Adjusting drive pinion

Determining total shim thickness „Stot" (S3 plus S4)

(Adjusting preload of tapered roller bearings/drive pinion).

1. Fit tapered roller bearing outer races without adjustment shims into the transm. housing and into the end shield, respectively.

2. Insert fully assembled drive pinion. Place end shield into position and tighten bolts to 25 Nm (18 ftlb).

3. Fit measuring tools. Set dial gauge (3 mm measuring range) to zero at a preload of

1 mm. Length of dial gauge extension is approx. 30 mm.

Determining total shim thickness "Stot" (S3 plus S4)

VW385/17

VW385/17

VW418a

Note

Before carrying out measurements, rotate drive pinion in both directions to allow the tapered roller bearings to settle.

4. Move drive pinion up and down. Read off backlash at dial gauge and record backlash. Do not rotate the drive when moving it up and down as this may give faulty readings. Example: 1.40 mm.

Stot

Pressure

Measuring value

Stot

= Measuring dimension + Pressure

1.60 mm

Determining dimension "e"

1. Insert shims to the determined total shim thickness (1.60 mm for our example) behind the tapered roller bearing outer race into end shield (S4 side). Refit end shield again, tighten bolts and rotate drive pinion into both directions to allow the tapered roller bearings to settle.

2. Set adjustment ring of measuring mandrel VW 385/1 to dimension "a".

~H a

r

Eiüä H A I

5. Remove end shield again.

3. Assemble measuring mandrel acc. to figure.

3. Assemble measuring mandrel acc. to figure.

4. Use dial gauge extension 9150 = 20 mm length.

5. Set master gauge to dimension Ro = 69.65 mm and place onto measuring mandrel. Set dial gauge (3 mm measuring range) to zero at a preload of 1 mm.

6. Turn back moving adjustment ring until it is seated against the stop.

7. Place gauge block plate VW 385/17 onto drive pinion head and insert measuring mandrel into transmission housing. Dial gauge extension rests in the gauge block plate area.

9. Fit final drive cover carefully (do not tap as this may cause the gauge block plate to slide off) and tighten with 4 bolts.

10. Pull second centering sleeve outwards across moving adjustment ring until the measuring mandrel can just about be turned.

11. Turn measuring mandrel carefully until the dial gauge extension is vertical to the face of the drive pinion head. At this point, the pointer of the dial gauge is at its maximum deflection (reversing point) and the dial gauge must now be read. The measured value corresponds to dimension ,,e". Example: 0.46 mm

Determ. thickness of adjustment shim „S3"

(max. dial gauge deflection)

r = Deviation (indicated in 1/100 mm on the ring gear, e.g. 43)

Example:

Reading on dial gage "e"

0,46 mm

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