professionalpyroman

Hey guys,

rebuilding an s5 transmission and I had a question. I am replacing all bearings and synchros. Synchros are all mazda direct parts. Bearings and seals are from a bearing and seal kit off ebay. The bearing I got for the pilot shaft, NSK 6307, was open on both faces. Both of the old pilot shaft bearings I have from scrapped gear boxes were rubber sealed on both sides. Do you think it would make a difference to run with the open face? I would think the bearing seals would reduce the amount of oil flow that the front transmission seal would have to handle.

Let me know what you think

Turbonut

iTrader: (1)

Factory bearing open both sides. A seal is then installed after bearing(1881-11-404A).

Hot_Dog

Pilot shaft bearing? The pilot shaft bearing is a needle bearing that is pressed into the tail end of the e-shaft. Did you mean "input shaft" bearing? The NSK Deep Groove Ball Bearing 6307 is 35mm I.D, 80mm O.D. This sounds similar to the input shaft bearing. I once rebuilt an S5 NA transmission. I bought my bearings/synchros from Mazda. The input shaft bearing was sealed. If I recall, there were about 9 bearings in total for the NA transmission. Most of the bearings were sealed ball bearings but there were also a couple non-sealed ball bearings.

Turbonut

iTrader: (1)

Geez, if I would have looked up the number would have seen that it certainly wasn't the pilot brg, but the brg in trans, as rebuilding trans.

professionalpyroman

Thats what I meant, input shaft bearing. You don't get much sleep when you have small children