Engine Mechanical:
Complete overhaul, disassembly, assembly, inspection, and adjustment procedures for the M30B30 engine.
Engine Management:
Fuel injection system (Bosch Motronic), ignition system, emissions control, sensors, actuators, and troubleshooting diagnostic codes.
Transmission Manual:
Service and repair of the Getrag 260 5-speed manual transmission, clutch system, driveshaft, and differential.
Transmission Automatic:
Service and repair of the ZF 4HP22 automatic transmission, including valve body, torque converter, and electronic controls.
Suspension Steering:
Front and rear suspension components (struts, shocks, control arms, bushings), power steering system, steering rack, and alignment.
Brakes:
Front and rear brake systems (discs, calipers, pads, lines), ABS (Anti-lock Braking System) components and diagnostics, parking brake.
Electrical System:
Complete wiring diagrams, fuse box layout, battery, alternator, starter, lighting systems, power windows, locks, mirrors, and comfort electronics.
Body And Chassis:
Body panel repair, doors, hood, trunk, bumpers, glass replacement, interior trim, and structural components.
Heating Ventilation Air Conditioning:
HVAC system operation, components (compressor, condenser, evaporator, blower motor), refrigerant service, and climate control diagnostics.
Routine Maintenance:
Oil changes, filter replacements, spark plug service, coolant flush, belt inspection/replacement, and fluid checks.
Troubleshooting Diagnostics:
Step-by-step diagnostic procedures for common problems, fault code interpretation, and symptom-based troubleshooting.
Engine Rebuilding:
Detailed instructions for engine disassembly, cleaning, inspection, machining, and reassembly, including torque specifications and clearances.
Transmission Repair:
Procedures for transmission overhaul, clutch replacement, and common automatic transmission repair issues.
Brake System Overhaul:
Replacement of brake pads, rotors, calipers, master cylinder, and bleeding procedures. ABS component replacement and bleeding.
Electrical Component Replacement:
Guidance on replacing starters, alternators, fuel pumps, ignition coils, and various sensors.
Suspension And Steering Repair:
Replacement of ball joints, tie rod ends, control arms, struts, and shock absorbers. Steering rack overhaul.
Body Panel And Trim Replacement:
Instructions for removing and installing body panels, doors, and interior trim pieces.
Depth:
Comprehensive, covering everything from basic scheduled maintenance to complete engine and transmission rebuilds, including electrical diagnostics.
Target Audience:
Professional mechanics and experienced DIY enthusiasts.
Transmission Type:
5-speed Manual Transmission (Getrag 260)
Transmission Type:
4-speed Automatic Transmission (ZF 4HP22)
Clutch Type:
Hydraulically operated single-plate dry clutch (for manual).
Automatic Features:
Electronically controlled, sport/economy mode selector.
Manual Transmission Fluid:
GL-4 Gear Oil (e.g., BMW MTF LT-2 or equivalent, consult manual for exact spec).
Automatic Transmission Fluid:
Dexron III or equivalent (BMW ATF LT 71141 is often specified, verify with manual).
Oil Change Interval:
Every 7,500-10,000 miles (12,000-16,000 km) or annually, whichever comes first (check manual for exact recommendation).
Spark Plug Replacement:
Typically every 30,000 miles (48,000 km) for standard spark plugs, or longer for platinum/iridium plugs if fitted.
Coolant Flush Interval:
Every 2-3 years or 30,000 miles (48,000 km).
Coolant Type:
BMW Blue Antifreeze/Coolant or equivalent silicate-free, ethylene glycol-based coolant (50/50 mix with distilled water).
Brake Fluid Type:
DOT 4 brake fluid.
Power Steering Fluid Type:
ATF Dexron II/III or specific BMW power steering fluid (check manual).
Engine M30:
Oil leaks from valve cover gasket and oil pan gasket, potential head gasket issues with high mileage or poor maintenance, cooling system component failure (water pump, thermostat, hoses).
Electrical:
Corrosion in wiring harnesses, failing fuel pump relays, OBC (On-Board Computer) issues, headlamp leveling system failures.
Suspension:
Worn front control arm bushings, sagging rear springs, worn shock absorbers, steering box wear.
Body:
Rust in common areas like wheel arches, rocker panels, and around the sunroof/windscreen.