Needle bearings

[RayT]

My morris has some badly pitted loose needle roller bearings in the gearbox . None of the bearing suppliers can supply the size. Could dowel pins be used instead, would they be hard enough?

[osiford]

Needle rollers are hardened, so it is unlikely that dowel pins will last very long. What is the size of needle you are looking for?

[RayT]

Dowel pins are hardened, but how hard in comparison I don't know. 

Sizes are 1/8 × 1 and 1/8 x 1 1/4 

[ruxy]

2 hours ago, RayT said:

My morris has some badly pitted loose needle roller bearings in the gearbox . None of the bearing suppliers can supply the size. Could dowel pins be used instead, would they be hard enough?

Bearing suppliers you have contated - I take-it they can't supply spare needle rollers ?    There must be needle bearings (complete) with correct dia. rollers , then you just scrap new bearings and reclaim the rollers - plenty of local toolrooms could the use a cutter-grinder to chop these rollers to the desired length.  Obtain a  INA Bearings technical catalogue to trawl through.  Incidently - many years ago I worked on Brewne & Sharpe single spindle autos, these had split needle bearings for headstock spindles , this allowed quite a rapid change over from conventional lathe spindle to eccentric turning (the lathe did a quick-reverse that threw the spindle into eccentric. The only case I have known of this precision type bearing being spit construction.

[Richard Farrant]

4 hours ago, RayT said:

Dowel pins are hardened, but how hard in comparison I don't know. 

Sizes are 1/8 × 1 and 1/8 x 1 1/4 

Hi Ray,

Not sure what model Morris you have, but going through the C8 parts list I think I have identified your bearings and have manufacturers part numbers.

You say 1/8" x 1 1/4", that would be Morris part no. C868 and a quantity of 59 rollers for the 2nd speed constant mesh gear. Manufacturers part numbers:

Ransome & Marles part no. N.125 x 1 1/4" 

Hoffman part no. B.2785

Skefko part no. 125 x 1 1/4

The 1/8" x 1" rollers  are Morris part no. C.681 for the stem gear on gearbox mainshaft, a qty of 28:

(the diameter is actually 0.1248")

Ransome & Marles part no. N.1248 x 1

Hoffman part no. B.4767

hope this is is help to you.

regards, Richard

 

[RayT]

Thanks Richard, brilliant bit of info. I didn't realise there is a parts manual about, very handy information.

[Richard Farrant]

Hi Ray,

The parts list gave the Morris part numbers and an army stock number, I cross referenced the army number in the LV6MT7 Vocab - Bearings and the makers part numbers came up. I am sure if you look on a search engine you will find bearing stockists who can help. I have done this successfully in the past.

[Grego]

I've used the correct size gauge pins cut down to the proper length to replace 3 of the 880 loose needle bearings in my Ferret. So far no issues.