Campaign - Potentiometer Pivot Shaft, Drilling Pinning
Section8
Group
83
No.
0030
Year
99
Month
08
C70
1999
Campaign 95 H -
Potentiometer pivot shaft, drilling and pinning
Materials
Description Quantity Part no.
Lock pin diameter 4 mm ( 5/32") 1 9438703
length = 24 mm (15/16")
Drill fixture 1 951 2839
Adjustment tool 1 951 2838
LOCKING POTENTIOMETER PIVOT
1
Preparation
With ignition ON, raise cover plate with button on the dash as per illustration.
Make sure the top is in its bottom storage position with the coverplate raised. To make sure, press by hand on the top.
2
Pre Test
Put your hand by the side of the cassette to the convertible top. When your reach the head of the pivot shaft, feel and localize if the flat edge of the shaft is horizontal (level).
If the edge is totally horizontal go to step 7.
3
Connect
Connect the VST to the ODB-2 data link connector (DLC) in the car.
Turn ignition ON (if off).
4
Menu
Start the VST and go to the menu Monitor Test, by selecting Language / Model C70 / 8 Body / CCU / Monitor Test / Scroll List.
Scroll down the list to reach line 22 SI.POT.C = (value).
5
Test
The value in storage position should be between 209-239.
It so, go to step 7.
If NOT, go to step 6.
Note!
The only way to know the actual position is to read the value.
6
Adjust
Put adjusting tool (951 2838) on the head of the pivot shaft and start rotating until the value on line 22 is between 220-228.
Note!
The flat spot will be horizontal when within range.
7
Unhooking link
Disconnect the link for the flap.
8
Installing drill fixture
Note!
In this step it is of extreme importance that the drill fixture is installed so that there is full contact between the drill fixture and the gear segment.
Place drill fixture (951 2839) on the gear segment.
Looking straight down from above the drill fixture (1). No part of the gear segment should be seen on either side of the drill fixture, ensure fixture is centered, see illustration.
9
Placing shim
Place a shim (2) (e.g. washer or equivalent) in the gap between the drill fixture and gear segment assembly.
Use a Vice grip to secure the drill fixture and shim, as per illustration, to ensure alignment of the drill fixture with the gear segment.
Note!
In some cases it may not be necessary to shim.
10
Read this before drilling hole
Note!
The material in gear segment (1) is softer than the material in the pivot shaft (2). Therefore it is important not to apply too much pressure on the drill while drilling or too high drill speed on the drilling machine.
Hint: Use a drop of oil when drilling to avoid broken drill bit. If a drop of oil is used protect the canvas to not be grease or stained.
Warning!
Eye protection must be worn when drilling.
Note!
Drill only 3.0 mm (3/16") deep hole at a time, and then pull the drill out of the hole to discharge the metal chips from the drill flute. Repeat sequence until the full 25.0 mm (1") depth is reached.
After approximately 10.0 mm (3/8") drilling, the pivot shaft will appear (2). At this point, apply only light pressure to the drill. This is to allow the drill bit to slowly cut into the harder material of the pivot shaft.
If for any reason the drill bit is broken off in the hole, a drill bit of better quality must be used to drill out the broken drill bit piece (Diamond Head drill bit).
11
Drilling pilot hole using drill fixture
The hole in the gear segment must be 25.0 mm ( 1") deep. Measure the thickness of the drill fixture, from the entering hole for the drill bit to the bottom of where the hole exits the fixture. Add 25.0 mm (1") to the measurement taken previously (e.g. measured distance + 25.0 mm (1")). Insert a 3.6 mm (9/64" or 0.157") bit into the chuck of the power drill and make a stop on the drill bit with a piece of tape.
Hint: Use a shop vacuum cleaner to collect metal shavings while drilling the hole.
Drill hole until the tape on the drill bit touches the bushing/top surface of the drill fixture.
12
Enlarging hole
Remove drill fixture. Use the hole as a pilot hole, taking care to NOT make it deeper. Enlarge the hole with a 4 mm (5/32") drill to fit the lock pin.
13
Installing lock pin
Remove the drill fixture.
Clean off any metal shavings and de-burr if necessary.
Install the lock pin flush to the surface of the gear segment.
Reinstall the link for the flap.
Operate the top one full cycle to check function.
Read out DTC's and erase if there are any.
Recalibrate the top in accordance with SB 83-0023, Campaign 951.