I checked my files. There is a Porsche Technical Bulletin on this, I uploaded it here:
http://www.pelicanparts.com/techarticles/Boxster_Tech\16-ENGINE-Camshaft_Swap_and_Chain_Tensioner/Gp1800.pdf
The tech bulletin says:
Quote:
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 numbers:
M96.22 65 1 00501 2.7 liter
M96.21 67 1 00501 3.2 liter
The sealing ring on the bearing flange for the intermediate shaft has been changed from an O-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 numbers:
M96.22 65 1 02353 2.7 liter
M96.21 67 1 02086 3.2 liter
Note: 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.
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.
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But, most importantly, it says:
Quote:
After existing supplies of the previous parts have been used up, the new parts can be used as
replacements for all Boxster engine types M96.20, M 96.22, and M96.21.
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.
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Which leads me to believe that you shouldn't install the new tensioner with the old style chains. I remember now, when putting the book together, there was too much confusion to make a recommendation that might have ended up being incorrect in the long run.
Anyone have any more experience with this?
-Wayne