Engine Mechanical:
Detailed breakdown of M30 engine (cylinder head, block, crankshaft, pistons, connecting rods, camshafts, timing system, oil pump, cooling system).
Engine Management:
Bosch L-Jetronic fuel injection system, ignition system, sensors, actuators, troubleshooting of fuel delivery and spark.
Transmission Manual:
Getrag 260 5-speed manual transmission overhaul, clutch, shifting mechanism.
Transmission Automatic:
ZF 4HP22 automatic transmission overhaul, torque converter, hydraulic control, electronic controls (if applicable to specific years/models).
Drivetrain:
Driveshaft, universal joints, rear axle assembly, limited-slip differential (if equipped).
Suspension Front:
MacPherson strut system, control arms, ball joints, bushings, sway bar, shock absorbers.
Suspension Rear:
Independent trailing arm suspension, shock absorbers, springs, bushings, sway bar.
Steering System:
Power assisted rack and pinion steering, hydraulic pump, steering gear, tie rods, steering column.
Brake System:
Front disc brakes (ventilated), rear disc brakes, ABS (Anti-lock Braking System) components and diagnosis, brake hydraulics, parking brake.
Electrical Starting Charging:
Starter motor, alternator, battery, wiring diagrams for starting and charging circuits.
Electrical Lighting:
Headlights, taillights, interior lighting, wiring diagrams.
Electrical Instruments Controls:
Dashboard instruments, gauges, switches, climate controls, power windows, power locks.
HVAC System:
Air conditioning system service, heating system, blower motor, controls, refrigerant handling.
Bodywork Exterior:
Door mechanisms, hood and trunk latches, bumpers, body panel removal and installation.
Bodywork Interior:
Seat removal, dashboard trim, headliner, door panels.
Routine Maintenance:
Oil changes, filter replacements, spark plug replacement, fluid checks and top-offs, lubrication points.
Engine Overhaul:
Complete engine disassembly, cleaning, inspection, and reassembly with torque specifications.
Transmission Repair:
Detailed steps for rebuilding both manual and automatic transmissions.
Brake Service:
Pad and rotor replacement, caliper servicing, bleeding the brake system, ABS component replacement.
Suspension Repair:
Replacement of ball joints, tie rod ends, control arm bushings, struts, and shocks.
Electrical Troubleshooting:
Use of wiring diagrams to diagnose faults in various electrical circuits.
Fuel System Diagnosis:
Testing fuel pressure, injector function, and diagnosing issues with the L-Jetronic system.
Ignition Timing Adjustment:
Procedures for setting and checking ignition timing.
Valve Adjustment:
Procedures for adjusting valve clearance on the M30 engine.
Cooling System Service:
Radiator, water pump, thermostat replacement, coolant flushes.
HVAC Service And Repair:
Refrigerant charging, component replacement (compressor, condenser, evaporator), leak detection.
Depth:
Comprehensive from basic maintenance to complete engine and transmission rebuilds, including diagnostic procedures and wiring diagrams.
Oil Change:
Typically every 5,000-7,500 miles or 6-12 months, depending on driving conditions.
Transmission Fluid:
Manual: Check level periodically, change if recommended by service advisor or if experiencing issues. Automatic: typically around 30,000-60,000 miles for fluid and filter change.
Spark Plugs:
Every 30,000-60,000 miles, depending on plug type (copper vs. platinum).
Coolant:
Flush and refill every 2-3 years or 30,000-50,000 miles.
Engine Oil:
API SG/SH, SAE 15W-40 or 20W-50 (check owner's manual for specific recommendations and viscosity based on climate).
Coolant:
BMW Blue or equivalent ethylene glycol-based antifreeze, mixed 50/50 with distilled water.
Transmission Fluid Manual:
GL-4 gear oil, SAE 75W-90.
Transmission Fluid Automatic:
Dexron III or equivalent ATF.
Brake Fluid:
DOT 3 or DOT 4 brake fluid.
Common Problems:
Cooling system leaks (hoses, radiator), fuel distributor issues, idle control valve problems, heater core leaks, worn suspension bushings, electrical gremlins common in older vehicles, ABS sensor failures.
