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90 S4 Belts

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Old 07-02-2011, 04:56 PM
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Bilal928S4
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Default 90 S4 Belts

I have currently on the car the following belts
13x1085 (Porsche part number 999 192 363 50)
13x1000 (Porsche part number 999 192 286 50)
13/12.5x925 (Porsche part number 999 192 306 50)
6PK 858 (Porsche part number 998 192 266 50)
The belts I got from Jeanie are as follows
12.5x1080 (Porsche part number 999 192 335 50)
13x1000 Conti
13x950 Conti
6PK 858 Conti
So the belts with the same numbers is a no brainer. What about the other two. Should I use them or get the correct sizes?
Thanks and have a great weekend.
Old 07-02-2011, 08:27 PM
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ROG100
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Bilal,
You should have the following : -
Alternator = 999 192 347 50 - 6PK875
PS = 999 192 286 50 - 13 x 1000
AP = 999 192 306 50 - 13 x 925
AC = 999 192 335 50 - 13 x 1080

For some reason the AC belt on some 90+ cars does not tighten well so we also have a 999 192 335 50A as an alternative which is 13 x 1075.
Hope that helps.
Roger
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Old 07-02-2011, 09:53 PM
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Default I'm one of the odd ones....

Originally Posted by ROG100
Bilal,
You should have the following : -
Alternator = 999 192 347 50 - 6PK875
PS = 999 192 286 50 - 13 x 1000
AP = 999 192 306 50 - 13 x 925
AC = 999 192 335 50 - 13 x 1080

For some reason the AC belt on some 90+ cars does not tighten well so we also have a 999 192 335 50A as an alternative which is 13 x 1075.
Hope that helps.
Roger
In more ways than one....My AC runs the 1075. Why?...I have no idea.
Old 07-02-2011, 10:37 PM
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Originally Posted by ROG100
Bilal,
You should have the following : -
Alternator = 999 192 347 50 - 6PK875
PS = 999 192 286 50 - 13 x 1000
AP = 999 192 306 50 - 13 x 925
AC = 999 192 335 50 - 13 x 1080
...
Roger, a question on alternator belts: The OP has a 6PK 858 alternator belt ('266 part#), you referenced a '347 part# (6PK 875).
And PET shows both-- '266 for a manual, and '347 for an auto (except calls it a 872, not 875).

I understand your preference for the '347 but why the difference? The pulleys are the same (according to PET), the belt doesn't connect to the transmission, I don't get it.

(And if Bilal currently has '266 alternator belt, then isn't that what he needs?)
Old 07-02-2011, 11:00 PM
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According to Porsche PET : -
Manual cars 90 to 95 = 266 50 - 6PK 858
Auto cars 90 to 95 = 347 50 - 6PK 872

875 v 872 a readily availabe alternative to the exclusive Porsche size at a lot cheaper price.
Last time I checked Bilal's car is an auto.

Answer Manual v Auto no idea 8>)

There could be for what ever reason some differences in crank pulley.
Old 07-02-2011, 11:15 PM
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jcorenman
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Originally Posted by BerNard94
during my 1990 porsche increased crankshaft pulley diameter from 134mm to 142mm on m249 cars.
Aha, thanks!! They must have needed to make up for all of the transmission losses
Old 07-03-2011, 02:40 AM
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Bilal928S4
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Thanks to all. The belts fit well. I will crank it in the morning and hopefully everything works fine.
The power steering belt is tight. The adjuster does not give enough slack to get the belt off. I have to undo the pulley on the pump, take the belt off, put the new belt on and put the pulley back on.



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