T3 175MM pulley part #'s
Does anyone know the idler pulley bearing part # and the belt part # for the T3 175MM SC pulley kit. I asked at their website and haven't received a response.
Are you looking for the T3 part number of the idler or just the number in the bearing of the idler they sell. I have one on an engine in my garage that I could look at if you just need the bearing number.
I replaced the bearing twice on mine, being careful not put too much pressure on it and only pressing on the outer race when installing, then I bought a replacement idler from them and it went bad shortly too. Ended up getting one of the plastic BMW idlers that everyone recommended and turned it around backwards with some washers to space it out and haven't had an issue, though I haven't been able to put many miles on it yet.
i overtake on roundabouts
i found using a 4ag timing belt idler/tensioner to be great for the supercharger idler/tensioner. only need a couple washers on the rear to space it and a washer in the front to center. you can cut the brackets bit off if you want. being smaller in OD you can also get it up higher which gives more wrap on the supercharger pulley = less belt slip.
yes i still have a handful of aw11's.
Originally Posted by 88Super2 View Post
Mine is unused, and turning it in my hand I can feel some rough spots. I'm sure the bearing supplied by TTT are the cheapest possible. I'd suggest a high quality bearing from NSK, SKF, Timken, Nachi, etc. I would avoid the $3 no-name bearings.
I ended up with the BMW idler mentioned in another thread, O'Rielly's had them in stock and it looks and feels pretty robust. It's also a bit smaller than the TTT which makes re-assembly a bit easier.
Just want to leave this subject with some part numbers that have worked out well for me. I ended up with a 70MM idler pulley from O'Rielly's. It's a Gates replacement for the BMW part mentioned elsewhere. The Gates # is 38071 and cost me $45. Used with the spacer from the T3 idler and a 5K380 belt everything fits perfectly and hasn't made a squeak since.
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