Engine Mechanical:
Engine overhaul, piston and connecting rod assembly, crankshaft and main bearings, cylinder head, cylinder head gasket, camshafts, timing chain/belt, valve timing, oil pump, lubrication system, cooling system, fuel system (mechanical and electronic components), exhaust system.
Engine Electrical:
Engine management system (DME), ignition system, fuel injection system, starter motor, alternator, sensors (crankshaft position, camshaft position, oxygen, knock, MAF, MAP, throttle position), wiring diagrams.
Transmission Manual:
Clutch, gearbox overhaul, gear selection, drive shafts, universal joints, differentials.
Transmission Automatic:
Automatic transmission overhaul, torque converter, valve body, hydraulic systems, electronic control unit (EGS), fluid changes and checks.
Suspension And Steering:
Front and rear suspension components (struts, shocks, springs, control arms, bushings), power steering system, steering rack, steering column, wheel alignment specifications.
Brakes:
Brake system components (calipers, rotors, pads, lines), hydraulic system, ABS (Anti-lock Braking System) operation and diagnosis, parking brake.
Electrical System:
Battery, charging system, starter motor, lighting system (headlights, taillights, interior lights), fuses, relays, wiring harnesses, power windows, central locking, sunroof, horn, wipers, washer system.
HVAC:
Heating, ventilation, and air conditioning (HVAC) system, refrigerant handling, blower motor, climate control unit, cabin air filter replacement.
Body And Chassis:
Body panel removal and installation, doors, hood, trunk, bumpers, interior trim, glass, rust prevention and repair, chassis lubrication.
Diagnostics And Troubleshooting:
Diagnostic trouble codes (DTCs), diagnostic procedures, testing of electrical components, mechanical troubleshooting guides.
Routine Maintenance:
Oil and filter changes, air filter replacement, spark plug replacement, fluid level checks and top-offs (coolant, brake fluid, power steering fluid, transmission fluid), tire rotation and pressure checks.
Engine Repair:
Engine rebuilds, gasket replacement (head gasket, intake manifold gasket, exhaust manifold gasket), timing belt/chain service, water pump replacement, oil pump replacement, piston ring replacement.
Transmission Repair:
Manual and automatic transmission overhaul, clutch replacement, torque converter replacement, transmission fluid and filter service.
Suspension And Steering Repair:
Shock absorber and strut replacement, control arm bushing replacement, ball joint replacement, tie rod end replacement, steering rack rebuild/replacement.
Brake System Repair:
Brake pad and rotor replacement, brake caliper overhaul/replacement, brake line replacement, bleeding the brake system, ABS component diagnosis and replacement.
Electrical System Diagnosis:
Troubleshooting electrical faults, testing sensors and actuators, wiring harness repair, component replacement (alternator, starter, ignition coils, fuel injectors).
HVAC System Service:
Refrigerant recharge, leak detection, component replacement (compressor, condenser, evaporator, blower motor), cabin filter replacement.
Bodywork And Trim:
Body panel alignment, door mechanism repair, window regulator replacement, interior panel removal and installation.
Diagnostic Testing:
Interpreting diagnostic trouble codes (DTCs), performing specific diagnostic tests for various systems.
Depth Of Coverage:
Comprehensive, from basic maintenance to complete engine and transmission overhauls, including detailed electrical system diagnosis and repair. Suitable for professional mechanics and advanced DIY enthusiasts.
M43B18 (For 318I):
1.8L Inline-4, ~113 hp @ 5500 rpm, ~129 lb-ft torque @ 4300 rpm
M50B25/M52B25 (For 325I/325Is):
2.5L Inline-6, ~189 hp @ 6000 rpm, ~181 lb-ft torque @ 4200 rpm (M50B25); ~190 hp @ 5900 rpm, ~181 lb-ft torque @ 4200 rpm (M52B25)
M50B28/M52B28 (For 328I/328Is):
2.8L Inline-6, ~190 hp @ 5300 rpm, ~206 lb-ft torque @ 3950 rpm (M50B28 - rare); ~193 hp @ 5300 rpm, ~206 lb-ft torque @ 3950 rpm (M52B28)
S50B30/S50B32 (For M3):
3.0L Inline-6 (S50B30 US spec) ~240 hp @ 6000 rpm, ~225 lb-ft torque @ 4500 rpm; 3.2L Inline-6 (S50B32 Euro spec) ~321 hp @ 7400 rpm, ~258 lb-ft torque @ 3250 rpm; (S50B32 US spec - S52B32) ~240 hp @ 6000 rpm, ~236 lb-ft torque @ 4400 rpm
Engine Type:
Inline-4 (318i), Inline-6 (323i, 325i, 328i, M3)
Valvetrain:
DOHC (Double Overhead Camshaft), 4 valves per cylinder
Fuel Delivery:
Multi-point fuel injection (Bosch Motronic system)
Fuel Type:
Premium Unleaded Gasoline (91 RON or higher recommended)
Ignition System:
Distributorless ignition (DIS) or coil-on-plug (depending on specific engine and year)
Oil Change Interval:
Typically every 7,500 - 10,000 miles (12,000 - 16,000 km) or annually, depending on driving conditions and oil used. Consult the manual for exact intervals.
Spark Plug Replacement:
Spark plugs typically recommended for replacement every 30,000 - 60,000 miles (48,000 - 96,000 km), depending on plug type (standard, platinum, iridium).
Coolant Flush:
Coolant replacement typically recommended every 2 years or 30,000 miles (48,000 km).
Engine Oil Type:
SAE 5W-30, 5W-40, or 10W-40 synthetic or semi-synthetic oil meeting BMW Longlife-98 or similar specifications. Check manual for exact viscosity and specification.
Coolant Type:
BMW Blue or BMW Green Antifreeze/Coolant (ethylene glycol based), mixed 50/50 with distilled water.
Brake Fluid Type:
DOT 4 brake fluid.
Power Steering Fluid:
Pentosin CHF 11S or equivalent hydraulic fluid.
Transmission Fluid Manual:
SAE 75W-90 or 75W-80 GL-4 or GL-5 gear oil.
Transmission Fluid Automatic:
ZF LifeguardFluid5 or equivalent ATF (Automatic Transmission Fluid).
Cooling System:
Plastic coolant expansion tanks are prone to cracking; water pumps and thermostats can fail. Vanos (Variable Valve Timing) seals can degrade, leading to rough idle and power loss, especially on M50/M52 engines.
Suspension:
Worn control arm bushings (bushings often fail prematurely), sagging rear springs, worn shock absorbers.
Electrical:
ABS wheel speed sensors fail, heater control valve leaks, OBC (On-Board Computer) pixelation, door panel vapor barrier leaks leading to water intrusion.
Engine:
Oil leaks from valve cover gaskets and oil pan gaskets are common. Vacuum leaks can cause rough idle. Crankshaft position sensor failures can cause no-start conditions.
Interior:
Headliner sagging, door panel "sag," worn seat bolster fabric.