TORQUE CONVERTER
The torque converter is equipped with a lock-up clutch. The lock-up clutch is closed load- and speed-dependant with minimum pulsations and mechanically drives the 3., 4. and 5. gear independent of slip.
TORQUE CONVERTER, IDENTIFICATION
Different types of torque converters exist. Identification is performed via code letters (arrow). (Scheme 104)
Scheme 103
Allocation of torque converter/transmission see CODE LETTERS, ALLOCATION, RATIOS, EQUIPMENT .
TORQUE CONVERTER, CHECKING
Checking converter hub for wear grooves (arrow). (Scheme 105)
Scheme 104
Note. The torque converter is welded in and must be completely replaced if damaged or in case of malfunctions.
Scheme 105
- VAG1358A - oil siphoning unit
- V.A.G 1358 A/1 oil siphoning probe (Scheme 106)
In case of soiling of the ATF via shavings or during a major transmission overhaul, torque converter must be drained.
Draining Torque Converter
Drain ATF from torque converter using VAG1358A and oil siphoning probe VAG1358A/1. (Scheme 107)
Scheme 106
Scheme 107
- VW681 extractor lever
- 3295 thrust piece see scheme 25
Tightening Drive Pinion Nut & Adjusting Friction Torque
Install 3304 retainer using two hex bolts M8 x 30.
When tightening nut, support final drive (e.g. using VAG1359/2 universal mount with VAG1383A transmission hoist). (Scheme 109)
Scheme 108
Always replace drive pinion nut.
Tighten nut for drive pinion until no more drive pinion backlash is present.
Tighten further until specified friction torque is attained; while tightening measure friction torque multiple times. see scheme 73
Note. If the specified friction torque is surpassed, replace spacer sleeve and repeat adjustment! Any spacer sleeve that has been pressed together too far one time must be replaced.
Measuring Friction Torque
Adjust to following friction torque. see scheme 73 See FRICTION TORQUE ADJUSTMENT table.
Scheme 109
| Application | Adjustment - INCH Lbs. (Ncm) |
|---|---|
| New Bearings | 17.7-22.13 (200-250) |
| Run-In Bearings (1) | 5.31-2.66 (30-60) |
| (1) Have been run in at least 50 km. | |
| (1) | Have been run in at least 50 km. |
FRICTION TORQUE ADJUSTMENT
Measuring Friction Torque (Check Measurement)
- Drive pinion removed
- Differential installed with shims "S1*" and "S2*"
Position torque gauge 0 to 600 Ncm -A- on differential. see scheme 98
Scheme 110
Read friction torque.
Friction torque specified values. See RING GEAR FRICTION TORQUE table.
| Application | INCH Lbs. (Ncm) |
|---|---|
| New Bearings | 13.28-26.55 (150-300) |
| Run-In Bearings (1) | 5.31-2.66 (30-60) |
| (1) Have been run in at least 50 km. | |
| (1) | Have been run in at least 50 km. |
RING GEAR FRICTION TORQUE
- Tapered roller bearings for differential are low-friction bearings. Therefore friction torque can only be used for check measurement in a limited way. A correct adjustment is only possible by determining the total thickness "Sges".
- Do not grease new tapered roller bearings additionally for friction torque measurement. The bearings are already greased with a special oil from the factory.
- For a new adjustment of the gear set, the drive pinion adjustment should now be checked. See «DRIVE PINION, ADJUSTING»(ref-172253-S42058028372005022400000) .