Adjustment principle
The distance between the axis of the differential and the end face of the drive gear determines the location of the contact patch in the meshing of the final drive gears. When installing the output shaft in the gearbox, this distance affects the degree of wear and noise of the final drive gears. Therefore, it must be adjusted with great care using a special tool.
The initial value for adjustment is the calculated value of the distance between the axis of the differential and the end face of the drive gear (size «Ro», see diagram), corrected by the amendment «r», determined during the manufacture of the drive gear. The adjustment consists in placing the adjusting ring S3 of the required thickness under the outer ring of the rear output shaft bearing to displace the drive gear in the gearbox housing.
Scheme of installation of measuring instruments for calculating the distance between the end face of the drive gear and the differential axle: 1 - measuring mandrel VW 385/1; 2 - measuring mandrel VW 385/2; 3 - indicator rod VW 385/13; 4 - indicator extension VW 385/16; 5 - support mandrel of indicator leg VW 385/33
Determination of the correction value «r»
Note. This measurement is made if there is no correction mark on the driven gear of the final drive «G» in hundredths of a millimeter from the nominal position of the drive gear, and also if there has been a replacement of parts that directly affect the position of the drive gear of the final drive: the rear double-row tapered roller bearing of the output shaft, the crankcase or the rear cover of the gearbox, the bearing of the 1st gear gear.
Remove the gearbox rear cover.
Install a special adjusting washer VW 381/11 and fix it strictly at a right angle relative to the output shaft by hand-tightening two M8x50 bolts.
Tighten the bolts to 20 Nm using a torque wrench.
The drive gear, after tightening the bolts, is in position. which she occupied with the rear gearbox cover installed. This operation must be carried out very carefully whenever the distance between the end of the pinion gear and the axle of the differential is adjusted.
Remove differential.
Install the measuring mandrel VW 385 in the clutch housing (calibrated for preload 2 mm) on «zero» using the VW 385-3G indicator.
Determine the estimated size «r», which is a deviation from the size «Ro».
When replacing parts by selecting the thickness of the adjusting ring, achieve the maximum possible accuracy of maintaining the resulting size «r».
Adjustment and measurement of the distance between the end face of the drive gear and the axle of the differential and the side clearance in the meshing of the final drive gears: 1 - rear tapered roller bearing of the secondary shaft; 2 - differential bearing; 3 - clutch housing; Ro - estimated distance between the end face of the drive gear and the axle of the differential; d - correction to the estimated distance between the end face of the drive gear and the axle of the differential (applied to driven gears supplied as spare parts); S1, S2 - differential bearing preload adjusting rings; S3 - adjusting ring for the distance between the end face of the drive gear and the axle of the differential
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