M35 tranny input shaft

Hi everbody, have just joined SS, suprb site.
I have a howling input shaft bearing on transmission, would like advice on repair and part no,s etc, and where to get parts.
I am in Lancashire in U.K.

Welcome to this very best MV forum.
You’ll have to remove the transmission from the truck. To lower the tranny after removing the floor cover I use a chain hoist hanging from a 4x4 pole crossed over dash and cab rear wall.
Input shaft and main shaft bearings are the same: BL308ZNR, (90x40x23), 11 balls.
Countershaft has one ball bearing BL307ZNR, (80x35x21), 12 balls and one roller bearing C 1207 (WK) (72x44(shaft dia.)x17). Also check the condition of the 14 rollers (5/16dia.x9/16) between input and main shaft. Any bearing and seals store should be able to get those parts.
If you don’t have access to the manual I could send you the corresponding pages.

Hope this helps.

Gerhard

Tranny bearings

Gerhard
My bearing stockist doesn,t recognise the bearing no,s, but has found them by the sizes. They seem to think the roller bearing C1207 should be (72x35x17) not (72x44x17) as you quoted in your post, could you let me know if this is right or wrong! Also have these bearing got circlip grooves in them!
Thanks
Dave
M35A1 CARGO

Tranny bearings

Gerhard
My bearing stockist doesn,t recognise the bearing no,s, but has found them by the sizes. They seem to think the roller bearing C1207 should be (72x35x17) not (72x44x17) as you quoted in your post, could you let me know if this is right or wrong! Also have these bearing got circlip grooves in them!
Thanks
Dave
M35A1 CARGO

OK Dave,

We aren’t bearing specialists but they should know at least what every NTN or SKF catalog shows!
I.e. a std. 90x40x23 ball bearing (8 balls) with groove and ring (NR), protected on one side (Z) would be Nr. 6308 Z NR. The same size bearing comes in a “maximum load capacity” with 11 balls and the Nr. BL 308 ZNR. If they only can find the ZZ type (which means both sides protected) you just remove the cap on the outer side (ring&grove side). Same case for the smaller BL 307 ZNR.
I strongly recommend to get the heavy duty type, it costs more but will last much longer, and it comes from factory in the SPICER 3053A fifth o.d. tranny.
About the roller bearing: First make sure you really need a replacement, usually they last very long, unless you had your tranny sitting full of rain water. This bearing is specific and doesn’t come with an inner race because the rollers work directly on the countershaft surface which should be 1.732” (43.99mm)dia. The exact dimensions are 72.00x44.053x17.00. You may also check at auto parts stores. Federal Mogul has it under M 1207 EL and American Bearing puts C 1207 on the box and HYATT 1207 WK on the bearing itself. Do not buy the common UN or NJ 207 roller bearing (D=72xF=43.8xB=17) unless you want to take your countershaft to a machine shop to have it ground down to 43.76mm. (It is an option if it is severely corroded or worn out)

Good luck finding your parts!

Gerhard

M35 input shaft

Gerhard
Thanks for further info, the numbers over here are M for heavy duty which makes M308ZNR, and M307ZNR. They don,t know about the roller race, and can,t find stockist for 5/16x9/16 rollers, (knowing my luck it,ll be the rollers thats "goosed") so i,m going to strip box and see what i find. I find it strange an American truck has so many metric parts i.e. bearings and oilseals, and i can,t find imperial size rollers in England!.
Keep up the good work
Dave.

If you need to, you can order the bearings from Saturn Surplus or Memphis Equipment. I believe Boyce also carries them.
Often, you can buy the bearing replacement kit that has all the bearings needed for the transmission.

Another thing, are you sure it is the bearings? If the noise is there in 5th (OD) and 4th (direct), it is probably the front or rear tranny bearing. If there is no noise in 4th, you could have the intermediate bearings, or a bad gear.
When you get it torn down, let us know. We Yanks can help you find the parts you need!

Family!

rdixiemiller,

Did you catch the significance of the conversation above?

You have a very knowledgeable gentleman from South America, helping a very knowledgeable gentleman fom the United Kingdom, fix a problem with a North American Military vehicle, useing an American website!

It is a beautiful thing!

LH, I think thats called Irony

davemccoull wrote:
" I find it strange an American truck has so many metric parts i.e. bearings and oilseals"

Somewhere recently I read an explanation of this American metric bearing anomaly, where an entire design will specify measurements in units of inches except for the bearings which are in metric units. At some time in history, Germany was the world leader in bearing manufacturing. German bearings, standarized in metric units by the Germans, were built into American-made equipment, thus introducting a metric standard into the U.S. Once that metric bearing standard became established in the U.S. it stuck, though we remain otherwise predominantly non-metric and are equally as capable now as the Germans at bearing manufacture.

In followup to my previous post re early German dominance in ball-bearing manufacture: Apparently it owes to Friedrich Fischer's invention of the ball grinder in 1887. Here is a link about FF and his grinder:
http://www.fag.com/content/en/company/history/from-1883-to-1914/history-1946-1960.jsp

To rdixiemiller and longhunter7
I just can,t believe all the help and info on this site!
When i am in neutral with engine running, you can here the gearbox rumbling, when the clutch is shoved in all is quiet, when running on road gearbox whines like a "banshee" (i want to hear turbo not transmission), whine increases with engine speed.
Between us i,m sure the yanks and limeys will get to the root of the problem, interesting piece about metrication!
Thanks again everybody and also to Gerhard(a walking encyclopedia on M35,s)
Dave.