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serpentine belt tensioner for early 1997 A8Q

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serpentine belt tensioner for early 1997 A8Q

Old 11-04-2018, 07:27 AM
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Default serpentine belt tensioner for early 1997 A8Q

I'm confused about the ribbed belt tensioner. 8/96 build date, Canadian A8Q. I think my tensioner is going, since the belt squeals for a few minutes on cold startup only. I can make it louder or softer by turning on or off the A/C (few month old compressor). The belt itself is maybe a year old. Looking up a tensioner, part # 077903133E (077903133C) comes up. I see prices from over $200 to $10.



The picture looks strange to me, since mine looks like this installed on the car (using silverd2's photo from thread https://www.audiworld.com/forums/a8-...moval-2820909/ .



Is the 1st picture above of the right part? Where is the large silver cylindrical part hiding in silverd2's photo? And it seems like the 1" thick cylinder just left of the allen wrench just above seems to be doing the tensioning, no? I seem to recall it pushing in easily but taking a long time to come back out, when I had the front off the car.
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Old 11-04-2018, 07:36 AM
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and what is the bent little rod sticking through?




Also, the various ebay offers selling 077903133E seem conflicted about what it fits.
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Old 11-04-2018, 08:30 AM
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Old 11-04-2018, 12:23 PM
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If it's the same as the facelift part you can put on an idler from a Hyundai 2.7L DAYCO Part # 89010 or GATES Part # 38027, around $15. The size appears to be 82mm x 17mm x 25mm (or 26mm) Application (among others) 2001 HYUNDAI SANTA FE 2.7L V6

This is cheaper than buying the whole tensioner assembly. It's important to replace there before the grease migrates out and they run dry, overheat and fall apart. The static idler on the LH side of the engine lasts a lot longer but I'd replace it by 150K at least also. Both of these can be repacked with grease and they'll last a lot longer but in my case the tensioner roller was pretty worn and seemed good to replace around 150K.

I have the Hyundai roller on both of my D2s, many miles, no problems.
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