BMW 740i 740iL 1991 Full Service Repair Manual

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🏷️ Basic Information Identification Make: BMW Model: 740i / 740iL Year: 1991 Codes Chassis Code: E32 👋 Introduction Market Position Vehicle Segment: Full-size Luxury Sedan Brand Perception: BMW's flagship model,...

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标签: 1991 740i 740iL BMW Car Cars Misc

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Description

🏷️ Basic Information

Identification

Make:

Model:

740i / 740iL

Year:

Codes

Chassis Code:

👋 Introduction

Market Position

Vehicle Segment:

Full-size Luxury Sedan

Brand Perception:

BMW's flagship model, known for performance, luxury, and advanced engineering for its era.

Competitive Analysis

Key Competitors:

Mercedes-Benz S-Class (W140), Audi V8 quattro, Lexus LS 400.

Key Features

Engine Technology:

Introduction of the M60 V8 engine, a significant technological leap for BMW's larger sedans.

Body Styles:

Available in standard wheelbase (740i) and long wheelbase (740iL) for enhanced rear passenger space.

Technological Advancements:

Early adoption of advanced electronics, including CAN bus architecture, integrated diagnostics, and sophisticated climate control.

📋 Manual Details

Coverage Areas

Manual Type:

Full Service and Repair Manual

Language:

English

Format:

Digital (likely PDF)

📖 Manual Coverage

Systems Covered

Engine Management:

Detailed diagnosis and repair of DME (Digital Motor Electronics), sensors, actuators, fuel injection, ignition timing.

Engine Mechanical:

Complete overhaul procedures for the M60B40 V8 engine, including cylinder head, block, crankshaft, pistons, connecting rods, timing chain, and lubrication system.

Transmission:

Repair and overhaul of the 4HP22EH automatic transmission, including valve body, torque converter, clutch packs, and electronic control.

Suspension:

Front and rear suspension components, including struts, shocks, control arms, bushings, springs, and self-leveling rear suspension (SLS).

Brakes:

Front and rear brake systems, including ABS (Anti-lock Braking System), calipers, rotors, pads, brake lines, and hydraulic control unit.

Electrical System:

Comprehensive wiring diagrams, component location, troubleshooting of lighting, power windows, mirrors, locks, climate control, instrument cluster, and battery management.

Body And Interior:

Panel replacement, door mechanisms, interior trim removal and installation, seat adjustments, sunroof operation.

Procedures Included

Routine Maintenance:

Oil changes, filter replacements, spark plug replacement, coolant flushes, drive belt inspection and replacement.

Diagnostic Procedures:

Troubleshooting common drivability issues, electrical faults, and component failures using diagnostic codes and systematic checks.

Component Rebuild:

Detailed step-by-step instructions for rebuilding the engine, transmission, and major mechanical assemblies.

Alignment And Suspension Adjustment:

Specifications and procedures for wheel alignment and adjustment of suspension components.

Climate Control Repair:

Diagnosis and repair of HVAC system, including compressor, evaporator, condenser, blower motor, and refrigerant handling.

Technical Depth

Depth Of Coverage:

Comprehensive, covering from basic maintenance to full engine and transmission rebuilds, including advanced diagnostics and component-level repair.

📊 Manual Specifications

File Format

File Type:

Likely PDF, optimized for digital viewing and printing.

Searchability:

Text-searchable, allowing quick access to specific topics and components.

Print Quality

Image Resolution:

High-resolution diagrams and illustrations for clarity.

Binding Type

Binding:

N/A (Digital Format)

Paper Type

Paper Quality:

N/A (Digital Format)

⚙️ Engine Specifications

Primary Engine

Engine Code:

M60B40

Engine Type:

4.0L (3982 cc) Naturally Aspirated V8

Bore X Stroke:

89 mm x 79 mm

Compression Ratio:

10.0:1

Performance

Horsepower:

282 hp @ 5800 rpm

Torque:

295 lb-ft @ 4500 rpm

Fuel System

Fuel Delivery:

Multi-point fuel injection (Bosch Motronic M3.3)

Fuel Type:

Unleaded Premium (91 octane recommended)

Engine Components

Block Material:

Aluminum

Cylinder Head Material:

Aluminum

Valvetrain:

Dual Overhead Camshafts (DOHC), 4 valves per cylinder

Timing Drive:

Timing Chain (dual row for critical components)

🔧 Transmission

Standard

Transmission Type:

4-speed Automatic (ZF 4HP22EH)

Optional

Optional Transmission:

None offered for 740i/740iL in 1991.

