (MPI) for most XJ/YJ models, with early YJs potentially having Throttle Body Injection (TBI) or carburetion.
Cherokee Xj Standard Transmission:
AX-5 5-speed manual (typical for 4-cyl and some 6-cyl models)
Wrangler Yj Standard Transmission:
AX-5 5-speed manual (common for 2.5L), AX-15 5-speed manual (common for 4.0L)
Cherokee Xj Optional Transmission:
AW-4 4-speed automatic, AX-15 5-speed manual (more robust, common with 6-cyl)
Wrangler Yj Optional Transmission:
30RH 3-speed automatic (common for 4.0L, later models may have 4-speed automatics like 42RE).
Transfer Case:
NP231 (Command-Trac) or NP242 (Selec-Trac) for Cherokee XJ; NP231 (Command-Trac) for Wrangler YJ.
Oil Change Interval:
Typically every 3,000-5,000 miles or 6 months (refer to specific year for exact recommendation, synthetic oil may extend intervals).
Spark Plug Replacement:
Every 30,000-60,000 miles depending on spark plug type (copper, platinum, iridium).
Coolant Flush:
Every 30,000-50,000 miles or 2-3 years.
Engine Oil 4.0L:
API SJ or SL rated, SAE 10W-30 or 10W-40 recommended. Capacity: 5 quarts (with filter).
Transmission Fluid Aw4:
Dexron III (or equivalent like Mercon/ATF+4, though Dexron III is primary). Capacity: ~8-9 quarts for torque converter refill.
Transfer Case Np231:
ATF+4 (or Dexron III/Mercon for older spec). Capacity: 2 pints (approx).
Differential Fluid:
API GL-5, SAE 80W-90 (conventional or synthetic) for both front and rear axles. Capacity varies by axle type (e.g., Dana 30/35).
Cherokee Xj Common Issues:
Head gasket failures (especially on early 4.0L), cracked cylinder heads (later 4.0L), rust (rocker panels, floor pans, unibody), rear main seal leaks, transmission cooler line leaks, water pump leaks.
Wrangler Yj Common Issues:
Rust (body tub, frame, fender flares), leaf spring issues, transmission synchro wear (manual), death wobble (due to steering/suspension wear), overheating (especially 4.0L under load), aging electrical connectors.
Jeep Legacy:
Jeep has a long history of producing rugged, capable off-road vehicles, starting with military vehicles in WWII.
Cherokee Xj Debut:
Introduced in 1984, the XJ was a groundbreaking compact SUV, pioneering the unibody construction for its class, offering comfort and capability.
Wrangler Yj Debut:
Introduced in 1987 as the successor to the CJ series, the YJ retained traditional body-on-frame construction and leaf springs, but featured updated styling (including the controversial rectangular headlights) and improved amenities.
Cherokee Xj Production Years:
1984-2001 (North America)
Wrangler Yj Production Years:
1987-1995
