Segment:
Compact Executive Sports Sedan
Target Audience:
Enthusiasts seeking to maintain and repair their classic BMW 3 Series.
Competitors:
Mercedes-Benz W123 series, Audi 80/90, Alfa Romeo Alfetta.
Vehicle Philosophy:
Sporty handling, driver-focused interior, reliable performance.
Benefit:
Empowers owners and mechanics with comprehensive, accurate information for DIY repairs and professional servicing.
Delivery:
Instant download eliminates shipping costs and delays, providing immediate access to critical repair data.
Engine Mechanical:
Complete overhaul procedures, cylinder head, block, crankshaft, camshaft, pistons, connecting rods, timing system, oil pump.
Fuel System:
Fuel injection (Bosch L-Jetronic), fuel pump, fuel filter, fuel lines, injectors, fuel pressure regulator.
Ignition System:
Spark plugs, ignition coils, distributor, ignition timing, electronic ignition control.
Cooling System:
Radiator, thermostat, water pump, coolant hoses, fan, temperature sensor.
Exhaust System:
Exhaust manifolds, catalytic converter (if applicable for later models), muffler, pipes, hangers.
Transmission Manual:
Clutch operation, gearbox overhaul, gear selection linkage, driveshafts.
Transmission Automatic:
Torque converter, hydraulic control, planetary gearsets, valve body, transmission fluid and filter changes.
Drivetrain:
Differential, rear axle, wheel bearings.
Suspension Front:
MacPherson struts, control arms, ball joints, steering knuckles, springs, shock absorbers.
Suspension Rear:
Trailing arms, coil springs, shock absorbers, anti-roll bar.
Steering System:
Steering rack, tie rods, steering column, power steering pump (if equipped).
Brakes Front:
Ventilated disc brakes, calipers, brake pads, brake lines, master cylinder.
Brakes Rear:
Disc brakes, calipers, brake pads, brake lines, parking brake mechanism.
Electrical System:
Battery, alternator, starter motor, wiring diagrams, fuses, relays, lighting system, dashboard instruments.
Body And Chassis:
Body panel removal and installation, structural components, doors, windows, locks, interior trim.
HVAC System:
Heating system, ventilation, blower motor, heater core, control cables.
Preventive Maintenance:
Oil changes, filter replacements, tune-ups, fluid checks and top-offs, belt inspections.
Troubleshooting:
Diagnostic charts for common problems, symptom-based troubleshooting guides.
Component Repair Overhaul:
Detailed step-by-step instructions for rebuilding or replacing major components.
Diagnostic Procedures:
Engine timing adjustments, fuel system pressure testing, electrical system continuity checks.
Wiring Diagrams:
Comprehensive electrical schematics for various systems.
Depth:
Comprehensive coverage from basic maintenance to full engine and transmission rebuilds, including detailed diagnostics.
Oil Change:
Every 5,000 - 7,500 miles or 6-12 months, whichever comes first (depending on driving conditions).
Spark Plugs:
Inspect every 15,000 miles, replace as needed (recommend Bosch W7DC or equivalent).
Timing Belt Chain:
M20 engines use a timing chain, designed for the life of the engine; inspect tensioner and guides periodically.
Coolant Flush:
Every 2 years or 30,000 miles.
Engine Oil:
API SG or higher, SAE 15W-40 or 20W-50 (check owner's manual for specific viscosity recommendations based on climate).
Coolant:
BMW Blue Antifreeze/Coolant (50/50 mix with distilled water) or equivalent ethylene glycol-based coolant.
Brake Fluid:
DOT 3 or DOT 4.
Transmission Fluid Manual:
API GL-4 SAE 75W-90 gear oil.
Transmission Fluid Automatic:
Dexron III / Mercon ATF (or equivalent).
Rust Corrosion:
Common rust areas include wheel arches, rocker panels, strut towers, and around the windshield/rear window seals.
Engine Oil Leaks:
Valve cover gasket, oil pan gasket, and front crankshaft seal can be prone to leaks.
Cooling System Aging:
Hoses can become brittle, radiator may develop leaks, and the thermostat housing can corrode.
Fuel System Degradation:
Fuel lines can degrade, and the L-Jetronic system may require occasional injector cleaning or sensor testing.
Suspension Wear:
Bushings, ball joints, and tie rod ends can wear out over time, affecting handling and alignment.
Electrical Contact Issues:
Corrosion or degradation of electrical connectors and grounds can lead to intermittent system failures.
