Porsche 911 1985 Factory Service Repair Manual

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🏷️ Basic Information Identification Make: Porsche Model: 911 Year: 1985 Codes Chassis Code: 911 G-Series Vin Decoder Start Year: 1967 Vin Decoder Start Digit: 911... 👋 Introduction Market Position Positioning:...

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Sku: 370177

Tags: 1985 911 Car Cars Porsche

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Description

🏷️ Basic Information

Identification

Make:

Porsche

Model:

Year:

Codes

Chassis Code:

911 G-Series

Vin Decoder Start Year:

Vin Decoder Start Digit:

911...

👋 Introduction

Market Position

Positioning:

Iconic sports car, representing a peak of air-cooled Porsche engineering

Competitive Analysis

Competitors:

Ferrari 308/328, Lotus Esprit, Chevrolet Corvette C4

Key Features

Engine Layout:

Rear-engine, air-cooled flat-six

Driving Dynamics:

Renowned handling, steering feel, and acceleration

Design Philosophy:

Evolutionary design with a focus on performance and driver engagement

📋 Manual Details

Coverage Areas

Scope:

Comprehensive repair and maintenance for Porsche 911 (1985 model year)

Page Count

Estimated Pages:

Manual Type

Type:

Factory Service Repair Manual

Language

Language:

English

Format

Format:

Printed Book

📖 Manual Coverage

Systems Covered

Engine:

3.2L Flat-6 (930/20, 930/21, 930/25 variants), including DME, ignition, fuel injection, cooling, lubrication, exhaust

Transmission:

915 5-speed manual transaxle, G50 5-speed manual transaxle (later 1985 models), clutch system, differential

Drivetrain:

Rear-wheel drive, axles, CV joints

Suspension:

Front and rear MacPherson struts, torsion bars, trailing arms, anti-roll bars, bushings

Steering:

Rack and pinion, steering column, power steering system

Brakes:

Front and rear disc brakes (solid/ventilated), brake calipers, master cylinder, ABS (optional on some models), parking brake

Electrical:

12V system, battery, alternator, starter, fuse box, wiring diagrams, lighting, instrumentation, power windows, wipers

Body And Chassis:

Body panels, doors, hood, trunk, bumpers, interior trim, seating, sunroof

Heating And Air Conditioning:

HVAC system, climate control, ventilation, A/C components

Procedures Included

Maintenance:

Oil change, filter replacement, spark plug service, tune-ups, fluid checks, belt inspection/replacement

Repair:

Engine rebuild, transmission overhaul, brake caliper rebuild, suspension component replacement, electrical diagnostics and repair

Disassembly Assembly:

Detailed step-by-step instructions for removing and reinstalling all major components and sub-assemblies

Troubleshooting:

Diagnostic procedures for common and uncommon issues, fault codes, symptoms

Adjustments:

Valve lash adjustment, ignition timing, fuel mixture settings, brake adjustment

Checks:

Compression testing, leak-down testing, fluid level checks, electrical system testing

Technical Depth

Depth:

Full factory-level diagnostic and repair information, suitable for professional mechanics and experienced DIY enthusiasts

📊 Manual Specifications

File Format

Digital Format:

Not applicable (Printed Book)

Print Quality

Quality:

High-quality paper stock, clear text, and diagrams

Binding Type

Binding:

Durable binding (e.g., perfect bound, saddle-stitched) for workshop use

Paper Type

Paper:

Durable, grease-resistant paper ideal for workshop environments

⚙️ Engine Specifications

Primary Engine

Engine Type:

Naturally Aspirated Flat-6 (Boxer)

Displacement:

3164 cc (3.2 Liters)

Bore X Stroke:

95 mm x 74.4 mm

Compression Ratio:

10.3:1

Engine Codes European:

930/20 (Carrera), 930/21 (Carrera Targa), 930/25 (Carrera Cabriolet)

Performance

Horsepower:

207 hp @ 5900 rpm (approx.)

Torque:

195 lb-ft @ 4800 rpm (approx.)

