Positioning:
The BMW 7 Series (E23) represented the pinnacle of BMW's luxury sedan offerings in the 1980s, competing with established luxury marques like Mercedes-Benz and Jaguar. This manual caters to owners and technicians dedicated to maintaining these sophisticated vehicles.
Comparison Points:
The E23 7 Series was lauded for its driving dynamics and technological advancements for its era, often outperforming its rivals in sporty feel. This manual reflects the complexity and precision engineering inherent in BMW vehicles of this period.
Manual Strengths:
Unparalleled detail for the E23 generation, covering both 733i and 735i models. Essential for accurate diagnosis and repair of BMW's robust M30 engines and complex electrical systems.
Primary Coverage:
Mechanical Repair, Electrical Diagnosis, Maintenance, Troubleshooting, Overhaul, Restoration
Specific Systems Covered:
Engine, Fuel System, Ignition System, Cooling System, Exhaust System, Clutch, Transmission (Manual & Automatic), Drivetrain, Suspension, Steering, Brakes, Electrical System, HVAC, Bodywork, Body Electronics
Type:
Digital Workshop Repair Manual
Format:
Digital (likely PDF)
Powertrain:
Detailed coverage of M30 inline-six engines, including fuel injection (Bosch Motronic), ignition timing, emissions control, and component testing.
Drivetrain:
Comprehensive guides for manual and automatic transmissions, driveline components, rear axle differentials, and driveshaft maintenance.
Chassis:
In-depth information on front and rear suspension systems, power steering, brake system components (including ABS where applicable), and wheel alignment.
Electrical:
Extensive wiring diagrams, diagnostic procedures for the entire electrical system, including engine management, lighting, instrument cluster, and comfort features.
Maintenance:
Routine maintenance tasks, fluid changes (oil, coolant, brake fluid, transmission fluid), filter replacements, spark plug service, and lubrication points.
Diagnostics:
Step-by-step diagnostic trees for common and complex issues, troubleshooting guides for drivability problems, electrical faults, and HVAC malfunctions.
Repair Rebuild:
Detailed instructions for engine overhaul, transmission rebuild, brake caliper service, suspension component replacement, and body panel repair.
Component Installation:
Guidance on installing new or reconditioned components, including torque specifications and proper procedures for critical items like cylinder heads and differentials.
Depth:
Expert-level detail suitable for professional mechanics and dedicated DIY enthusiasts. Covers everything from basic adjustments to complete engine rebuilds and complex electrical diagnostics.
File Type:
Likely PDF, optimized for digital viewing and printing.
Searchability:
Typically includes text-searchable capabilities for quick information retrieval.
Scalability:
High-resolution diagrams and illustrations, allowing for clear viewing and printing of intricate details.
Binding:
Not Applicable (Digital Format)
Paper Quality:
Not Applicable (Digital Format)
Engine Type 733I:
M30B32 inline-six, naturally aspirated
Engine Type 735I:
M30B34 inline-six, naturally aspirated
Displacement 733I:
3.2 liters (3210 cc)
Horsepower 733I Approx:
197 hp @ 5500 rpm
Torque 733I Approx:
210 lb-ft @ 3500 rpm
Displacement 735I:
3.4 liters (3430 cc)
Horsepower 735I Approx:
218 hp @ 5400 rpm
Torque 735I Approx:
232 lb-ft @ 3600 rpm
Fuel Injection:
Bosch Motronic (various versions depending on year and market)
Fuel Type:
Unleaded Gasoline
Engine Architecture:
SOHC (Single Overhead Camshaft) inline-six cylinder
Engine Management System:
Motronic ECU controlling fuel injection and ignition timing
Transmission Type Std:
4-speed manual transmission (Getrag 265)
Transmission Type Opt:
3-speed or 4-speed automatic transmission (ZF 4HP22)
Automatic Features:
Sport/Economy modes on later 4-speed automatics.
