Repair and Diagnosis: Technical Service Bulletins

• How to Find Technical Service Bulletins by Category/Symptom
• Recalls
  • Generals
    • Campaign - Replace Cruise Control Linkage Bushings
  • Safety
    • Recall - Binding Cruise Control Linkage
      • Overview
      • Owner Letter Information
      • Work Procedure
      • Administrative Procedure
    • Recall - Rear Seat Belt Retractor Installation
      • Overview
      • Customer Letter
      • Administrative Procedure
    • Recall 83V111000: Rear Seat Belt Locking Retractors
    • Recall 85V023000: Speed Control Linkage Corrosion
• Customer Interest
  • Engine - Oil In the Cooling System
  • Rear Drive Belt - Oscillation or Damage
  • Spur Belt - Rubbing on Belt Cover
  • Camshaft Spur Belt - Loosely Adjusted
  • Engine - Poor Performance After A Cold Start
  • Cooling System - Corrosion
  • Radiator Cooling Fans - Noise
  • Engine - High Temperature Gauge Readings
  • Radiator - Plugged Up
  • Front Brakes - Groaning Type Noise
  • Camshaft Drive - Replaced Parts Upon Belt Failure
  • Engine - Low or No Oil Pressure On Cold Start
  • Coolant Pump - Leaks
  • Oil Cooler Housing Blind Plug - Leaks
  • Oil Cooler Housing Blind Plug - Leaking
  • Window Regulators - Prevent Looseness
  • Leather Upholstery - Reconditioning
  • Hydraulic Clutch - Pedal Stays Down/Air In the System
  • Battery - Diagnosing a Discharging Condition
    • Overview
    • 1. General Information
    • 2. Battery Service/General
    • 3. Vehicle Delivery Hints (See Delivery Check Sheet)
    • 4.0 Replacement Battery (Filled or DRY)
    • 5. Discharged Battery
      • Overview
      • 5.1 Preservation Charging
      • 5.2 Discharged and Sulfated Batteries
      • 5.3 Reference Values For Battery Discharge/Parking Time
    • 6. Battery Voltage Checking
      • Overview
      • 6.1 Battery Voltage Correction Values
      • 6.2 Checking Electrolyte Density
      • 6.3 Correction Values For Electrolyte Density
    • 7. Starting Capability (Load Test)
    • 8. Checking Constant Current Draw ( All Vehicle Types)
    • 9. Summary
    • Battery Maintenance Log Sheet
    • Battery Check Sheet
  • Brakes - Pedal Pulsation/Vibration
  • Windshield - Water Leaks
  • Engine - Excessive Vibration From Engine Mounts
  • Hydraulic Engine Mount, Right Hand - Vibration
  • Brakes - Squeaks May Be Normal Performance
• Labor/Parts Updates
  • Front Brakes - Groaning Type Noise
  • Oil Cooler Housing Blind Plug - Leaking
• Seals, Gaskets
  • Engine - Low or No Oil Pressure On Cold Start
• Superceded Bulletins
  • 20/07 - 12/21/07
  • 91/05 - 07/28/05
  • 49004 - 02/15/90
  • 49006 - 06/22/90
  • TOOLS9001 - 06/08/90
  • 48705 - 06/05/87
  • 49006 - 08/07/90
  • 49101 - 01/22/91
  • 49104 - 04/09/91
  • 9201 - 06/25/92
  • 9407 - 02/17/94
  • 19103 - 03/26/91
  • 19011 - 05/08/90
  • 19001 - 02/02/90
  • 18803 - 09/04/88
  • 18708 - 06/03/87
  • Alpine CD-2 Radio - Security Code
  • Power Steering Racks - Diagnosing & Repairing Leaks
  • Brake Caliper - Sliding Lubricant Use During Service
  • Cylinder Head Gaskets - Oversized for Machined Heads
  • Tires/Wheels - Winter Rim Recommendations
  • Engine - Porsche Approved Engine Oils
