Intermediate Shaft - Chain & Seal Modification

911 (996)
10/00 1551

Binder - 1, Engine, Part 2

11-10-00

New Drive Chain and Seal for Intermediate Shaft

Vehicle Type:
911 Carrera (996)1911 Carrera 4 (996)

Model Year:
As of 1999 (X)

Concern:
Drive chain and seal for intermediate shaft modified.

Information:
To reduce engine noise, the drive chain for the intermediate shaft (primary drive) has been changed from a roller-type chain to a tooth-type chain (figure 1). The changes were introduced into production on August 15th, 2000, as of engine number. M96.04 66 1 00501.

The sealing ring on the bearing flange for the intermediate shaft has been changed from an 0-ring (figure 8) to a 4 mm wide sealing ring with three sealing lips (figure 9). The changes were introduced into production on September 12th, 2000, as of engine number M96.04 66 1 02729

Note:
As indicated by the engine number, about 2228 engines in the MY 2001 have the older style intermediate shaft seal. The new style seal, which includes a modified bearing flange, is to be used for repairs on earlier engines. The old style seal is no longer available.

Repair:





Camshaft drive:

The following parts have been changed because of the conversion to the tooth-type chain for intermediate shaft drive:

1 - Drive chain for intermediate shaft
2 - Crankshaft
3 - Intermediate shaft
4 - Chain tensioner

Note:
Roller-type chains remain in use for driving the camshafts.





After existing supplies of the previous parts have been used up, the new parts can be used as replacements for all 911 Carrera (996) and 911 Carrera 4(996) engine types M96.01, M96.02, and M96.04.

A mixed configuration is not permissible, as the parts are matched with each other. The previous chain tensioner, part No. 996 105 180 54, is still available and may continue to be used on engines that have the previous style drive chain installed.





The marking on the head of the chain tensioner is unchanged (1-ring, arrow).

New intermediate shaft seal.

There is a wider groove in the intermediate shaft to accommodate the new sealing ring. The new sealing ring is rectangular (previously: O-ring) and approx. 4 mm wide on the sealing surface (arrow, figure 3).





The new sealing ring is an integral part of the bearing flange and cannot be individually replaced.

The new intermediate shaft-bearing flange with rectangular sealing ring is available for repairs on all engines with a roller4ype or tooth-type chain. The new bearing flange (part number, 996.105.017.01) is available only with the sealing ring fitted. The sealing ring cannot be replaced individually. The previous bearing flange with O-ring must no longer be installed.





Parts Information:

Literature:
911 Carrera (996) Technical Manual, Group 1 Repair:
13 49 37 - Disassembling and assembling crankshaft and intermediate shaft
15 23 19 - Removing and installing bearing flange (sealing ring) for intermediate shaft - engine installed
Technical Information: No.11/99 - Micro-encapsulated screws on the engine.