What is the best way to refit my new Idler Gear bearings into the Case and Housing?

Any tips or tricks that can be passed on before I make a mess of this.....
Any specific depths etc I need to be aware of.


And also some help on refitting the 1st Motion Outrigger Bearing back onto the input shaft (shaft resting for photo), plus the associated Outer Bearing Race back into the above Transfer Housing?


Cheers, thanks.

Best tip is Don't try to hit them in with a drift and a hammer.
Make up a couple of mandrels to suit each bearing and carefully push them into the housings with a very light arbour press by hand. Use a little oil too. Make sure they are lined up accurately and square before applying any pressure, avoid using a hydraulic press they take all the "Feel" out of it....
Refit circlip with its rounded edges against the bearing.
Dave

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Thanks Dave
I don't personally have the required Lathe to make some mandrels or even an Arbour Press to press them in. Would be good though

What I was more hoping for was some simple 'Backyard Mechanic' tips to install both Idler Bearings and the Outrigger Bearing.

What I found Googling the last couple of days to install the Idlers is to possibly.... (And by all means I do not endorse these below until tried or proven otherwise by someone here)
* Slightly heat alloy housing & box to expand (Oven, Blow Torch? 10min?)
* Freeze bearings for a few hours to contract
* Oil for lube?
* Locktite to stop wandering?
* Transfer - Rubber mallet with a chock of wood under transfer for support
* Case - Drag it back in just like taking it out?
* I still don't know what depth for either bearings!

Can someone put truth to the rumour if these are workable?


As for the 1st Motion Outrigger have not found much info besides,
* Slightly heat Transfer alloy to expand (Oven, Blow Torch?)
* Freeze race for a few hours to contract
* Race - Tap in as far as possible, use old race to tap home till stop? or till circlip fits?
* Bearing - Still not sure how to press on the 1st Motion Bearing?

Any help from those in the know would be super helpful at this stage.

Thanks all for looking

Im no expert, but Im sure someone will correct me if Im wrong so:

Drive both the bearings all the way home, these aren't critical. The idler shims will space everything out.
In fact I believe the early idlers only ran in half the bearing anyway.

Dont bother trying to heat or cool, At best you might get a thou or 2. i.e. bugger all. at worst you damage the case.

The outrigger is hardened so you could, very carefully, use a drift or near size socket to drive it home. Go very slowly and make sure its square. use your smallest hammer.

The idler is tricky as you risk bending the cage. Ive had luck with a bit of plate across 2 bolts or studs through the housing and carefully tighten it home. I made up a mandrel but anything of the right diamater should work.

Ok, I understand that you don't have the equipment to do what I suggest.
Of course there are other options, the important thing is to know what is required when fitting these bearings.
You have to fit them in a way as to,
1 Not damage the bearings or housing as you fit them.
2 Ensure they are square to the bore as they are going in.
3 Ensure they are fully home in the housing.

* Slightly heat alloy housing & box to expand (Oven, Blow Torch? 10min?)

Aluminium has a huge coefficient of expansion, this method will work. Don't heat with a flame, heat in the oven keeping heat no higher than 180 degrees. At this temp the bearings will literally fall into the housing.
Bearing must be kept square as it goes in or will jam in the bore, case will cool and you will be in trouble.

* Freeze bearings for a few hours to contract

Freezing a bearing in a conventional freezer is a fruitless exercise.
To contract a bearing by freezing it must be put in liquid Nitrogen.

* Oil for lube?

Use Oil to aid installation when fitting cold for sure.

* Locktite to stop wandering?

If locktite is required in this application the housing is not serviceable.

* Transfer - Rubber mallet with a chock of wood under transfer for support

Softer than Bearing materials are always handy, Depending on How they are Used.

* Case - Drag it back in just like taking it out?

Yes, I normally Draw the bearing into the Gearbox case with a Longish piece of threaded rod with a couple of flanges and nuts.

* I still don't know what depth for either bearings!

Idler bearing in clutch housing needs to be fitted below thrust face, I normally fit it level with the
chamfer in the bore. there is no support for the bearing above the chamfer line.

Outrigger bearing needs to be as far in as it can go otherwise Circlip will not fit.


Can someone put truth to the rumour if these are workable?



* Bearing - Still not sure how to press on the 1st Motion Bearing?

This bearing is not very tight on the shaft.
Only push on or tap on the centre section of the bearing.
Use a short length of suitable size steel tube, Exhaust tube perhaps, over the end first motion shaft
to bump the bearing into place.

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Great tips, gives me greater confidence reading this stuff.
Probably being a bit over cautious, but anyway!

Thanks,
your image didn't work for me. Any chance of reposting this?
Thanks for your reply, great advice and it actually all makes perfect sense.
Cant wait to get back into the shed this weekend!

Great resource this...
Thanks all for their help

Cheers

FYI, for many years I have been putting these bearings into the freezer for a few hours prior to fitting. It does make a difference. I also do the same with the collar in the 4 speed synchro gearbox.
It some times makes the difference between an easy fit or using a BFH

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1969 Cooper "S"
1967 Mini Deluxe
1973 Clubman Van (the fleet spare)
1978 ex 1275 LS ("Wizard" Eaton Supercharged)
2015 HSV GenF GTS(occasional drive & tow car)
2019 MINI F55 Cooper S

Using a suitable sized socket (half inch drive or 3/8 drive) & hammer , you will be able to tap against the outrigger`s inner race nicely & it will slide on neat & tidy onto the first motion shaft,,, tap until it`s all the way home, fit c-clip & Bob`s your aunty.

same with the outriggers Outer race into the primary case,,, keeping things true as they slide in isn`t that difficult, a good eye & a good feel & you`ll be fine... again fit the circlip & away you go.

the idler bearings can be pushed in with methods as above but can also be done using an old idler gear as a drift to get it in & flush ,,, & then use another suitable sized socket to belt it in that bit more,,, i`m not a fan of this method but it works if you take some care & don`t use a socket too small... too small a socket & you can damage/distort the bearing`s outer case.

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No offence intended here but--> anyone writing a book about minis 30 years ago may not have experienced such worn or stuffed-with components as we are finding these days.

You should put your heart & soul into everything you do.

Thanks Matt

For just a moment I thought I was the only person to fit bearings with the appropriate sockets and a measured use of a hammer.

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Dalmeny

Thanks michaelb, I think your right any little bit will always help. Cheers.

Yeah thanks Matt, I haven't had a good chance to attack this yet, so with your tips and all the other advice I think I should have no excuses in getting it done right!
Good on ya