  • Engine - Engine Oils Approved By Porsche
  • Engine - Overview Of Approved Engine Oils
  • Engine - Approved Engine Oil Specifications
• All Technical Service Bulletins
  • Drivetrain - Drive Shaft Grease Incorrectly Labeled
  • Vehicle - Use Only Approved Parts For Collision Repairs
  • 18801 - 02/12/88
  • Tools - Quick Scope Plus
  • Tools - Auto Scopemeter & Engine Analyzer
  • Technical Information (Advanced) - 23rd Supplement
    • Overview
    • 928 M.Y. 1985/86 Flywheel/Ignition Timing-Performance Problems
    • 924S, 944, 944S M.Y. 1988 Crankcase Ventilation Heater
    • 928 S4 M.Y. 1988 Engine Oil Level Checking System -- Modified
    • 944 Engine Performance - to Determine Cause of Problem
    • 928/928 S4 Ignition Trigger Control Heat Conducting Paste
    • 911 Turbo M.Y. 1986 Ignition Delay Relay - Modified
    • 911 Turbo M.Y. 1986 Acceleration/Enrichment Relay - Modified
    • 924 Turbo M.Y. '81/'82 Ignition Control Unit - Pressure Line
    • 911 Carreara M.Y. 1987 DME Control Unit Modified
    • 911 Turbo M.Y. 1987 Acceleration - Enrichment Relay - Modified
    • 944S, 944T M.Y. 1988 DME Control Unit: Modified
    • 944S, 944T Knock Sensor - Modified
    • 928 S4 M.Y. '87 - '89 Battery - Modified
    • 928 S4 M.Y. '89 TDC Sending Unit - Deleted
    • 911C2/4 *Reduced Engine Broking Effect
    • 911 Carrera M.Y. 1984 Trans Mainshaft Bearing Loose
    • 944 Transmission/Drive Train Noise
    • Carrera 2/4 *Additional Shifter Boot Installed
    • 911 Carrera M.Y. 1987 Rear Stabilize BAR - Modified
    • 944, 944S 944T M.Y. 1988 With M-593 ABS - Modified
    • 911 Carrera 911 Turbo M.Y. '88 Hand Brake Shoes - Modified
    • 944, 944S, 944 S2, 944T, 928, 928S 928 S4, 928 GT P.S. Belt Tension
    • 911 Carrera Door Lock/Tumbler Set - Replacements
    • 928S Front Hood - Height Adjustment
    • 944 Front Fender - Modified
    • 944, 944T M.Y. '89 Rear Lid Modified
    • 911 C 2/4 *Door Contact Switch Modified
    • 911 Carrera M.Y. 1985 Electric Window Winder Relay - Relocated
    • 911 Carrera M.Y. 1985 Mirror Switch and Window Heater
    • 911 Cabrio M.Y. '86 - '89 Convertible Locking Motors - Modified
    • 911 C2/4 *Tonneau Cover Strap Fasteners Installed
    • 944, 944 Turbo M.Y. '86 Seat Back Unlocking Knob - Installation Procedure
    • 944, 944T M.Y. '89 A/C High and Low Pressure Switch Modified
    • 924 Turbo M.Y. 1981 Tachometer - Supersession
    • 911 Carrera 911 Turbo M.Y. 1988 Luggage Compartment Wiring Harness
    • 928 S4 Securing of Battery Ground Cable - Modified
    • 928 S4 911/T M.Y. '88 Alarm System - Modified
    • 928 S4 All 4 CYL. M.Y. 1988 Windshield Wiper Relay - Modified
    • 928S/928 S4 M.Y. '86, '87, '88 Modified Rear Lid Motor
    • 911 Carrera 911 Turbo 928 S4 Spare Paint Deleted
  • Warranty - Engine Follow Up Service After Major Repairs
  • Electrical Harnesses - Routing and Securing
  • Campaign - Replace Cruise Control Linkage Bushings
  • Recall - Binding Cruise Control Linkage
    • Overview
    • Owner Letter Information
    • Work Procedure
    • Administrative Procedure
  • VIN, Certification, & Emission Label - Availability
  • Tools - Minimum Requirement Listing
  • Warranty - Access Start Dates and Recall Inquiry
