Engine:
Detailed diagnostics, repair, and overhaul procedures for the M40B18 engine.
Fuel System:
Fuel injection system (Bosch Motronic), fuel pump, injectors, fuel filter, fuel pressure regulator.
Ignition System:
Ignition coil, spark plugs, distributor (if applicable to specific markets/builds), ignition timing.
Cooling System:
Radiator, water pump, thermostat, hoses, coolant specifications, bleeding procedures.
Exhaust System:
Exhaust manifold, catalytic converter, muffler, oxygen sensor diagnostics.
Transmission Manual:
Gearbox overhaul, clutch replacement, shift linkage adjustment, fluid specifications.
Transmission Automatic:
Automatic transmission service, fluid changes, torque converter, solenoids (if applicable).
Drivetrain:
Driveshafts, universal joints, differential, axle shafts, wheel bearings.
Suspension Front:
MacPherson struts, control arms, ball joints, sway bar, bushings, alignment specifications.
Suspension Rear:
Multi-link suspension (Z-axle), shock absorbers, springs, trailing arms, bushings, alignment specifications.
Steering:
Power steering system, steering rack, tie rods, steering column, fluid specifications.
Brakes Front:
Ventilated disc brakes, calipers, pads, rotors, brake fluid specifications, bleeding.
Brakes Rear:
Disc brakes, calipers, pads, rotors, parking brake mechanism, brake fluid specifications, bleeding.
Electrical System:
Battery, alternator, starter motor, wiring diagrams, fuses, relays.
Lighting System:
Headlights, taillights, interior lighting, bulb types and replacement.
Climate Control:
HVAC system, heater core, A/C compressor, refrigerant types, blower motor.
Body And Chassis:
Body panel removal/installation, door mechanisms, window regulators, sunroof (if equipped).
Interior:
Seat removal, dashboard disassembly, trim panel replacement.
Troubleshooting:
Diagnostic procedures for common problems, fault codes (OBD-I), symptom-based troubleshooting.
Preventative Maintenance:
Oil changes, filter replacements, fluid checks and top-offs, spark plug replacement, belt inspections.
Engine Repair:
Head gasket replacement, piston ring installation, valve stem seals, timing belt replacement (M40 is chain driven, but it will cover inspection).
Transmission Overhaul:
Complete rebuild procedures for both manual and automatic transmissions.
Brake Service:
Pad and rotor replacement, caliper rebuilding, brake line replacement.
Suspension Component Replacement:
Ball joint, control arm, shock absorber, and strut replacement.
Electrical Diagnosis:
Tracing wiring faults, testing sensors and actuators, charging system diagnosis.
Engine Diagnostics:
Using diagnostic tools (OBD-I), interpreting engine performance issues.
Tune Up Procedures:
Ignition timing adjustment, idle speed control, fuel mixture adjustment (if applicable).
Body Repair:
Dent repair, panel alignment, rust mitigation (limited scope usually).
Depth:
Comprehensive: Covers routine maintenance to complete engine and transmission rebuilds, including electrical troubleshooting and bodywork.
Diagnostic Focus:
Detailed focus on diagnosing issues using factory specifications and procedures.
Specification Detail:
Includes torque specifications, clearances, fluid capacities, and electrical resistance values.
Service Intervals Engine Oil
Interval:
Every 7,500 - 10,000 miles or 12 months, whichever comes first.
Service Intervals Oil Filter
Interval:
Change with every oil change.
Service Intervals Spark Plugs
Interval:
Every 30,000 miles (standard copper plugs).
Service Intervals Air Filter
Interval:
Every 15,000 - 30,000 miles or as needed based on driving conditions.
Service Intervals Coolant
Interval:
Flush and replace every 2-3 years or 30,000 miles.
Engine Oil:
SAE 10W-40 or 10W-30 (API SG or higher).
Coolant:
BMW Blue Antifreeze (Glysantin G48) or equivalent ethylene glycol-based coolant, mixed 50/50 with distilled water.
Cooling System:
Plastic coolant expansion tank can become brittle and crack; water pump plastic impeller can degrade.
Fuel System:
Crankshaft position sensor failure can lead to no-start conditions.
Suspension:
Vibrations from the driveshaft guibo (flex disc) and center support bearing; worn control arm bushings.
Electrical:
Corrosion on ABS sensors and wiring; micro-switches in door handles can fail.
Engine:
Oil leaks from valve cover gasket; rear main seal leaks.