Technical Service Bulletin Shift Rod Chatter at Idle, Coast or 2500-3000 RPM

Subject: Shift Rod Clatter at Idle, Coast or 2500-3500 RPM Models: 911 Carrera 1986

Bulletin Number: 87 – 04

To reduce shift rod clatter noise at idle, while coasting or at 2500-3500 RPM, the shift linkage received a rubber ring ( 1 in picture), insulating hose (4 in picture).

From Production Date: August 28, 1986

VIN:       910HS120200




To convert 1987 model cars prior to the above vehicle identification numbers, the following parts are required:

1) 999.701.969.40.01 Rubber Ring

2) 999.615.047.40.1 Insulating hose

3) 99.513.002.40.1 Wire strap

4) 950.424.227.00.1 Rubber washer

5) 900. Rivets

     950.424.224.03.1. Bushing

Vehicle part

                                (arrow in picture 2)

Alternative for rivets:

900.               Bolts M8x32

N 011.525.13.2                   Washer

999.               Nuts

1 –           rubber ring

2-            insulating hose 700mm

3-            wire strap/insulating hose

4-            rubber washer

5-            rivet or bolt connection

                M 8 (torque: 23 Nm)

6-            round casting

                mould bumps

A – shift

B – mount

C – shift base

D – distance adjusted: 5mm

Additionally, the shift rod bushing (arrow in picture 2) inside diameter was reduced to 17.99mm (was 18.2mm)

From Production Date: February 4, 1987

VIN: 91 HS 12 1787

         91 HS 12 5061

         91 HS 16 1318

          91 HS 17 1733

New Part Number: 90.424.224.03

This bushing can also be service installed. On cars built after August 28, 1986 but before February 4, 1987, it may only be necessary to replace this bushing.

If only replacing bushing, omit work sequence step 11 through 17.

Detail Section View:

5mm Adjusted Distance.

4th gear engaged.

Work Sequence:

  1. Lift car on hoist
  2. Lift shift diagram cap off shift lever knob carefully using knife, screwdriver or similar tool.
  3. Unscrew shift lever knob allen screw (don’t turn the knob, pull it off).
  4. Dismantle the center console, guide over shift lever and lay aside (electrical equipment remains connected).
  5. Unscrew tunnel cover in front of rear seat.
  6. Disconnect the shift rod on rear mount (B in picture 1).
  7. Unscrew and remove mount with rubber washer.
  8. Unscrew front shift rod bolt. Remove shift base (C in picture 1) with shift lever (A in picture 1).
  9. Clean the shift rod in shift base area.
  10. Replace shift rod bushing (arrow in picture 2).
  11. Slide insulating hose (2 in picture 1 ) as far as possible on the shift rod from the front.
  12. Secure the insulating hose with wire strap (3 in picture 1).
  13. Drill out rivets on rubber washer using 8mm drill bit.
  14. Mount new rubber washer on rear mount (4 in picture 1) with rivets (5 in picture 1).

Alternative: M8 bolts instead of rivets. Torque 23 Nm (17 ft. lbs.)

  1. File down round casting mold bumps left and right on shift base (6 in picture 1).
  2. Clean the shift base and shift lever in area of the rubber ring
  3. Install rubber ring. (1 in picture 1).
  4. Reinstall parts in the following order: Mount shift rod in shift base. Torque bolts to 23 Nm (17 ft. lbs.). Install shift base, do not torque bolts at this time.
  5. Slide the rear mount on the transmission shift rod. Torque bolts to 23 Nm (17 ft. lbs.).
  6. Connect the shift rod rubber washer. Torque bolts to 14 Nm (10 ft. lbs.).
  7. Engage 4th gear. Adjust distance between shift base bushing and shift lever to 5mm by moving the shift base bolts to 23 Nm (17 ft. lbs.).
  8. Reinstall tunnel cover, center console and shift lever knob.

Conversion Time Units: 180

Note: Shift rod linkage and bushing must be lubricated with grease. (Optimally HT or similar) in sliding areas.

Important Notice: Technical Bulletins are intended for use by professional technicians, not a “Do-it-yourselfer”. They are written to inform these technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Special tools may be required to perform certain operations identified in these bulletins. Use of tools and procedures other than those recommended in these bulletins may be detrimental to the safe operation of your vehicle. Properly trained technicians have the equipment, tools, safety instructions and know-how to do a job properly and safely. If a condition is described, do not assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See your Porsche Dealer for information on whether your vehicle may benefit from the information. Part numbers listed in these bulletins are for reference only. Always check with your authorized Porsche dealer to verify correct part numbers.

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