Technical Service Bulletin Bearing Bush With Oil Relief Groove Information

Subject: Bearing bush for bearing VIII with oil relief groove  Models: 911 T/911 E/911 S 1970

Bulletin Number: 70 – 10

Vehicle type:                      91 T, 911 E, 911 S

Model year:                        1970

Effective date:                   June 26, 1970

Engine type        Version                                                                                from engine number

911/01                  911 E-C manual transmission                                      620 2413

911/02                  911 S-C manual transmission                                      630 2394

911/04                  911 E-C with Sportomatic                                             620 8429

911/07                  911 T-C manual transmission                                      610 9573

911/08                  911 T-C Sportomatic                                                       610 8365

Spare part stocks overhaul this grove must be machined into the bearing bush on all the following engines. The groove can be cut with a fine-toothed saw blade. When installing, do not use sealing compound on bearing bush VIII.

Spare part stocks of bearing bush VIII must also be modified with the oil relief grove and used before re-ordering.

Part number of bearing bush without groove 901.101.138.02

Part number of bearing bush with groove       901.101.138.03

Engine number ranges which do not include the bearing bushes with oil reliver grove are shown below:

Engine typeEngine number
 From                                                               to
911/01620 0001                                                     620 2412
911/02630 0001                                                     630 2393
911/03610 0001                                                     610 2999&
 610 3501                                                     610 4088
911/04620 8001                                                     620 8428
911/06610 3001                                                     610 3225
911/07610 5001                                                     610 7999&
 610 8501                                                     610 9572
911/08610 8001                                                      610 8364

Dimensions and position of the oil relief groove are shown on the attached drawing.

Key to drawing: a) hole for straight peg

                                b) oil relief groove

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