Subject: Chain Sprocket Support Models: 911 1980
Bulletin Number: 80 – 02
Modifications during 1980 model year: Retrofitting earlier cars
(as of Engine No. 930/07.640.0451) New parts can be installed in earlier cars as follows:
Install chain tensioner, Part No. 930.105.053.00 and add sprocket support, Part No. 930.105.509.00/510.00, together. (Previous chain tensioner, Part No. 930.105.049.00 cannot be used with new sprocket support or vice versa)
- Use either new or old chain housing; however, when installing new sprocket support into old chain housing, part No. 930.105.061.00/062.00, upper chain tensioner support shaft in housing must be polished with a fine polishing cloth
Note:
Both new and old parts are available as replacement parts.
- Chain sprocket supports have wider bearing (1)
- Upper mounting boss (3) on chain tensioner has been narrowed
- Upper mounting shaft (4) in chain housing is now polished.
| Parts | Old | New |
| I Chain Tensioner | 930.105.049.00 | 930.105.03.00 |
| II Chain Sprocket Support, L. Chain Sprocket Support, R. | 901.105.505.02 901.105.506.02 | 930.105.509.00 930.105.510.00 |
| III Chain Housing, Left Chain Housing, Right | 930.105.061 930.105.062.00 | 930.105.061.02 930.105.062.01 |
| Note: Bushing in chain sprocket support is not available as a spare part. |
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