T3 175MM pulley part #'s - MR2 Owners Club Message Board
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post #1 of 8 (permalink) Old May 6th, 2019, 14:50 Thread Starter
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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.
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post #2 of 8 (permalink) Old May 7th, 2019, 07:43
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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.
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post #3 of 8 (permalink) Old May 7th, 2019, 14:50 Thread Starter
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The bearing part #, it squeals sometimes at startup and I can see the back side of the belt is worn so I'd like to replace it before it locks up.
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post #4 of 8 (permalink) Old May 7th, 2019, 23:20
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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.

-Mike
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post #5 of 8 (permalink) Old May 12th, 2019, 03:13
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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.
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post #6 of 8 (permalink) Old May 12th, 2019, 10:31
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Quote:
Originally Posted by 88Super2 View Post
The bearing part #, it squeals sometimes at startup and I can see the back side of the belt is worn so I'd like to replace it before it locks up.
The bearing number in my tensioner from TTT is a 6300RS. A very common bearing.

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.

Good luck.
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post #7 of 8 (permalink) Old May 15th, 2019, 07:42 Thread Starter
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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.
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post #8 of 8 (permalink) Old May 16th, 2019, 15:02 Thread Starter
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Cool Final Update

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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