911 Carrera 4 Cabriolet (996) F6-3.4L (1999)
Balance Shaft Chain: Technical Service Bulletins
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.