  • Technical Information Books - Available Stock Listing
  • Techincal Information Booklets - Current Availability
  • Towing - Long Distance & Emergency
  • Microfiche - New Issues and Table of Contents
  • Workshop Manuals - Ordering Information
  • Warranty - Improper Modifications to Electrical System
  • Tools - New and Required for Vehicle Service
  • Seat Belt Warning Lamp - ON When Turn Signals Switched
  • Tools - Testers for Alarms, Central Warning, & Air Bag
  • A/C - Revised Sealing Rings for Expansion Valves
  • A/C Refrigerant - General Recovery & Recycling Tips
  • A/C - Substitutes for R-12 Refrigerant
  • A/C Refrigerant - Identifier
  • A/C - Retrofitting R12 Systems to R134
    • Overview
    • Procedures
  • A/C - Refrigerant 134a Use
  • Power Steering - New Procedures Working on Pumps/Racks
  • Camshaft Drive Belts - Recommended Usage
  • Balance Shaft Belt - Align Paint Mark When Installing
  • Connecting Rod Nuts - Incorrectly Made
  • Connecting Rods, Nuts - Revised
  • Engine - Drive Belt Checking and Adjusting Values
  • Oil Pressure Relief Valve - Revised
  • Engine - Lighter Version Connecting Rods
  • Engine - Oil In the Cooling System
  • Oil Pressure Relief Valve - Modified
  • Oil Pressure Relief Valve - Identification & Application
  • Rear Drive Belt - Oscillation or Damage
  • Tools - Oil Cooler Testing
  • Oil Pan - Sealing
  • Engine Short Block - Installation Modifications
  • Spur Belt - Rubbing on Belt Cover
  • Balance Shafts Spur Belt - Maintain Runing Direction
  • Cylinder Heads - Tightening Procedure & Service Changes
    • Overview
    • 924 Model
    • 924 Turbo Model
    • 924S, 944, 944S, 944 Turbo Model
    • 911 Carrera Model
    • 928, 928S, 928 S4 Model
  • Camshaft Spur Belt - Loosely Adjusted
  • Timing Belt Cover - Ventilation System Change
  • Toothed Engine Belts - Storage, Packing and Handling
  • Valve Seal - Replacement Procedure
    • Overview
    • Work Procedure:
    • Installing New Seals
  • Tools - Calibration Gauge for Special Tool 9201
  • Tools - Rebuilt and Exchange Program for Tools
  • VIN Plate, Certification & Emission Label - Availability
  • VIN, Certification & Emission Labels - Availability
  • Engine - Poor Performance After A Cold Start
  • Cooling System - Corrosion
  • Cooling System - Clean & Flush After Repairing Leak
  • Coolant Pump - Installing New Type
  • Radiator Cooling Fans - Noise
  • Engine - High Temperature Gauge Readings
  • Radiator - Plugged Up
  • Radiator Thermoswitch - Revised Torque Specification
  • Radiator Coolant Thermo Switch - Torque Specification
  • Cooling System - Approved Phosphate Free Anti-Freeze
  • Electrical System - Poor Pin/Ground Lug Connections
  • Power Steering Pump - Flush Hoses After Replacing
  • Brake Pad - Installation Hardware Ordered Separately
  • Brake Pads - Available Without Asbestos
    • Overview
    • 4 Cylinder Cars (Water-Cooled)
    • Air Cooled Cars (911, 911 Turbo, 912 and 914)
    • 8 Cylinder Cars
  • Spark Plugs - Install With Threads Clean and Dry
  • Spark Plugs - Revised Plugs and Tightening Torque
  • Tools - Compressor Seal Replacement
  • Front Brakes - Groaning Type Noise
