[Dilbertnomore]

Hope someone has done the leg work on this.

 

Need to do the cam & balance belts on my '93 968 coupe and want to set the balance belt tension using a Schwaben Universal Belt Tension Gauge. To use the Schwaben Gauge I need to enter a chart with the required belt deflection (mm) and load (daN) to be applied to the belt. Porsche's Tech Specs and Shop Manual don't give the mm/load answer in any form other than what's needed for the #9201 Special Tool. I know the Porsche #9201 tool seeks a properly tensioned Balance Belt reading of 2.7 (which is a 'number' of seemingly proprietary origin and unknown units of measure), but to use the Schwaben alternative (and much less expensive) gauge I need to know what that magic '2.7' equates to in mm/load.

 

Can anyone throw me a life line? Thanks.

 

Rick Arllen

'93 968 Coupe (red/black)

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[Roboman]

http://www.968forums.com/topic/15948-cam...20%20belts


Hi Rick, I see you've been a forum member for 15 years so I hope you won't find this "I don't know but try this instead " answer irritating ...... I'm not sure if that number is in this thread, but the comments should give you confidence that you can get away without using a tensioner on the balance belt. I Hope this helps.

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[Dilbertnomore]

Roboman, thanks for the response. One of the great things about our 968's is the refinement on the belts where the interference critical cam belt's tension is maintained by the hydraulic tensioner. The balance belt, well, I guess, so long as it seems loose and isn't making a wierd noise, just go with the flow. As an engineer, also my background, you can appreciate my hard-wired need to quantify stuff. I do hope someone has or will take a deflection/load measurement on their #9201-checked balance belt the next time they get into it just to give us another option for setting the tension. I'm guessing a fairly high deflection (~6mm) matched with a low load (~1.5-2.0 daN) will be about where the balance belt lives.

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