Redline:

6500 rpm

Fuel System

Fuel Injection:

Bosch Motronic DME (Digital Engine Electronics)

Fuel Type:

Unleaded Gasoline, Premium (91 octane or higher recommended)

Fuel Pump:

Dual electric fuel pumps

Cooling System

Cooling Type:

Air-cooled with oil cooling

Oil Cooler:

Front-mounted oil cooler

🔧 Transmission

Standard

Transmission Type:

915 5-Speed Manual Transaxle

Optional

Transmission Type Later 1985:

G50 5-Speed Manual Transaxle (introduced mid-model year)

Features

Drive Layout:

Rear-engine, rear-wheel drive

Clutch Type:

Hydraulic actuation (dry single-plate)

Differential:

Limited Slip Differential (LSD) often optional or standard on certain variants

📐 Dimensions

Exterior

Length:

Approx. 4271 mm (168.1 in)

Width:

Approx. 1676 mm (66.0 in)

Height:

Approx. 1310 mm (51.6 in)

Wheelbase:

Approx. 2273 mm (89.5 in)

Weights

Curb Weight:

Approx. 1120-1200 kg (2469-2646 lbs) depending on body style and options

Gross Vehicle Weight Rating:

Approx. 1650 kg (3638 lbs)

🛡️ Safety Features

Ratings

Crash Test Information:

No comprehensive NHTSA/IIHS ratings available for this era, but known for robust chassis construction.

Active Features

Anti-lock Braking System (ABS) optional on some models

Braking System:

Powerful four-wheel disc brakes

Passive Features

Seatbelts:

Three-point inertia-reel seatbelts

Body Construction:

Integrated safety cage, crumple zones

Steering Column:

Energy-absorbing steering column

💡 Technology Features

Infotainment

Radio System:

Period-appropriate Blaupunkt or Becker cassette/radio systems were common; aftermarket upgrades are frequent.

Speakers:

Basic speaker configurations, often in doors and rear parcel shelf.

Driver Assistance

Cruise Control:

Optional on most models.

Connectivity

Connectivity Features:

Limited by era; primarily focused on the driving experience rather than electronic connectivity.

🔧 Maintenance

Service Intervals

Oil Change Interval:

Every 7,500 miles or annually, whichever comes first. Check manual for specific intervals and conditions.

Filter Replacement Interval:

Oil filter with every oil change. Air filter and fuel filter typically every 15,000-30,000 miles or as specified.

Spark Plug Replacement:

Refer to manual; typically every 30,000 miles for copper plugs.

Brake Fluid Flush:

Every 2 years, regardless of mileage.

Fluid Specifications

Engine Oil Type:

SAE 20W-50 or 10W-40 (specific to climate and engine condition, refer to manual). Synthetic oils are highly recommended for air-cooled engines.

Engine Oil Capacity:

Approx. 9.5 liters (10 US quarts) including oil cooler

Transmission Fluid Type 915:

API GL-4 SAE 75W-90 or 80W-90 gear oil (manual specifies specific types).

Transmission Fluid Type G50:

API GL-4 SAE 75W-90 gear oil (manual specifies specific types).

Brake Fluid Type:

DOT 4

Coolant Type:

Not applicable (Air-cooled engine)

Known Issues

Oil Leaks:

Common due to aged seals and gaskets (e.g., engine-to-gearbox, valve covers, oil cooler seals).

Valve Stem Seals:

Can degrade over time, leading to oil consumption and blue smoke on startup.

Heater Boxes:

Can seize or malfunction, affecting cabin heating performance.

Fuel Line Hoses:

Original rubber fuel lines can become brittle; replacement with modern, high-quality lines is recommended.

915 Transmission Grinding:

The 915 gearbox can be prone to grinding into 2nd or 3rd gear if not shifted carefully or if synchros are worn.

Rear Main Seal:

Leaking rear main seal is a significant repair often requiring engine removal.

📚 Vehicle History

Brand Heritage

Heritage:

Porsche has a long and storied history in motorsport and performance car manufacturing, dating back to the 1930s.

Model Evolution

Predecessor:

Porsche 911 (pre-1985 G-Series updates)

Updates For 1985:

Introduction of the G50 transmission on later 1985 models, updated fuel injection (DME), improved aerodynamics, potential for ABS.

G-Series Era:

The G-Series 911 (1974-1989) represented a significant evolution, adapting the original 911 concept to meet new safety and emissions standards while retaining its core character.

Production

Production Period:

1985 model year

Manufacturing Location:

Stuttgart, Germany

🏆 Awards & Recognition

Recognitions

Automotive Icon:

Consistently ranked among the greatest sports cars of all time by automotive publications.

Classic Status:

Widely considered a desirable modern classic and highly sought after by collectors.

Ratings

Value Retention:

Excellent value retention and appreciation potential due to its iconic status and build quality.