Rebuilt T-14 Won't spin in nuetral

OK, I never got a reply from Herm, but here is what I have measured.

The main shaft O.D. - .905 "
The needle bearings - .155 "
The input shaft I.D. - 1.22 "

So, with the main shaft and 2 roller bearings (.905 + .155 + .155) that's 1.215. That's .005 " difference between the I.D. of my input shaft and the total O.D. of my main shaft and rollers. Does this sound like it should be OK?

The odd thing is, both sets of Input/Main shafts (each from different trannies) measure exactly the same.

I'm getting tired of having my JEEP this close to being back on the road, only to be held up by .005 of an inch. Pleeeease someone tell me this is OK and I'm barking up the wrong tree, or tell me what is out of whack so I can buy it and move forward....

Thanks again,

Jon

 

.005 clearance is fine on needle bearings this size. Needle bearings are not designed to be a snug fit, they usually have what seems like excess clearance.

 

Makes sense Glenn. I guess that I just wanted to hear that my parts are OK ....

Anyone know a parts source that would have the T-14 input shaft AND would be able to give me the I.D. of the bearing surface of the new shaft?

Jon

 

Let me get this straight you are talking about the input shaft that goes to the crank and then slips over the mainshaft in the trans, the bearings should measure .156 in diameter and they are a sloppy fit, in a t14 they will move around quite a bit when they are new, .001 in diameter on each bearing will make quite a bit of difference. If your shaft looks like there is no appreciable wear then the orignal bearings were wore bad, which is what you want in the transmission, the sacrifical part is the bearing not the shaft. Post pics of what you are talking about, more than likely your bearings are not up to tolerance.

 

Mcruff,

Yes, that is what I am talking about, the input shaft. But, my "brand new, right out of the bag from Herm" bearings measure .155 " dia., not .156". Did you get .156" from somewhere, or did you just fatfinger?

One other thing I would like to add. I did measure, and when all of the roller bearings are in the input shaft, there is a .050 " gap between the first and last bearing. That does seem to be too much.

I'm really at a loss at this point. I'm leaning toward the input shaft being out of spec, but with no real data from anyone, I suppose I will have to start calling part sources and seeing if they can give me the correct measurements for these parts. Herm never responded with any measurements, so I guess I will have to bug someone else.

 

.156 is a standard dimension for needle bearings, let me check my old bearings in the garage. Fatfinger, you got to be kidding, I use micrometers for a living.
.050 is alot (.020-.025 would be betterr) but I do remember when I rebuilt mine that the input shaft was kinda sloppy until the retainer was put on.

 

Mcruff,

Sorry. I meant fatfinger in reference to your typing. I type on a small laptop keyboard all day, and constantly hit the wrong keys...

My dad's a machinist, but unfortunately his skills didn't fall on me....but I am confident that I measured my new needle bearings correctly. I still think that the I.D. of the input shaft is suspect, but I can't pull the trigger on buying a new one until I know for sure. Thanks for helping.