Manual Transmission Fluid:
GL-4 Gear Oil (e.g., Castrol EPX 80W/90 or equivalent)
Automatic Transmission Fluid:
Dexron III (or equivalent) for ZF 4HP22
Wheelbase:
approx. 116.4 inches (2957 mm)
Length:
approx. 199.8 inches (5075 mm)
Width:
approx. 70.5 inches (1791 mm)
Height:
approx. 55.2 inches (1402 mm)
Curb Weight:
approx. 3700-3900 lbs (1680-1770 kg)
Gross Vehicle Weight Rating:
approx. 4750 lbs (2155 kg)
Crash Testing Era:
While formal NCAP ratings as we know them today were not prevalent, the E23 was built with significant safety considerations for its time.
ABS:
Anti-lock Braking System (ABS) optional on some models, standard on later ones.
Traction Control:
Not typically available on this generation.
Seatbelts:
Three-point inertia-reel seatbelts front and rear.
Crumple Zones:
Designed with energy-absorbing front and rear crumple zones.
Steering Column:
Collapsible steering column for improved occupant protection.
Audio System:
Factory-installed premium audio systems, often with cassette player and equalizer.
Climate Control:
Automatic climate control (HVAC) was a significant feature for its era, managing cabin temperature and air distribution.
Cruise Control:
Standard cruise control system.
Onboard Computer:
Early forms of onboard computers offering basic diagnostics and trip information.
Connectivity Features:
Limited by modern standards; primarily focused on internal vehicle systems. May include basic telephone preparation on some models.
Oil Change:
Typically every 3,000-5,000 miles or 6-12 months, depending on driving conditions. Consult manual for specific recommendations.
Spark Plugs:
Every 15,000-30,000 miles, depending on type (conventional, platinum). Consult manual for specific type and gap.
Coolant Flush:
Every 2-3 years or 30,000-50,000 miles. Use correct BMW coolant type.
Transmission Service:
Automatic transmission fluid and filter change every 30,000-60,000 miles. Manual transmission fluid typically checked, replaced as needed or at higher mileage intervals.
Engine Oil:
API SG or SH, SAE 20W-50 or 15W-40 recommended for typical operating temperatures. Consult manual for precise viscosity and quantity.
Coolant:
Ethylene Glycol based antifreeze, mixed 50/50 with distilled water. Use BMW-approved coolant or equivalent. Check manual for specific type.
Brake Fluid:
DOT 4 specification.
Engine Reliability:
M30 engines are generally robust but can suffer from oil leaks (valve cover gasket, oil pan gasket), cooling system issues (radiator, water pump, hoses), and fuel system component wear (fuel pump, injectors).
Electrical Gremlins:
Common electrical issues include failing ABS sensors/control units, aged wiring insulation, dashboard warning lights, and problems with central locking or power accessories.
Suspension Wear:
Worn control arm bushings, ball joints, and shock absorbers are common due to age and mileage, affecting ride quality and handling.
Body Rust:
Vulnerable areas for rust include wheel arches, rocker panels, and around window seals. Proper preventative maintenance is crucial.
Bmw Philosophy:
BMW's long-standing reputation for building driver-focused, high-performance luxury vehicles.
E23 Introduction:
The E23 was the successor to the E12 5 Series and was BMW's first true full-size luxury sedan, introducing advanced features and setting a benchmark for handling in its class.
E23 Updates:
Received mid-cycle updates including engine larger displacements (735i), ABS, and improved interior amenities.
Successor:
The E23 was succeeded by the E32 7 Series in 1987.
Production Years:
1977-1986
Manufacturing Locations:
Germany (primarily Dingolfing plant)
Industry Acclaim:
The E23 7 Series was widely praised for its engineering, comfort, and driving dynamics, solidifying BMW's position in the luxury segment.
Vehicle Reviews Era:
Contemporary automotive press often highlighted its blend of performance and luxury, though it was sometimes seen as a sportier alternative to more traditional luxury sedans.
