Quote:
Originally Posted by sc_rufctr
Is there a specific tool for the 930 gearbox ...?[/I]
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Yes, there are actually two procedures for the 930/30 and 930/33 transmissions.
The procedure similar to the one for the 901, 911 and 915 uses tools Gauge Holder VW 387, Gauge Measuring Lever VW 388, Adjusting Device VW 521/4, washer from P-357 and Gauge Plunger Porsche 9196. Just like the P-tools above, these can be easily fabricated.
Porsche specifies the lever-arm for the measurement as 101 mm but this is from the edge of the VW 521/4 hex. I need to find the dimension of the hex across the flats and add half that value to the 101 mm.
The specified backlash is etched into the ring gear.
Again Porsche specifies checking at four points 90° apart. I like to rotate the pinion one pinion flat at a time for several revolutions of the ring gear.
With all these transmissions, when checking the backlash around the entire ring gear, you are looking for a pattern that might indicate a deformed differential casting. This will show up as less backlash on one side and more on the other side as the ring gear rotates 360°.
Porsche didn’t make a holder for the 930 pinion nut. Porsche recommends wedging a screwdriver between the case and Reverse Gear III, not to my fancy. I made one like P-249 or P-357.
The other method for measuring 930 backlash is at a tooth tip of Reverse Gear III. The procedure uses the washer from P-357 to lock the differential to the axle flange and two CV bolts driven into the side plate to lock the axle flange to the casting.
Backlash specifications for this procedure are not on the ring gear. Specs are 0.33 ±0.10 mm for the type 930/30 and 0.38 ±0.10 mm for the 930/32. These are equivalent to 0.16 or 0.20 mm at the ring gear.
I prefer the ring gear method.
Best,
Grady