  • Power Steering Gear - Diagnosis
  • Engine - Modified Components
  • Camshaft Drive Belt (Turbo) - Revised Part & Adjustment
  • Camshaft Spur Belt - Proper Tension Adjustment
  • Cam Belt Tensioner Nut - Torque Specification
  • Camshaft Drive - Replaced Parts Upon Belt Failure
  • Cylinder Heads - Machining and Using Correct Gaskets
  • Engine - Low or No Oil Pressure On Cold Start
  • Oil Cooler/Oil Pressure Relief Valve - Repair Guide
    • Overview
    • Section 1 - Oil Pressure Relief Valve
    • Section 2 - Oil Cooler Repairs
  • Coolant Pump - Leaks
  • Cooling Fan Motor - Correct Positioning
  • Oil Cooler Housing Blind Plug - Leaks
  • Oil Cooler Housing Blind Plug - Leaking
  • Oil Cooler Housing - Leaking
  • Wheels - Unapproved Installation of 18 Inch Wheels
  • Summer Tires - Wheel Rim Summary
  • Tires/Wheels - Summer Recommendations
    • Overview
    • Tire Pressures 924S/944/Turbo/S/S2
    • Wheel Rim For Summer Tires, 944TURBO/S/S2
    • Tire Pressure, Tire and Wheels Model 968
    • Tire Pressure, Tire and Wheels, 911
    • Summer Tire Dimensions and Makes, 911
    • Tire Pressure, Tire and Wheels 928/S/S4/GT
  • Tires/Wheels - Summer Tire and Wheel Rim Summary
  • Tools - Special Wheel Balancing Adapter
  • Wheels - Non Approval of Chrome Plating Aluminum Wheels
  • Wheels - Retrofitting Unapproved 18 Inch Wheels
  • Tire/Wheel Rim - Latest Winter Recommendations
    • Overview
    • Tire Pressures
    • Collapsible Spare Tire Information
    • Recommended Winter Tires For Porsche 4 CYL. ENG. Cars
    • Winter Wheel Rim and Tire Sizes For Porsche 4 CYL. ENG. Cars
    • Survey of 4 CYL. Porsche Wheel Rims For Winter Tires
    • Recommended Winter Tires For Porsche 6 CYL. ENG. Cars
    • Winter Tire/Wheel Rim Summary and Tire Sizes For 6 CYL. ENG. Cars
    • Survey of 6 CYL. ENG. Porsche Wheel Rims For Winter Tires
    • Recommended Winter Tires For Porsche 8 Cylinder Engine Cars
    • Winter Wheel Rim and Tire Sizes For Porsche 8 Cylinder Engine Cars
    • Survey of Porsche Wheel Rims For Winter Tires - 928/S/S4/GT
  • Wheel/Tire - General Information
    • Overview
    • Mounting, Balancing & New Wheel/Tire Information
    • Tire Pressure & Tire Storage Information
  • Tires/Wheels - Winter Tire/Wheel Rim Summary
    • Overview
    • Recommended Winter Tires and Matching Wheel Rims
  • Tires - Manufacturer Contact Information
  • Tires (VR-Rated Summer ) - Do Not Mix With ZR Rated
  • Tires - Winter Tire Summary Supplement
  • Gas Cap Lock - Modifying
  • Window Regulators - Prevent Looseness
  • Leather Upholstery - Reconditioning
  • Electric Sun Roof - Troubleshooting and Repair
    • Overview
    • General Information
    • Section 2-3
    • Section 4
    • Section 5
    • Section 6-11
    • Section 12-13
    • Section 14
    • Section 15-16
    • Section 17
    • Section 18
    • Section 19
    • Section 20
    • Section 21-22
  • Lifting Roof - Modification
  • M/T (5-Speed) - Revised Ring Gear and Pinion
  • Final Drive Cover Seal Groove - Deleted
  • Hydraulic Clutch - Pedal Stays Down/Air In the System
  • Fuel Injectors - Correct Part Identification
  • Brake Calipers - Modified Piston and Dust Seals
