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Trans diagnosis and repair

H

Hillman

Gold Level Sponsor
I had a serious failure in my SII OD a couple of months ago. I'm going tomorrow to pick up another trans/OD unit. Thinking that before I install anything, I should do what I can to fix it while it's out.

My old trans is in my garage floor. It's from an early series (non-synchro 1st) and probably need synchros into 2nd, at least. While it is sitting on the garage floor (OD removed), I tried side play on the front and rear shafts. Front is close to 1/4 inch and rear is a bit less. Is this normal, WSM really doesn't say?

New one is from a SIII.

I haven't dismantled/inspected a Sunbeam transmission, ever. The last one(s) I did was/were > 40 years ago and early 50s Chevys. I have all the normal tools including a 10 ton press. Will these tools be enough?

I'm guessing I want new synchros reguardless of which trans I use. Does the lateral play in the front/rear shafts suggest new bearings there? Any other 'just replace' parts in the trans? Any other things the WSM doesn't mention?

Thanks

Al
 
R

RootesRacer

Donation Time
The common denominator for your symptom is that the input and mainshaft are coupled by roller needle bearings between the input and the mainshaft.

You will very likely find that your input shaft bearing failed and then the needle bearings got eaten up.
Unfortunately your mainshaft will be trashed from the needles that run on the OD of the input side of the mainshaft.

If this is the case it may be possible to have the front journal ground and a new hardened sleeve installed to the original dimension, otherwise we just lost another potential OD transmission (mainshaft).
 
O

oLD lIMEY

Donation Time
You will need to make 2 dummy shafts ( I used wooden dowles) to hold the rollers in the lay shaft and reverse shaft or they all fall out, not fun. Send me an email and I will copy the page from the shop manual that has the measurements. Boothman@rogers.com. Tony.
 
H

Hillman

Gold Level Sponsor
Well, I have a "new to me" SIII trans & OD. Before I install, I'm planning to tear down, inspect and replace whatever is necessary. Some things, like syncros, I doubt I can diagnose.

Are there any parts you would replace 'just because'? I'm planning new seals, thinking most syncros are gone and maybe giving myself too much credit to recognize a bad bearing. Anybody have a 'just replace' list?

Thanks

Al
 
alpine_64

alpine_64

Donation Time
Seals obviously... And if it's going to be apart I would be inclined to put new synchro rings in even if the others only show minimal wear.
 
fred1725

fred1725

Donation Time
O.D. box

Just FYI
I have an O.D. box that I bought a long time ago and have never used.
It is just the OD not the trans.
I was told it was rebuilt when I bought it but who knows what that means.
So if anyone needs "just the O.D." I have one.

Thanks

Fred
 
NN LeMans

NN LeMans

Donation Time
OD Box

Fred,

Do you still have the OD box you mentioned in your discussion? I have an OD shafted non-synch 4 speed transmission that needs an OD for it.

Thanks
NN LeMans
 
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