1988–1992 BMW 7 Series 735i, 735iL, 740i, 740iL, 750iL Service Manual (P/N ISBN-10 0-8376-0328-5 / ISBN-13 978-0-8376-0328-5)

• Covers the E32 735i/735iL for 1988–1992 with the 3.5L M30 straight-six, the 740i/740iL for 1993–1994 with the 4.0L M60 V8, and the 750iL for 1988–1994 with the 5.0L M70 V12.
• Bentley Publishers service manual, Stock No. B794, ISBN-10 0-8376-0328-5 / ISBN-13 978-0-8376-0328-5. The supplied 982-page PDF retains the original chapter layout, tables, illustrations, and electrical wiring-diagram section.
• Identifies the matching transmissions: ZF 4 HP 22 EH for M30 cars, ZF A5S 560Z for M60 cars, ZF 4 HP 24 for M70 cars, plus the Getrag 260/6 manual transmission used with the M30.
• Separates the major electronic systems by model year, including DME 1.3, DME 3.3, DME 1.2, and DME 1.7, along with EML/ADS throttle control, ABS, ASC/ASC+T, LAD self-leveling suspension, EDC III, IHKA climate control, SRS, and ZKE central body electronics.
• Provides model-specific specifications, tightening torques, wear limits, fluid data, diagnostic values, and component-location information rather than generic E32 service notes.

Maintenance and Diagnostic Layout

Routine service is tied directly to the BMW Service Indicator system, with Oil Service, Inspection I and Inspection II schedules and the Service Indicator reset procedure. Maintenance coverage includes engine oil and filters, valve clearance on the M30, drive belts, spark plugs, fuel and air filters, cooling-system service, brakes, steering, suspension inspections, and fluid specifications. The lubricant table distinguishes between applications instead of treating all E32s alike: engine oil with filter is 5.75 L for the 735i/L and 7.50 L for both the 740i/L and 750iL. Coolant capacity is 12.5 L for the 735i/L and 740i/L; the 750iL is listed at 15 L through 9/90 and 13 L from 9/90.

Engine diagnostics go well beyond basic tune-up material. The manual assigns DME 1.3 to 1988–1992 735i/L models, DME 3.3 to 1993–1994 740i/L models, DME 1.2 to 1988–1990 750iL cars, and DME 1.7 to 1991–1994 750iL cars. Coverage includes On-Board Diagnostics, Check Engine fault-code tables, compression testing, driveability troubleshooting, air-flow and vacuum-leak checks, fuel-supply tests, battery-voltage and ground checks, and DME input/output diagnosis. That model-year split matters when tracing an E32 that has the correct engine but a different management generation.

Because this manual covers engine removal, transmission work, brake hydraulics, SRS components, high-voltage ignition, and A/C service, the safety warnings and correct lifting, electrical-isolation, and refrigerant-handling practices should be followed before repair work begins.

Engine Specifications and Repair Procedures

The engine data table identifies the M30 at 182 hp, the M60 at 282 hp, and the M70 at 296 hp, with displacement, compression ratio, and torque figures listed alongside each application. Spark plug data is also engine-specific: the M30 and M70 use a 0.7–0.8 mm electrode gap, while the M60 application is listed as non-adjustable. The general DIN 267 fastener table gives 24 Nm for an M8 class 8.8 bolt and 47 Nm for an M10 class 8.8 bolt, while component-specific torque values take precedence throughout the repair chapters.

Major shop-level procedures include M30/M60/M70 engine removal and installation, cylinder-head removal and refitting, M30 valvetrain service, M60 and M70 camshaft timing-chain setup, lubrication-system work, ignition and fuel-injection diagnosis, cooling-system repair, and exhaust service. The timing chapters reference BMW special tools such as 11 2 300 for locking the crankshaft at TDC and 11 3 190 for locking the M70 camshafts; M30 camshaft work calls out tool 11 1 060.

The cautions are unusually useful when evaluating repair depth. During M30 camshaft removal, Bentley specifies tightening special tool 11 1 060 on the exhaust side first; the wrong clamping order can damage the valves. On the M60, the cylinder-head section warns that incorrectly installed knock-sensor harness connectors can result in serious engine damage.

Transmission, Chassis, and Electrical Coverage

Transmission coverage is specific about both capability and limits. The automatic-transmission chapter covers troubleshooting, stall-speed and ATF main-pressure tests, ATF service, unit removal/installation, and external seal replacement for the 4 HP 22 EH, 4 HP 24, and A5S 560Z. The Getrag 260/6 chapter covers external service, oil seals, and transmission removal/installation. Internal transmission teardown and overhaul are not covered, which is an important distinction if you are buying the manual specifically for a gearbox rebuild.

Chassis coverage includes front and rear suspension, final drive, steering and wheel alignment, brakes, and integrated suspension systems. LAD procedures cover filling and bleeding, ride-height adjustment, regulator-valve and accumulator service, plus troubleshooting. EDC III coverage adds damper-solenoid settings, acceleration and steering-angle sensors, control-module pinouts, and fault diagnosis. The brake section includes hydraulic-booster testing, with 52–57 bar upper switching pressure, 36–41 bar lower switching pressure, and a maximum 5 bar pressure drop after five minutes.

The electrical section is equally model-year specific. Named schematics include Ground Distribution, Engine Management, Engine Cooling, Air Conditioning & Heating, Anti-Theft, and Exterior Lights, with many sheets split by year and model rather than presented as a single generic circuit. Separate chapters cover component locations, instruments, exterior lighting, wipers, switches, central locking, seats, sunroof, IHKA, radio, and the SRS airbag system. For electrical repair and restoration work, that combination of wiring diagrams, pinouts, relay/fuse locations, and system-specific diagnostics is one of the strongest reasons to use this Bentley manual instead of a basic maintenance guide.