Body - Retractable Hard Top Won't Latch When Closing

DTB

Date: October 16, 2008
Order No.: P-B-77.37/70
Supersedes:
Group: 77

SUBJECT: Model 230.471/472/477/479, Up to VIN F116593
Vario Roof Does Not Lock When Closing

If you receive customer reports in the above model vehicles that the Vario roof (retractable hardtop) does not lock when closing, the cause may be either the locking arm on the front section of the Vario roof is too high (Figure 1) or there is internal leaking in the left or right loading aid hydraulic cylinder (Figure 2, Pos. 5).










To remedy the issue, perform the following.

1. Close Vario roof and open trunk lid.

2. Check the stop screws on left and right sides of roof mechanism (Figure 3, Pos. 2)







3. If the stop screw(s) do not touch the base of the main bearing of the roof mechanism (Figure 3, Pos. 4), the loading aid hydraulic cylinder on the left or right side must be replaced. Refer to WIS document AR77.37-P-3600R.

NOTE:
- Repair work and fault analysis may require the Vario roof be closed or opened manually (by hand). In order to avoid damage to the Vario roof, please follow the procedure described in WIS document AR77.30-P-6235R. If the Vario roof is lifted out of the trunk by the front section, the mounting surface on the inside (Figure 4, Pos. 8) can become deformed. This may cause the Vario roof to rub beyond the roof frame when it is closed with the roof switch which could cause damage to the seal and paint work.







- As of VIN F116594, a vent bore was introduced into the base of the hydraulic cylinder (Figure 5, Pos. 7) to mitigate the issue.







Parts Information







NOTE: The following allowable labor operations should be used when submitting a warranty claim for this repair. This information has been generated on October 16, 2008. Please refer to Netstar -> Star TekInfo -> Star Time for the most current labor time allowance.

In Case of Warranty

Operation: Warranty Hydr., cylinder, l/side - to activate retract h/top, replace (after test) (77-6641)
Hydr., cylinder, r/side - to activate retract h/top, replace (after test) (77-6642)
Retractable hardtop adjustments, inspect (77-6201)