Noises In the Sliding Roof
Noises In The Sliding Roof
Vehicle Type: 911 Carrera (996) / 911 Carrera 4 (996)
Model Year: As of MY 1998 (W)
Equipment: Vehicles with sliding roof I. No. 650.
Concerns: Noises in the sliding roof
Information: Noise problems and their elimination:
This bulletin provides updated specifications for work on the sliding roof and recommendations for eliminating noise problems. Changes to previous publications or newly incorporated texts are indicated in the margin.
Before beginning work a test drive should be carried out, with the customer if possible, in order to locate the origin of the noises and to determine the type of noises. While doing this, move the sliding roof into different positions (open in several positions, closed).
Necessary Material:
Part Number Description
964 555 565 00 Felt strips - meter goods, sufficient for several vehicles.
996 564 950 00 Insulation (set of foam rubber = 6 pieces), sufficient for one vehicle.
Removing sliding roof panel, tilting/sliding roof trim and inner panels:
Procedure: Remove and install sliding roof panel (Figure 1 Item A), tilting/sliding roof trim (headliner flap, Figure Item C) and inner panels as described below.
CAUTION: Rear water drainage channel or sliding roof mechanism may be damaged when sliding roof panel is removed and when moving trim panel of tilting/sliding roof.
- When removing the sliding roof panel, the sliding roof frame must not be moved to the Open position. The trim panel of the tilting/sliding roof must be moved without the use of force.
Removing sliding roof panel:
- Open sliding roof panel approx. 80 mm.
- Disengage trim panel of tilting/sliding roof from the front left and right-hand mounting brackets (drivers) by pressing it towards the rear, and push back approx. 30 mm.
- Close the sliding roof panel and move to tilting position.
- Push trim panel of tilting/sliding roof evenly as far as it will go without tilting it.
- Move the sliding roof panel to zero position (closed).
- Unscrew the four fastening screws T25 M5 x 8 from the sliding roof panel and remove the panel.
Removing tilting/sliding roof trim panel:
- Pull trim panel of tilting/sliding roof forward until the front edge (Figure 2, Dimension X) is approx. 30 mm behind the front roof cut-out edge.
- Disengage left and right sides of inner side panel (Figure 2, arrow).
- Pull out the connector springs (Figure 3, arrow d) on the coulisse at one side and pull out the tilting/sliding roof trim panel upwards on this side.
Removing left and right inner panel:
- Push the sides of the inner panels out of the sliding roof frame inwards to the center of the vehicle (Figure 4, arrows). This is only necessary if inner panels are being replaced!
Sliding roof noise elimination:
Check the bottom of the removed sliding roof panel for pressure marks or chafing damage. If there are pressure marks or chafing damage, check the top side of the removed tilting/sliding roof trim for projecting threaded pins, missing felt strips or loose pieces of foam rubber.
Possible causes may include:
- Threaded parts - Figure 5, arrows 1: Threaded pins too long, touching the sliding roof panel.
- Support points - Figure 5, arrows 2 + 3: Felt strips missing or damaged.
Remedy:
- File down threaded pins (3.0 mm, Figure 5a) so that they are flush with the nuts (a/f 5.5 mm). In most cases, only threaded pins in the front area (left/right) on the inside touch the sliding roof panel and must be reworked.
- Replace felt strips (964 555 565 00). Dimensions: Items 2 and 3 = 15 x 15 mm.
Information: In order to optimize noise insulation, the previous positioning of the pieces of foam rubber on the upper side of the tilting/sliding roof trim panel has been changed.
Previous positioning: 9 pieces of foam rubber (arrows)
New positioning: 6 pieces of foam rubber (arrows) dimensions in mm. Implementation series as of model year 2001 (01).
Possible causes may include:
- Pieces of foam rubber on the upper side of the tilting/sliding roof trim panel (Figures 6 and 7, arrows) loose or missing which are required for noise insulation.
Remedy:
- Securely stick or replace loose or missing pieces of foam respectively.
NOTE: Remove insulation (nine pieces of foam rubber) from all vehicles up to and including model year 2000 (Y), and affix six new pieces of foam rubber according to the dimensional specifications given in Figure 7.
Positioning of the pieces of foam rubber:
Front = 3 pieces of semicircular shaped foam rubber.
Rear = 3 pieces of triangular shaped foam rubber. Part Numbers: The six (2 x 3) pieces of foam rubber can be obtained as an Insulation set with the Porsche Parts Number: 996 564 950 00
Tilting/Sliding Roof Trim Panel - Top side
Possible causes may include:
- Side clearance of the tilting/sliding roof trim too small, making it difficult to move - Figure 8, arrows 5.
Remedy:
- In order to allow sufficient clearance (smooth operation) for the tilting/sliding roof trim panel, file down the mounting tabs (left/right, Figure 8, arrows 5) to the rib width of 2.0 mm (see Figure 8a).
Mounting brackets for the tilting/sliding roof panel - upper side. Sliding roof panel removed.
- Support points - Figure 9, arrows 6 + 7: Felt strips on the mounting brackets (left/right) missing or damaged.
- Replace felt strips (964 555 565 00). Dimensions: Item 6 = 20 x 15 mm, Item 7 = 20 x 6 mm.
