Determining "S4" Again (Transmission G 86)

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NOTE: If only the transmission case cover is replaced, only the adjusting shim "S4" must be measured again.

Clean the housing mating face.
Place the output shaft in the transmission case cover and turn so that the tapered roller bearing settles.
Assemble the measuring tools.
Set the dial gauge (3 mm measurement range) with 1 mm preload to "0".
Carefully remove the special tool VW 387 with the dial gauge.

Fig 1: Removing Special Tool VW 387 With Dial Gauge
Courtesy of PORSCHE OF NORTH AMERICA, INC.

NOTE: Handle the holder and dial gauge with care so that they do not become misadjusted.
Remove the output shaft and outer race of the tapered roller bearing with the pressure plate, adjusting shim and rubber washer, and install them in the new transmission case cover.

Place the dial gauge on the new transmission case cover with the special tool VW 387 as shown in Fig 1 and read off the value on the dial gauge (in the example 0.88 mm).

SHIM S4 THICKNESS CALCULATION - EXAMPLE

Preload		1.00 mm
Read-off value	-	0.88 mm
X	=	0.12 mm
Adjusting shim S4		0.77 mm
Value X	+	0.12 mm
New shim thickness S4	=	0.89 mm

NOTE: If the read-off value on the dial gauge is greater than 1.00 mm, the thickness of the adjusting shim "S4" must be reduced by the value X.

Fit the transmission case cover and check the preload of the tapered roller bearings for the output shaft. Refer to step 2 (Checking the preload of the tapered roller bearings for the output shaft.).