View Poll Results: TB sits roughly where on gear
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Multiple Choice Poll. Voters: 42. You may not vote on this poll
Timing belt position on gear?
#1
Inventor
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I always assumed that the belt should be in the middle, but I was looking through the WSM, and the pictures show the belt about ⅛" (3mm) from the front of the gear, 16 and 32V. All the pics I could find on Rennlist show approx. the same, unless there is a problem. Worn crank gear, worn bushings, wonky water pump, etc.
Where's yours sit? Pics too, if ya got 'em.
(Multi-choice for multi-owners, one choice per car.)
Where's yours sit? Pics too, if ya got 'em.
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![](https://members.rennlist.com/porken/CamGearsWSM.jpg)
Last edited by PorKen; 01-16-2008 at 05:38 PM.
#4
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I finally did my new 86.5, yesterday, and the tensioner was bone dry, and stuck. The arm bushings were worn, the pulley had play in it, and you can see inside the cup of the tensioner arm, that the tensioner has been twisting the arm (pulley towards the engine). The belt was riding about 3mm from the back, but now rides about 2.5mm from the front.
I think the crank gear has a bit more wear at the front from the twist, and now that's where the belt wants to go? The belt doesn't vary, and isn't trying to move forward, so I think it's OK, but I'll probably replace it. The cam and oil pump gears are in good shape, no shiny spots.
I think the crank gear has a bit more wear at the front from the twist, and now that's where the belt wants to go? The belt doesn't vary, and isn't trying to move forward, so I think it's OK, but I'll probably replace it. The cam and oil pump gears are in good shape, no shiny spots.
#5
Rennlist Member
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Ken..........I voted centre as thats where I put the new belt when installing your tensioner.
I've looked occaisionally through the vent holes since the install but as the belt was good and true never paid much attention as to its exact position.
I'll try to take pics.
I've looked occaisionally through the vent holes since the install but as the belt was good and true never paid much attention as to its exact position.
I'll try to take pics.
#7
Race Director
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Mine is about the 3mm from the front edge.....the few belts I've seen seem to track somewhere between that point and almost to the forward edge of the cam gear?
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#8
Three Wheelin'
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I snapped a couple of pics with my TB adjustment (and thanks to J. Kempf of course). I'd swear I'm near the leading edge of the timing mark or is it trailing. Anyway..here's a pic.
#10
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Nice pics, Malcolm. I don't think my camera could get that.
IIRC, at some point, for S4s, the crank gear was made 1mm wider? I have searched in vain for the posting. Anyhu, that would put the belt even closer to the front, with a worn gear?
IIRC, at some point, for S4s, the crank gear was made 1mm wider? I have searched in vain for the posting. Anyhu, that would put the belt even closer to the front, with a worn gear?
#15
Craic Head
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