Repair and Diagnosis: Technical Service Bulletins

• How to Find Technical Service Bulletins by Category/Symptom
• Recalls
  • Campaign - Fuel Cooler Replacement
    • Overview
    • Technical Instructions
    • Administrative Procedure
    • Owner Letter
• Customer Interest
  • Power Steering - Hydraulic Noise During Full Turns
  • Cooling System - Corrosion
  • Radiator - Plugged Up
  • Coolant Pump - Leaks
  • Leather Upholstery - Reconditioning
  • Power Seats - Insufficient Headroom
  • Clutch - Incomplete Disengagement
  • 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
  • Voltage Regulator - Preventing Failure
  • Brakes - Pedal Pulsation/Vibration
  • Clutch - Binding of Clutch Discs
  • Door Speaker Mounting - Broken
  • A/T - Hard Shifting
  • Seat Rail - Adjusting For More Leg Room
  • Brakes - Squeaks May Be Normal Performance
• Superceded Bulletins
  • 20/07 - 12/21/07
  • 91/05 - 07/28/05
  • 49004 - 02/15/90
  • 49006 - 06/22/90
  • 98806 - 12/30/88
  • 48705 - 06/05/87
  • 49006 - 08/07/90
  • 49101 - 01/22/91
  • 49104 - 04/09/91
  • 9201 - 06/25/92
  • 9407 - 02/17/94
  • Alpine CD-2 Radio - Security Code
  • Power Steering Racks - Diagnosing & Repairing Leaks
  • Brake Caliper - Sliding Lubricant Use During Service
  • Tires - Winter Tire Summary Supplement
  • 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
  • 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
  • Battery - Checking Constant Current Draw
  • Campaign - Replace Fuel Cooler
    • Overview
    • Jq Work Procedure
    • Owner Letter Information
  • 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 & Table of Contents for Binder - New
  • Microfiche - New Issues and Table of Contents
  • Workshop Manuals - Ordering Information
  • Warranty - Improper Modifications to Electrical System
  • Tools - New and Required for Vehicle Service
  • Fuse - Location for Rear Lid Lock Motor
  • 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 - Hydraulic Noise During Full Turns
  • Steering Stop and Dust Cover - Modified
  • Power Steering - New Procedures Working on Pumps/Racks
  • Four Speed A/T - Overhaul
  • A/T - When Installing Short Unit Adjust Pinion
  • Camshaft Housing Gaskets - Modified
  • Oil Pan and Suction Pipe - Recommended Replacement
  • 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
  • Toothed Engine Belts - Storage, Packing and Handling
  • Tools - Calibration Gauge for Special Tool 9201
  • VIN Plate, Certification & Emission Label - Availability
  • VIN, Certification & Emission Labels - Availability
  • Cooling System - Corrosion
  • Cooling System - Clean & Flush After Repairing Leak
  • Tensioning Roller Carrier, Water Pump - Modification
  • Thermostat Housing - Revised
  • Radiator - Plugged Up
  • 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
  • A/C Evaporator - Replacement Procedure
  • Power Steering Gear - Diagnosis
  • Camshaft Drive Belt - Adjustments
  • Cylinder Heads - Machining and Using Correct Gaskets
  • Cylinder Head Bolts - Revised Torque & Sequence
  • Coolant Pump - Leaks
  • Lower Ball Joint - Modified Support and Mounting
  • Wheels - Unapproved Installation of 18 Inch Wheels
  • 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 - Aftermarket Wheel Rims With Pressure Switches
  • 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
  • Leather Upholstery - Reconditioning
  • Power Seats - Insufficient Headroom
  • Clutch Discs I On II - Friction Material Changed
  • Ring Gear and Pinion Sets - Revised
  • A/T - New Oil Pan, ATF Reservoir, and Filler Pipe
  • A/T - Change Torque Converter When Replacing
  • Clutch - Incomplete Disengagement
  • Fuel Injectors - Correct Part Identification
  • Brake Calipers - Modified Piston and Dust Seals
  • 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
  • Alternator Belt & Pulleys - Revised
  • Voltage Regulator - Preventing Failure
  • TDC Sensor - Do Not Use to Set Timing
  • Exhaust System - Sulfur Like Smell
  • Telephone - Installation and Operation
    • Overview
    • Wiring Installation 911 Carrera 2 and 911 Carrera 4
    • Wiring Installation, 944 Models From 85/2 (Coupe Only)
    • Wiring Installation, 928 S4 and 928 GT
  • Brakes - Pedal Pulsation/Vibration
  • Clutch - Binding of Clutch Discs
  • Crankshaft Main Bearings - Modifications
  • Crankshaft Main Bearings - Modified
  • Fuel/Ignition Modules - Use of Aftermarket Microchips
  • Engine - Tune Up Specifications
  • Aluminum Body Parts - Use of Plastic Filling Compounds
  • Paint - Manual Supplements
  • Tools - Celette Collision Repair Systems
  • Windshield Antenna - Installation
  • Windshield Antenna - Correct Installation
  • Vehicle Security Codes - Requesting
  • Rear Lock Lid Motor - Improved Motor
  • Emissions - Basic Equipment and Tune-Up Specifications.
  • Control Unit - Parts, Coding/Adapter Plug, O2 Sensor
  • Door Speaker Mounting - Broken
  • Windshield Cement - Mixing
  • 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 - Hard Shifting
  • Central Tube - Installation
  • A/T - Engine Vacuum Testing
  • A/T - How To Use A Pressure Gauge
  • A/T - Harsh Shifts or Erratic Shift Quality
  • A/T - Slipping or Soft Shifts
  • 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
  • M/T - Reverse Gear Lockout Plate Revised
  • A/T - Approved ATF
  • Transmission Fluids - Specifications
  • Campaign - Fuel Cooler Replacement
    • Overview
    • Technical Instructions
    • Administrative Procedure
    • Owner Letter
  • Vehicle - Year 2000 Hardware/Software Readiness
  • Tools - Wheel Alignment Equipment
  • Wheels/Tires - Approved Summer Wheels/Tires
  • Tires/Wheels - Winter Tires/Wheels/Snow Chains
  • CV Joint - New Grease
  • Brake Fluid - DOT 4 Now Used In Production
  • Hand Brake Shoe Retaining System - Correct Installation
  • Seat Rail - Adjusting For More Leg Room
  • 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