5 replies to this topic

[Stevedavies]

Amin the process of restoring my mk1 mini, 1960, 848cc saloon. Car has been left untouched for 50 years and I believe all mechanicals are original

I am in the process of changing idler gear needle rollers bearings.I ordered 2 *13H7848 bearings.

I measured idler shaft and both ends are approx 19mm.
Outside diameter of 13h7848 are approx 27mm. I offered up the bearing in the gearbox casing and it looks like it will fit. Yet when I look at the flywheel casing the hole measures 25mm and doesn’t look like it will fit.
Have I bought wrong bearings?.

[nicklouse]

There are 2 sizes of bearing used. And they are the same for the transfer case and the gearbox.

you have bought the correct ones for the early type boxes.

[Spider]

The early bearings, like those that would have been in your car are 1" OD. In 1968, they did increase these to 1-1/16".

 

 

While that does refer to the All Synchromesh Gearbox, there was a gradual introduction on the last of the 3 Synchro Boxes.

 

Be aware there bearings come in 2 types. Caged and Full Compliment. They are dimensionally the same as the Front Upper Suspension Arm, these are high load and low speed, so they use a full compliment type. The Gearbox is high speed and low(er) load and used a caged type.

[ac427]

Be aware there bearings come in 2 types. Caged and Full Compliment. They are dimensionally the same as the Front Upper Suspension Arm, these are high load and low speed, so they use a full compliment type. The Gearbox is high speed and low(er) load and used a caged type.

 

Hi Spider, What is the physical difference between a full compliment bearing and a caged bearing?

Edited by ac427, 23 May 2023 - 09:10 PM.

[nicklouse]

There are spaces between the rollers in a caged bearing. As the cage holds them in place. Full comp has no cage but is filled with rollers so they are evenly spaced/supported.

[Spider]

Hi Spider, What is the physical difference between a full compliment bearing and a caged bearing?

 

 

The one on the left is a Caged Type

On the right, is a Full Compliment