  • Brakes - Lubricate During Repair for Brake Pulling
  • Battery - Diagnosing a Discharging Condition
    • Overview
    • 1. General Information
    • 2. Battery Service/General
    • 3. Vehicle Delivery Hints (See Delivery Check Sheet)
    • 4.0 Replacement Battery (Filled or DRY)
    • 5. Discharged Battery
      • Overview
      • 5.1 Preservation Charging
      • 5.2 Discharged and Sulfated Batteries
      • 5.3 Reference Values For Battery Discharge/Parking Time
    • 6. Battery Voltage Checking
      • Overview
      • 6.1 Battery Voltage Correction Values
      • 6.2 Checking Electrolyte Density
      • 6.3 Correction Values For Electrolyte Density
    • 7. Starting Capability (Load Test)
    • 8. Checking Constant Current Draw ( All Vehicle Types)
    • 9. Summary
    • Battery Maintenance Log Sheet
    • Battery Check Sheet
  • Catalytic Converter - Revised Part Available
  • Exhaust System - Sulfur Like Smell
  • Recall - Rear Seat Belt Retractor Installation
    • Overview
    • Customer Letter
    • Administrative Procedure
  • Brakes - Pedal Pulsation/Vibration
  • Engine Main Bearing - Revised Torque
  • Engine - Additional TDC Mark on Flywheel
  • Fuel/Ignition Modules - Use of Aftermarket Microchips
  • Engine - Tune Up Specifications
  • Wiper Motor Hole (In the Rear Hatch Glass) - Changed
  • Windshield Wiper Interval Relay - Improved
  • Stabilizer Bar - Modification
  • Paint - Manual Supplements
  • Tools - Celette Collision Repair Systems
  • Windshield Antenna - Correct Installation
  • Vehicle Security Codes - Requesting
  • Rear Lid Latch Assembly - Water Entry
  • CO Sample Pipe - Material and Mounting Change
  • Control Unit - Parts, Coding/Adapter Plug, O2 Sensor
  • Blaupunkt Radio Speakers - Improved
  • Wiper Blades - Correct Application
  • Windshield Cement - Mixing
  • Windshield - Water Leaks
  • Engine Lubrication - Oils That Minimize Carbon Build-Up
  • Engine - Motor Oils That Minimize Carbon Build-Up
  • Engine - Approved Engine Oils
  • Engine - Porsche Approved Oils
  • A/T - Engine Vacuum Testing
  • A/T - How To Use A Pressure Gauge
  • A/T - Slipping or No-Shift/Metal Sealing Rings
  • A/T - Front Bushing Wear
  • A/T - Math Formulas Part I
    • Overview
    • Shift Speed and Pressure
    • Speedometer Ratios
  • A/T - Twenty Steps To Successful Repairs
  • A/T - Math Part II
  • A/T - Choosing the Right ATF
  • Engine - Excessive Vibration From Engine Mounts
  • Hydraulic Engine Mount, Right Hand - Vibration
  • Engine Mount - Revised, Installation and Checking
  • Transmission Fluids - Specifications
  • Vehicle - Year 2000 Hardware/Software Readiness
  • Recall 83V111000: Rear Seat Belt Locking Retractors
  • Recall 85V023000: Speed Control Linkage Corrosion
  • Tools - Wheel Alignment Equipment
  • CV Joint - New Grease
  • Brake Fluid - DOT 4 Now Used In Production
  • Hand Brake Shoe Retaining System - Correct Installation
  • A/C - Use of Correct Refrigerant
  • Brakes - Squeaks May Be Normal Performance
  • A/C - Refrigerent Oil Volume Capacities
  • Engine - Approved Engine Oils Overview
  • Tires - Summer Tire Summary
  • Engine - Approved Porsche A40 Engine Oils
  • Tires/Wheels - Handling Instructions After Damaged