Pre-Tension On Ball Bearing, Adjusting, Left Flange Shaft
The pre-tension on the left flange shaft ball bearing must be optimized only on certain vehicles. Refer to the table for a list of the vehicles. Refer to Installing .
This is not necessary on vehicles built later because they have been redesigned.
- The left flange shaft is removed. Refer to LEFT FLANGE SHAFT, REMOVING AND INSTALLING .
- Bearing bracket with wear pattern "B". Refer to LEFT FLANGE SHAFT BALL BEARING PRE-TENSION, CHECKING - "Wear Pattern B" (traces of wear if necessary with material erosion all around the hole).
- The bearing bracket and ball bearing must be replaced. Refer to LEFT FLANGE SHAFT BALL BEARING MOUNTING BRACKET, REMOVING AND INSTALLING
Procedure
-- Clean off any dirt and corrosion from the contact surface -arrow- using 150 grain sand paper.
It is not necessary to sand the contact surfaces all the way down to bare metal. It is enough to just remove any dirt and corrosion.
-- Clean the contact surface and bearing seat.
-- Install the new left flange shaft ball bearing -arrow- into the bearing seat.
Next procedure:
- By bearing oversize (the bearing sticks out slightly above the contact surface). Refer to "Procedure if there is Bearing Oversize " below.
- With bearing undersize (the bearing sits deeper than the contact surface). Refer to "Procedure if there is Bearing Undersize " below.
Procedure if there is Bearing Oversize
-- Place Straight Edge - 500mm VAS6075 straight across the bearing and determine the distance to the contact surface on the transmission housing on both sides with the feeler gauge.
-- Write down the measured value.
-- Place the straight edge 90° offset across the bearing and determine the distance to the contact surface on the transmission housing on both sides with the feeler gauge.
-- Write down the measured value.
Selecting the shim(s):
Use the smallest value take from the four values to select the shim(s).
- Specified value, bearing oversize = 0.5 to 0.8 mm
| Smallest bearing oversize (example = 0.1 mm) | |
| + | Shim(s) thickness, (thickness = 0.3 mm) |
| = | Bearing pre-load, (specified value = 0.5 to 0.8 mm) |
Example:
1 shim:
0.1 mm + 0.3 mm = 0.4 mm, "bearing pre-load is too small"
2 shims:
0.1 mm + 0.3 mm + 0.3 mm = 0.7 mm, "bearing pre-load is in the specified range"
- Result: Insert two 0.3 mm shims to reach the bearing pre-load = 0.7 mm within the 0.5 to 0.8 mm specified value.
Procedure if there is Bearing Undersize
The bearing undersize can only be determined in the described procedure.
-- Place Straight Edge - 500mm VAS6075 straight across the contact surface on the transmission housing and measure the distance to the bearing on both sides with a feeler gauge.
-- Write down the measured value.
-- Place straight edge 90° offset across the contact surface on the transmission housing and measure the distance to the bearing on both sides with a feeler gauge.
-- Write down the measured value.
Selecting the shim(s):
Use the largest value take from the four values to select the shim(s).
Enter the measured bearing undersize as negative value ("-") into the calculation.
- Specified value, bearing oversize = 0.5 to 0.8 mm
| - | Larger determined bearing undersize (example -0.15 mm) |
| + | Shim(s) thickness, (thickness = 0.3 mm) |
| = | Bearing pre-load (specified value = 0.5 to 0.8 mm) |
Example:
1 shim:
0.15 mm + 0.3 mm = 0.15 mm, "bearing pre-load is too small"
3 Shims:
-0.15 mm + 0.3 mm + 0.3 mm + 0.3 mm = 0.75 mm, "bearing pre-load is in the specified range"
- Result: A 0.75 mm bearing pre-load within the specified value of 0.5 to 0.8 mm is reached by installing three 0.3 mm shims.
Continuation for all
-- Replace the bearing bracket, the ball bearing and the circlip. Refer to LEFT FLANGE SHAFT BALL BEARING MOUNTING BRACKET, REMOVING AND INSTALLING .
-- Insert the determined number of Shims 0B4 409 227 -item 1- into the bearing seat on the transmission before installing the flange shaft.
-- Install the left flange shaft. Refer to Installing .