Scheme for measuring the axial displacement of the secondary shaft to determine the total thickness «Sob» bearing adjusting rings
Press the outer races without taper roller bearing shims into the housings of the crankcase and transmission rear cover.
Reinstall the fully assembled output shaft into the gearbox housing, attach the rear crankcase cover and tighten its fastening bolts to a torque of 2.5 kgf·m.
Fasten the stand VW 387 with the indicator with an extension of about 30 mm, as shown in the diagram.
Install the indicator leg on the support mandrel with a preload equal to 1 mm, and fix the indicator in this position by setting its arrow to zero.
Raise and lower the secondary shaft several times and determine the amount of axial movement on the indicator scale, which, for example, is 1.30 mm.
Warning. Do not turn the secondary shaft when measuring the clearance, as the bearings self-align and the indicator will give incorrect readings.
Calculate Total Thickness «Sob» adjusting rings of bearings according to the formula:
So6 = measured clearance + bearing preload.
The value of the preload of the output shaft bearings is constant and equal to 0.30 mm. Thus
So6 = 1.30 + 0.30 = 1.60 mm.
Lubricate the bearings with gearbox oil and measure the torque resistance with a special dynamometer. It should be for new bearings in the range of 200-400 N cm; for run-in bearings 30-60 Ncm.
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