The Stovebolt Site Forums The Shop Area Driveline SM420 Countershaft front bearing

Have a rebuild kit from Novak. I pressed out the old countershaft front bearing and the one in the kit is way loose. I did not need to press it in and I can move it freehand

Is this normal?

I have to doubt it

Sent the PM BS.
dg

There were two different countershaft bearing sizes, the smaller being the most common. it should be a snug fit. You will just need to get the numbers off the old bearing and get one that way.

The kit comes with two and the smaller (2412) one is enclosed on one end and would never fit.

the larger bearing in the kit is snug -

I see that the larger one comes as a 1206 or 2414

The one I took out was 1206 - as is the one Novak sent.

I will use loctite bearing as the previous post noted.

What is odd is that the kit came with

(2) Countershaft Front bearings (2412 and 1206)
1 Countershaft Rear

and three others 6307, 6209 and 6208 - for 2 spots

I may be a bit slow on the take, but I find a parts list, or better instructions would have been helpful from Novak. The OLD CHEVY Manual is 10 times better

It wil be trial and error on those three bearings on the main shaft

Don't get confused by the extra parts. The same kit is made up
to encompass all of the models. You will have some left over
parts. It's still better than having to chase down all of the
parts separatly on your own.
All you have to do is match up the old bearings with ones that
come in the kit from Novak.
DG

Looks like the only part I am missing from my "transmission in a bucket" is the Oil Deflecter for the rear countershaft bearing.

I found one at Collectors Auto Supply fo $10.

Once I get a spanner wrench ( i think it is 1 1/2 inch) I should be cookin with gas

Or, you can make one as I did using a piece of heavy wall
tubing, some 1/2" rod and a couple of dowl pins.
http://www.pbase.com/dennygraham/image/137529461
Denny G

Clearly Denny knows the concept when they say "Necessity is the mother of invention".

Only wish I had an "inventors" mind Dave. My bathroom reader for
this month is a book by Ronald Clark titled "EDISON, the man
who made the future." Now there was was one inventive individual.

Denny G

Well Thomas Edison was a regular user of Vin Mariani and of course he did not have 300 channels of TV to distract him.

We all have Edison potential - we just opt not to indulge in cociane and alcohol, instead we watch Dancing with the stars and Nascar

So that spanner nut is on there with some force. I know it is left hand threads - but boy it is tough to crack.

Yep, that's why the 1/2" levers are on the one I made, came
right off with the spanner I have pictured.

DG

I used some 1/4 inch steel and drilled a 1 3/8 hole in the middle, tapped in two 1/4 inch steel bolts on each side.

But just bending the bolts - I had SS bolts and will now try hardened steel.

I also went to a local Drivetrain shop and transmission shop - both did not want to try and get it off - afraid of screwin it up.

So that did it - a knuckle buster- - no off the shelf Spanner wrench was gonna get that off.

I am thinking of using some loctite on that nut when I put it back together.

Then you'll have one heck of a time getting it off the next
time. No need for Loctite just snug it up as tight as you can
get it with your spanner.
Oh and by the way, that was why I used the dowel pins.

Denny G

Anyone have a pic on how the rear oil seal is on the sm420?

I scanned denny's site but did not see the seal

is that seal only used in NON-Torque Tube applications??

I believe you have a '53, 3100? There is no rear seal in the SM420.
Check you fluid level in the trans several times once you start
driving it till it stabilizes.

Denny G.

I see part 48 in the exploded view here

sm420 View - 1954

Yes I have a 53 so maybe this does not apply

That is only used on open drive shaft transmissions.