Possible causes may include:
- Noise insulation - see Figure 9, arrow 8: Sleeve (hose) of mounting bracket (left/right) moved, damaged or missing.
- Support points see Figure 9, arrows 2 + 3:
- Noise insulation - without diagram Sleeve (hose) of the coulisse-connector springs for installation (left/right) damaged or missing.
Remedy:
- Fit sleeve correctly (Figure 9, arrow 8).
- Replace missing or damaged sleeve with commercially available shrink-fit hose (inner diameter 4.0 mm, length 20 mm).
- Replace felt strips (964 555 565 00).
Dimensions: Items 2 and 3 = 15 x 15 mm (see also description on Figure 5).
- Fit sleeve correctly.
- Replace missing or damaged sleeve with commercially available shrink-fit hose (inner diameter 3.0 mm, length 20 mm).
Wind deflector (F) / support points (left/right).
- Support points - Figure 10, arrow: Felt strips as support (left/right) for the retracted wind deflector (sliding roof panel closed) are missing.
- Stick felt strips (964 555 565 00 - dimensions 20 x 12 mm) on left and right (Figure 10, arrows).
NOTE: The felt strips must project by approx. 2.0 mm at the sides over the support edge of the wind deflector (F) when the deflector is retracted.
Rear water drain.
Possible causes may include:
- Rear water drain - Figure 11, arrows 10+11: Water drain (left/right) touching roof.
Remedy:
- Affix felt strips (964 555 565 00 - dimensions 25 x 25 mm) to the left and right hand sides between the roof and the attached water drainage hose (Figure 11, arrow 10).
- In order to do this, the C-pillar trim panel on the left and/or right side must be removed and the inner roof trim panel (headliner) in the area of the rear window upper edge must be removed by pushing it backwards.
- File the side edge on the rear water drain (left/right - Figure 11, arrow 11) into an angle with a narrow flat file.
Installation: Installing left and right inner panel:
- Push the sides of the inner panel into the groove of the sliding roof frame. You should now be able to move the inner panel smoothly. If not, the inner panel is incorrectly engaged.
Installing tilting/sliding roof trim panel:
- Tilting it to one side, insert the tilting/sliding roof trim panel into the roof cut-out from above, and thread the inner panel into the trim on this side. The other side of the tilting/sliding roof trim panel lies on the coulisse. Pull out the connector spring on this side of the coulisse (Figure 13, arrow d) and insert the tilting/sliding roof trim panel downwards by the side of the spring. Thread the inner panel and lower the trim.
- Position the tilting/sliding roof trim with the front edge approx. 80 mm (Figure 14, dimension X) behind the front roof cut-out edge.
- Engage the inner panel at the left and right sides into the support tab of the tilting/sliding roof trim (Figure 15, arrow).
- Push trim panel of tilting/sliding roof evenly as far as it will go without tilting it.
Installing sliding roof panel:
Information: Install sliding roof panel in the sliding roof frame in zero position (closed).
- Push the side coulisse (Figure 16, arrow D, left/right) backward (clearance compensation approx 2.0 mm).
- Put on sliding roof panel and push forward. Position T25 M5 x 8 fastening screws and tighten the screws slightly.
- Adjust sliding roof panel in line with the roof contour (Figure 17).
Front dimension A = 0 to - 1.0 mm lower.
Rear dimension B = 0 to + 1.0 mm higher.
DV = front roof contour.
DH = rear roof contour.
- Tighten fastening screws T25 M5 x 8. Tightening torque 6 Nm (4.5 ftlb.).
- Move sliding roof to tilting position.
- Pull tilting/sliding roof trim panel forward evenly until a distance of approx. 40 mm to the roof cut-out edge is reached.
- Check that the side inner panels (left/right) are engaged.
Information: The following procedure must be carried out for inner panels which are damaged or have disengaged from the groove of the sliding roof frame:
Remove sliding roof panel and tilting/sliding roof trim panel again. Press inner panel concerned back into the groove of the sliding roof frame or replace damaged panels.
Install sliding roof panel and tilting/sliding roof trim panel again.
- Close the sliding roof panel (zero position).
- Slide tilting/sliding roof trim panel forwards as far as the roof cut-out edge. While doing so, trim panel of tilting/sliding roof must not be pushed upwards. This could disengage and/or damage the inner panels.
- Open sliding roof panel approx. 80 mm. Pull trim of tilting/sliding roof forward until the left and right-hand mounting brackets (drivers) engage. Close sliding roof panel.
Function test:
- Move sliding roof panel to tilting position. The rear edge of the tilting/sliding roof trim panel must now lie gently against the sliding roof panel.
- Close the sliding roof panel (zero position). The trim panel of the tilting/sliding roof must lie against the clamping frame of the roof lining at the front, right and left with a slight degree of pretension. The trim of the tilting/sliding roof must not lie against the rear cross bar of the roof lining. A gap of approx. 0.5 mm (cheque card thickness) must be left - otherwise rattling noises can occur. Pull the clamping frame of the roof lining slightly downward at the back if possible. Do not leave a gap between the rear cross member and the tilting/sliding roof trim panel in vehicles with a fully coated (flocked) clamping frame.
- Carry out a test drive with the vehicle.
Important Notice: Porsche Cars N.A 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.