Technical Service Bulletin Nut in Transmission Mainshaft

Subject: Transmission Mainshaft Nut              Models: 911 1972

Bulletin Number: 84 – 02

Nut labeled....

The torque specification for the castellated nut on the mainshaft (M18 x 1.5) has been increased to do 160 Nm (118 ft lb).

This increase has been in effect in production as of January 24, 1984;

                VIN 91 ES 121121

                        91 ES 161110

                       91 ES 170632

During repairs on older transmissions, built as of the 1972 Model Year, torque the nut to the new 160 Nm specification.

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