Ro - estimated distance between the end face of the drive gear and the axle of the differential, equal to 59.65 mm; r - variable correction to the nominal position of the drive gear; R - the actual distance between the end face of the drive gear and the axle of the differential
Adjustment of the distance between the end of the drive gear and the axle of the differential is achieved by selecting the thickness of the adjusting ring «S3» (see diagram), mounted behind the shoulder of the outer wheel of the front output shaft tapered roller bearing, and the adjusting ring «S4», installed between the rear crankcase cover and the outer ring of the rear output shaft tapered roller bearing.
Scheme for adjusting 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: S1 and S2 - adjusting rings of the side clearance in the meshing of the main gear gears; S3 and S4 - adjusting rings for the distance between the end face of the drive gear and the axle of the differential
Note. The adjustment of the distance between the end face of the drive gear and the axle of the differential must be done again when replacing the driven gear of the final drive and the secondary shaft. In case of replacement of other parts that affect the position of the drive gear (and, consequently, the output shaft), perform the adjustment on the basis of measuring the installation position of the output shaft, made before disassembling the gearbox.
Correction Definition «r»
Correction Definition «r» is carried out if its value is not marked on the driven gear and if parts that directly affect the position of the final drive gear are to be replaced (both tapered roller bearings, output shaft, gearbox housing). Work is done before removing the gearbox.
Remove differential as above.
Set up and equip as indicated in the paragraph below «Adjusting the distance between the end face of the drive gear and the axle of the differential». measuring mandrel VW 385/1.
Measure the amount of correction «r», which, for example, is equal to 0.18 mm. After replacing parts, adjust the position of the pinion gear as follows. When determining the thickness of the adjusting ring «S3» take into account the measured correction value «r».
Scheme for measuring the correction value «r»
Adjusting the distance between the end face of the drive gear and the axle of the differential
Install the adjusting ring «Sj» calculated total thickness (in our example «Sob» 1.60 mm) under the outer ring of the rear tapered roller bearing of the output shaft.
Install the rear gearbox housing cover.
Rotate the output shaft several times in both directions
Adjust the adjusting ring of the measuring mandrel VW 385/1 to the size «A» (see diagram), equal to 50 mm.
Attach an indicator with a 9.3 mm extension to the measuring mandrel (fixture VW 365/27).
Install the adjusting gauge VW 385/27, providing the calculated distance between the end of the drive gear and the differential axle «Ro», equal to 59.65 mm on the measuring mandrel and adjust the indicator to the zero position with the stem preload equal to 1 mm.
Slide the movable adjusting ring all the way.
Install the adjusting plate VW.385/17 on the pinion head.
Remove the adjusting gauge and insert the measuring mandrel into the gearbox housing. directing the VW 385/2 washer towards the differential bearing cap.
Install the differential bearing cover and press down by tightening the four mounting bolts.
Pull back the second shim as far as possible using the movable adjusting ring so that the measuring mandrel can be turned manually.
Turn the measuring mandrel so that the indicator foot rests against the measuring plate mounted on the head of the drive gear, and the indicator needle deviates as much as possible (to the starting point 8 in the opposite direction). Let the value thus measured «r1» was 0.46 mm.
Calculate the thickness of the adjusting ring «S3» according to the formula
S3 = r1 + r
Where
r1 - measured value according to the maximum deviation of the indicator pointer;
r is the value of the correction to the nominal position of the final drive gear.
Example «r1» equal to 0.46 mm; «r» - 0.18 mm.
S3 = 0.46 + 0.18 = 0.64 mm
Since the limits of tolerances for the thickness of the adjusting rings are known, in all cases it is possible to accurately select the calculated | adjusting ring thickness «S3».
Calculate the thickness of the adjusting ring «S4» according to the formula:
S4 = So6 - S3
Example. So6 is equal to 1.60 mm.
S4 = 1.60 - 0.46 = 0.96 mm
Measure the thickness of the adjusting rings with a micrometer at several points. Make sure that they do not have burrs or other defects. Install only good quality rings.
Checking the adjustment of the distance between the end face of the drive gear and the axle of the differential
Install the output shaft, press in the outer races of the bearings, placing the matched shims «S3» And «S4». Rotate the output shaft in both directions.
Install the universal measuring mandrel and take control measurements.
With correctly selected adjusting rings, the indicator should show the amount of the correction «r» with a deviation of±0.04 mm.
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