Engine:
Full coverage of M50B25 inline-six engine, including diagnostics, repair, and overhaul.
Fuel System:
Detailed information on fuel injection system (DME, injectors, fuel pump, regulator) and fuel tank.
Cooling System:
Radiator, water pump, thermostat, hoses, coolant specifications, and fan clutch.
Ignition System:
Ignition coils, spark plugs, DME control, and diagnostic procedures.
Exhaust System:
Exhaust manifolds, catalytic converter, mufflers, and oxygen sensors.
Transmission Manual:
Complete repair and overhaul procedures for Getrag 260 5-speed manual gearbox.
Transmission Automatic:
Repair and diagnostic procedures for ZF 4HP22/4HP24 automatic transmissions.
Drivetrain:
Driveshaft, universal joints, differential, axles, and wheel bearings.
Suspension Front:
MacPherson struts, control arms, sway bar, bushings, and alignment specifications.
Suspension Rear:
Multi-link independent rear suspension, shock absorbers, springs, bushings, and alignment.
Steering:
Power steering system (pump, rack, hoses), steering column, and alignment.
Brakes Front:
Ventilated disc brakes, calipers, pads, rotors, and fluid specifications.
Brakes Rear:
Solid disc brakes, calipers, pads, rotors, and parking brake.
ABS:
Antilock Braking System (ABS) components, diagnostics, and bleeding procedures.
Electrical System Overview:
Comprehensive wiring diagrams, fuse box locations, relay assignments, and electrical component testing.
Battery Charging:
Alternator, voltage regulator, battery specifications, and testing.
Lighting Exterior:
Headlights, taillights, turn signals, fog lights, bulb types, and wiring.
Lighting Interior:
Dome lights, instrument cluster illumination, and courtesy lights.
Instrument Cluster:
Speedometer, tachometer, fuel gauge, temperature gauge, warning lights, and diagnostics.
Climate Control:
HVAC system operation, blower motor, heater core, evaporator, A/C compressor, refrigerant, and diagnostics.
Body Exterior:
Body panel repair, door mechanisms, hood, trunk, bumpers, and glass replacement.
Body Interior:
Seat removal, dashboard disassembly, headliner, door panels, and trim components.
Chassis Frame:
Underbody structural components and corrosion protection.
Safety Restraints:
Seat belt operation and inspection (pre-tensioners not typically present on this model).
Routine Maintenance:
Oil changes, filter replacements, fluid checks and top-offs, spark plug replacement, belt inspection.
Engine Overhaul:
Detailed steps for engine disassembly, component inspection, reassembly, and break-in procedures.
Transmission Repair:
Complete procedures for clutch replacement, gearbox rebuild, and automatic transmission servicing.
Brake System Service:
Pad and rotor replacement, caliper service, brake fluid flush, and ABS bleeding.
Suspension Components:
Replacement of struts, shocks, control arms, bushings, ball joints, and tie rod ends.
Steering System Repair:
Power steering pump replacement, rack and pinion service, and alignment adjustments.
Electrical Troubleshooting:
Systematic diagnostic trees, fault code retrieval (where applicable), and component testing.
Diagnostics:
Fault finding for engine, transmission, ABS, and other key systems.
Wiring Diagrams:
Detailed, high-quality wiring schematics for all vehicle systems.
Body And Trim:
Removal and installation of interior and exterior body panels, trim pieces, and accessories.
Heating And Air Conditioning:
Service and repair of the climate control system, including leak detection and refrigerant handling.
Depth:
Comprehensive, covering everything from basic maintenance to complete engine and transmission overhauls.
Diagnostic Capability:
Advanced diagnostic procedures and troubleshooting guides for complex electrical and mechanical issues.
Rebuild Procedures:
Detailed instructions for rebuilding major components like engines, transmissions, and differentials.
Torque Specifications:
Essential torque values for all critical fasteners across various systems.
Clearances Tolerances:
Precise specifications for engine component clearances and assembly tolerances.
Oil Change Interval:
Every 7,500 - 10,000 miles or 12 months, using synthetic oil.
Spark Plug Replacement:
Approx. every 30,000-50,000 miles (depending on plug type; platinum/iridium recommended).
Coolant Flush:
Every 2-3 years or 30,000-50,000 miles.
Transmission Fluid Change:
Manual: Inspect and change as needed; Automatic: Every 50,000-70,000 miles is recommended.
Engine Oil:
BMW Longlife-01 (LL-01) compliant 5W-30 or 5W-40 Synthetic (or equivalent).
Coolant:
BMW Blue Antifreeze (G48) or equivalent Ethylene Glycol based coolant with corrosion inhibitors.
Brake Fluid:
DOT 4 Low Viscosity (LV) brake fluid.
Cooling System:
Plastic coolant expansion tank can become brittle and crack; water pump impeller can degrade.
Head Gasket:
M50 engine is generally robust, but head gasket issues can occur with overheating or high mileage.
Vacuum Leaks:
Age-related degradation of vacuum hoses can lead to rough idling and performance issues.
Oil Pan Gasket:
Common leak point due to age and material degradation.
Window Regulators:
Can become weak or fail over time.
ABS Sensor Ring:
Can corrode and fail, leading to ABS warning lights.
