Sunroof - Wind Noise or Improper Function
87mercedes01TO: OUR MERCEDES-BENZ PASSENGER CAR DEALERS
DATE: July 1987
REF. NO. 77/14
SUBJECT: A. POP-UP SLIDING ROOF DOES NOT MOVE FREELY DUE TO TIGHT SEALS
B. WIND NOISES/OPERATIONAL FAILURE
C. REPLACING POP-UP ANGLE PIECE, SLIDE RAILS, WATER DRAIN RAILS AND TELEFLEX CABLE MODEL 126
In case of customer complaints regarding hard operation, wind noise or improper functioning of the pop-up sliding roof, perform the following procedures.
Refer to Service Microfiche Body Assembly Jobs II, Model 124, group 77.
Before beginning the procedures, remove the sliding roof headliner (job no.. 77-050).
A. Pop-up Sliding Roof Does Not Move Freely Due to Tight Seals
1. Check if there is sufficient clearance between the sliding roof panel and the seals
Use a feeler gauge to measure clearances:
Front 0.15 mm
Sides 0.15 mm (each)
Rear 0.30 mm)
The sliding roof panel should move freely within the roof opening without hanging up against the seals. If clearance is insufficient, remove the corresponding holding rails for the seals and grind down the tabs.
NOTE: Apply Zinc dust Paint to all bare metal edges before reinstalling holding rails.
FIGURE 2:
2. Remove rear view mirror. Close sliding roof panel, position it with (6 mm diameter) centering bolts (see height adjustment rear, job no. 77- 110), loosen nuts, pre-load sliding roof panel forward with special tool 124 589 00 37 00 and retighten nuts (Figure 2).
3. Adjust sliding roof panel (job no. 77-110) . When closing the panel from the "sliding position" (not the "pop-up position") the panel should be flush to, or 1 mm below, roof surface in area of both rear corners and front edge.
FIGURE 3:
B. Wind Noises/Operational Failure
1. Close sliding roof panel (from the "sliding position").
Note: When closing the sliding roof panel, the panel marking (upper arrow) should be in the middle of the rail markings (lower arrows, Figure 3). If markings do not align, adjust teleflex cable (job no. 77-140). If by adjusting the teleflex cable, the markings still do not align, the sliding and pop-up angle pieces must be adjusted.
FIGURE 4:
2. On the side where the marking is too far forward, adjust the sliding angle piece towards the vehicle center (Figure 4).
3. If the adjustment of the sliding angle piece is insufficient, then an adjustment of the pop-up angle piece on the transport bridge is necessary. This adjustment must be done with the sliding roof panel closed.
Note: With a scribe, mark the position of the pop-up angle piece to the transport bridge.
FIGURE 5:
4. Loosen three bolts for pop-up angle piece (arrows, Figure 5).
Tightly push angle piece towards the outside, and depending upon the position of the markings, push angle piece towards the front or rear and retighten.
5. If the marking is always in a different position after closing the panel from the pop-up or sliding position, check the teleflex cable. Do this by grabbing the center of the transport bridge and rocking the bridge forwards and backwards. If there is more than 8 mm of play, replace the teleflex cable (job no. 77-140).
FIGURE 6:
C. Replacing Pop-up Angle Pieces, slide Rails, Water Drain Rail and Teleflex cable
If the procedures in sections A and B did not correct the problem, replace the above-mentioned parts.
1. Remove sliding roof panel (job no. 77-100) and teleflex cable (job no. 77-140). Push transport bridge forward and remove water drain rail (Figure 6).
FIGURE 7:
2. Disconnect left and right side pop-up angle pieces from transport bridge, tilt angle pieces upward and remove sideways towards the inside (Figure 7).
Note: On models C126, before ing the angle pieces, the lateral guide rails on both sides must first be removed from the sliding roof frame (lower arrow, Figure 7).
FIGURE 8:
3. Lubricate moving parts of the pop-up angle pieces with MB lubricant prior to installation.
Note: During installation, ensure that the guide blocks are correctly positioned (arrows, Figure 8).
FIGURE 9:
4. Install pop-up angle pieces in reverse order of removal. Perform basic adjustments by placing special tool 124 589 17 21 (left) and 124 589 18 21 (right) into the guide and groove of the pop-up angle piece (Figure 9).
Note: Remove the adjusting guides only after the sliding roof panel is installed.
FIGURE 10:
5. Rework the left and right covers of the sliding roof panel by cutting away the shaded area with a scissor or razor blade. Dimension "a" = 10 mm Dimension "b" = 3 mm (Figure 10).
FIGURE 2:
6. Install sliding roof panel (Figure 2). Lubricate modified teleflex cable, install and adjust (job no. 77-140).
FIGURE 3:
Operate sliding roof in all positions. Check markings and adjust if necessary (Figure 3).
FIGURE 11:
7. At higher vehicle speeds, if the sliding roof panel hits the wind deflector when closing, the height must be corrected accordingly at the adjustment screw (arrow, Figure 11).
Specified dimension between the sliding roof panel and the wind deflector is 4 mm.
The modified parts are noticeable by the following:
1. Pop-up angle fitting: roller running surface extended by 10 mm.
2. Slide rails: side markings (grooves) are moved back by 8 mm.
3. Water drain rail: two supporting areas in the center of the rail are extended by 10 mm to the rear.
4. Teleflex cable: The spiral wound drive section 1 lengthened from 710 mm to 720 mm.
Special Tools
Group/
Tool Name Tool Number Category Price ($)*
Adjusting guide, left 124 589 17 21 00 77/C 0.13
Adjusting guide, right 124 589 18 21 00 77/C 0.13
Tensioning tool 124 589 00 37 00 77/C 19.83
*subject to change
Parts Information
Time Allowance
Operations A and B
02-7707/01 Pop-up/sliding roof, adjust as necessary
actual time
Operation C
02-7708/70 Pop-up angle fittings, slide rail, water
drain rails and teleflex cable, replace 2.8 hrs.
(with maintenance or repair work)