Features

Shift Modes:

Standard/Sport (S/M) mode selection for altered shift points.

Transmission Fluid Type:

BMW ATF LT-2 (or equivalent like Dexron II-E)

Fluid Capacity

Transmission Fluid Capacity:

Approximately 8.0 liters (dry fill)

📐 Dimensions

Exterior

Length 740I:

5024 mm (197.8 inches)

Length 740Il:

5124 mm (201.7 inches)

Wheelbase 740I:

2945 mm (115.9 inches)

Wheelbase 740Il:

3070 mm (120.9 inches)

Width:

1800 mm (70.9 inches)

Height:

1410 mm (55.5 inches)

Weights

Curb Weight 740I:

Approx. 1850 kg (4079 lbs)

Curb Weight 740Il:

Approx. 1900 kg (4189 lbs)

Cargo

Trunk Volume:

Approx. 500 liters (17.6 cu ft)

🛡️ Safety Features

Ratings

Crash Test Data:

Limited official NHTSA/IIHS data for this specific model year; focus on structural integrity and passive safety systems of the era.

Active Features

Standard Anti-lock Braking System (ABS).

Traction Control:

Optional ASC (Automatic Stability Control) available on some models.

Passive Features

Airbags:

Driver's side airbag standard; passenger airbag optional or phased in during the model year.

Seatbelts:

Three-point seatbelts with pretensioners for front occupants.

Structural Reinforcement:

Reinforced chassis, safety cell construction, and impact-absorbing crumple zones.

💡 Technology Features

Infotainment

Audio System:

Factory premium sound system, potentially with CD changer option and cassette player.

Climate Control:

Automatic dual-zone climate control with recirculation and air filtration.

Driver Assistance

Cruise Control:

Standard electronic cruise control.

Parking Assistance:

Rear parking sensors ('Park Distance Control') were an optional feature.

Connectivity

Telecommunications:

Optional integrated car phone (cellular).

Convenience Features

Memory Seats:

Power adjustable front seats with memory function for driver's seat and mirrors.

Sunroof:

Power glass sunroof with tilt and slide function.

🔧 Maintenance

Service Intervals

Oil Change Interval:

Typically every 7,500 - 10,000 miles or 12 months, depending on driving conditions. Refer to manual for specific conditions.

Transmission Fluid Service:

Recommended every 50,000 - 60,000 miles, though often considered 'lifetime' by older standards. Manual will specify.

Coolant Flush Interval:

Every 2-3 years or 30,000-50,000 miles.

Spark Plug Replacement:

Around 60,000 miles (depending on plug type, likely copper or platinum for this era).

Fluid Specifications

Engine Oil Specification:

BMW High Performance Synthetic SAE 5W-30 or 5W-40 (refer to manual for exact spec, e.g., BMW LL-98 spec development).

Coolant Specification:

BMW Blue Ethylene Glycol based coolant (or equivalent).

Brake Fluid Specification:

DOT 3 or DOT 4.

Known Issues

Head Gasket Leaks:

While the M60 is robust, early signs of coolant leaks or oil in coolant can indicate head gasket issues.

Oil Pan Gasket Leaks:

Common due to age and material degradation, leading to drips.

ABS Module Failure:

The ABS control module can be prone to failure over time, affecting braking performance.

Window Regulator Failure:

Power window mechanisms can fail due to wear on motors and cables.

Evaporator Core Leaks:

Common issue for HVAC systems, causing coolant loss and often requiring dashboard removal for replacement.

Self Leveling Suspension Failure:

The SLS system (on rear) can develop leaks in the accumulators or pump, leading to a sagging rear end.

📚 Vehicle History

Brand Heritage

Bmw Legacy:

BMW has a long-standing reputation for producing driver-focused luxury vehicles with performance engineering.

Model Evolution

E32 Generation:

The E32 generation (1986-1994) marked a significant step forward in BMW's luxury sedan offerings, introducing V8 engines and advanced technology.

740I Introduction:

The 740i and 740iL models, powered by the new M60 V8, were introduced to offer a more powerful and refined alternative to the previous 735i.

Production

Production Period:

The E32 generation was produced from 1986 to 1994. The 740i/740iL variants were introduced in the early 1990s.

🏆 Awards & Recognition

Recognitions

Automotive Journalism Awards:

While specific awards for the 1991 740i are not widely publicized, the E32 generation was generally praised by automotive press for its engineering and luxury.