Subject: Mainshaft Seal And Guide Tube Models: 911 1976
Bulletin Number: 85 – 01
As of the blow VIN’s, the seal and guide tube were modified:
914ES121832 – Coupe
91XES161758 – Targa
918ES1170968 – Cabriolet
999.113.283.40 – Seal
915.116.087.03 – Guide Tube
999.113.327.40 – Seal
915.116.087.04 – Guide Tube
The new seal has an additional dust lip and its location in the guide tube has been moved 10mm to assure proper alignment with the shaft.
In case of repair, you should be aware of the following:
- Only the new seal is available
- The new guide tube can be installed in all older models including M.Y. 1976.
- The main shaft with shorter sealing surface were factory installed on transmission up to M.Y 1976 (Fig. 2)
- Transmissions as of Model Year 1976 could be field repaired using a main shaft with a shorter sealing surface.
Therefore, it is very important to measure the sealing surface (Fig. 2 and 3) before guide tube replacement.
I – Old version mainshaft
II – New version mainshaft
Due to the different location of the seal in the guide tube, the installation tool has been modified (was P381, now P381a).
The old seal installation tool P381 must be used for the old version tube (40mm) and P381a only for the new version (50mm)
Since P381a has a guide tube for the oil seal, the guide sleeve should be held in a vise during the seal installation (Fig. 6) and not on a flat surface.
Coordination of Parts
|Guide Tube – Old 915.116.087.03||Guide Tube – New 915.116.087.04||Seal – New 999.113.327.40|
|Mainshaft with small sealing surface||X||–||X|
|Mainshaft with large sealing surface||–||X||X|
Note: Before installation of the guide tube/seal into transmission, fill seal between the two lips with chassis grease.
The seal of the guide tube is the same as before, with O-ring, #999.701.359.40
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