Subject: Crankcase and Related Parts            Models: 911 SC 1983

Bulletin Number: 83 – 06

1983-84 Model Years

A new version crankcase is being used in production as of March, 1983.

Engine numbers are as follows:

911 SC                                  64D3717

911 Turbo (Canada)        67D0712

Part Numbers:                  Old                                         New

911 SC                       930.101.915.00                    930.101.917.00

911 Turbo                930.101.916.00                    930.101.918.00

To increase crankcase strength, the removable oil filter screen and cover plate with oil drain plug have been eliminated.

Fig. 1 Crankcase half

Fig. 2

Oil drain plug is now located on left side of crankcase

Oil pump

With new engine crankcase, a new oil pump is used. This oil pump has a filter screen on the oil pick-up pipe.

New Oil Pumps

Fig. 3     911 SC, P/N 911.107.008.05

Fig. 4     911 Turbo, P/N 930.107.008.04

Fig. 5 Old Oil pump

911 SC P/N 911.008.01

911 Turbo P/N 930.107.008.02

Fig. 6     Intermediate Shaft Bore Cover

Intermediate Shaft Bore Cover

A new intermediate shaft bore cover is also being used. { Fig.6 }. The cover is retained by 2 M6X16 mm hex head bolts and is sealed by an O ring.

Cover                                    P/N 930.105.165.00

Seal                                        P/N 999.701.658.40

Bolt                                        P/N N010 287.1

New Repair Procedures

Parallel Alignment of Camshaft Sprockets

Because of the change in the intermediate shaft cover area, a new method of checking parallel alignment of camshaft sprockets is necessary.

Old Measuring Method:

                                                                                                                Example:  Measured distance A = 78.7 mm

For sprocket of cyl. 1 – 3, we have A + 54.8 mm = 133.5 mm

For sprocket of cyl. 4 – 6, we have A = 78.7 mm

New method

Distance A is measured from front edge of crankcase to face the intermediate shaft.

Design distances between sprockets:

• From face of intermediate shaft to face of rear camshaft sprocket {cyl 1 – 3 } = 98.07 mm
•  From face of intermediate shaft to face of front camshaft sprocket {cyl 4 – 6} =43.27 mm

Design distance plus measured distance A = position of sprockets on camshafts.

Example:             Measured distance A = 35.5 mm

                                For sprocket of cyl 1 – 3 we have:

                                A + 98.07 mm or

                                35.5 + 98.07 = 133.57 mm (+ 0.25 mm)

                                For sprocket of cyl 4 – 6 we have:

                                A + 43.27 mm or

35.5 + 43.27 mm + 78.57 mm (+0.25 mm)

Sprocket adjustment procedure is unchanged.

Normally, 3 shims underneath left camshaft sprocket.

Shim                      P/N 901 105 561 00

• 0.5 mm thickness

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