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Home > How To > Make a tool for efficiently removing the gearbox mainshaft bearings!

TurboDave16V
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SouthPark, Colorado

Well - The bearings weren't coming out of my gearbox so easilly today; So - I made a tool to do the job. Last one I made disappeared and I've been talking about making another for a long time....

So - firstly - you need a tool like this from machine mart:


It's called a slide hammer. You can make one VERY easilly however - a piece of 2ft long 1/2"diameter bar with a cap / sleeve welded onto one end. You then need a suitable 'lump' of metal to act as a mass. Use your imagination / initiative - but it obviously needs to 'slide' along the bar and not past the cap/sleeve you've welded on there already!
On the other end of the bar, weld a M12 bolt - thread outwards of course. Congrats - your Very own slide hammer!

Now - this is the adaptor you need to make:



It's a 1st motion (bottom drop gear) nut welded to a 2" length of 1" diameter thin-wall tube. At the other end, weld in a M12 nut (will fall nicely inside the tube). All done!




To use:

Well - a picture paints a thousand words!



Screw the adaptor onto the 1st motion shaft. Screw the slide hammer into the adaptor.

Now - to use:



Hold the outer end of the slide hammer. Hold the 'sliding element' with your other hand, and slide it towards the transmission, then whack it backwards. Stand in amazement as the whole 1st motion bearing and shaft comes out with ease.
If it doesn't come out, then remove the slide hammer and hit yourself over the head with it before removing the circlip holding the bearing into the casing.



Now - the mainshaft dounble roller also benefits from this tool because the thread is the same in the 1st motion and mainshaft:



You need caution here though, as you can only draw the bearing out around 4/5mm before the 1st gear contacts the centre web - so don't use a lot of force...
What you can do though, is push the whole mainshaft assy back into the gearbox whilst putting a suitable wedge / spacer between the bearing circlip and web - hence preventing the bearing sliding back in.

Now you'll have a gap of around 10mm between lip on the end of the mainshaft and inner race of the bearing. Drop something in there like a small piece of aluminium to take up the clearance.

Now pull the mainshaft back and operate the hammer again.

By now you'll have enough of the mainshaft bearing ciclip exposed to get some pry bars (or screwdrivers for non-engineers) on to fully withdraw the bearing.

Jobs a goodun!

Edited by TurboDave16V on 24th Sep, 2009.

On 17th Nov, 2014 Tom Fenton said:
Sorry to say My Herpes are no better


Ready to feel Ancient ??? This is 26 years old as of 2022 https://youtu.be/YQQokcoOzeY



TurboDave16V
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Member #: 17
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SouthPark, Colorado

oh - DON'T hold the slide hammer in the area which is going to get impacted by the hammer. Firslty, the bones in your hand / fingers have a significantly lower impact strength than regular mild steel.
Furthermore, the cushioning effect of skin, flesh, and collapsing bones and cartlidge will reduce the effectivness of the 'impact' needed to withdraw the bearing.

On 17th Nov, 2014 Tom Fenton said:
Sorry to say My Herpes are no better


Ready to feel Ancient ??? This is 26 years old as of 2022 https://youtu.be/YQQokcoOzeY



Vegard

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Oh oh... Perfect for me, as I've jut made some tools myself :)
Let me get that camera out!

On 13th Jul, 2012 Ben H said:
Mine gets in the way a bit, but only when it is up. If it is down it does not cause a problem.



Nic

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First mini turbo to get in the 12's & site perv

Herefordshire

nice, and itll save you £70 or something


andeh

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impressive, nice faq dave :cool:

I've seen the future and tbh its Pie


Vegard

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I pick holes in everything..

Chief ancient post excavator

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I don't know i f this tool is still available, but I bought it dirt cheap off Ebay:




Finally I had to make my own tool to remove the double roller bearing. This tool also was avaliable earlier. What you do is to knock the mainshaft towards the 1st motion shaft (after it has been removed with the other tool:) ) then fit this tool (when it's finished it'll ook like a C) between the double roller and 1st gear.
Thenjust knock the mainshaft towards the speedo housing side and hey presto... Finished :)

On 13th Jul, 2012 Ben H said:
Mine gets in the way a bit, but only when it is up. If it is down it does not cause a problem.



Vegard

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I might add. I also use the sliding hammer for removing idler bearings.


On 13th Jul, 2012 Ben H said:
Mine gets in the way a bit, but only when it is up. If it is down it does not cause a problem.



miniminor63

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The oversills police

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hhmm Veg, WE made that one tool not you*tongue*


TurboDave16V
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SouthPark, Colorado

On 25/04/2006 17:27:08 miniminor63 said:

hhmm Veg, WE made that one tool not you*tongue*



Ha ha ha!

Caught out!

On 17th Nov, 2014 Tom Fenton said:
Sorry to say My Herpes are no better


Ready to feel Ancient ??? This is 26 years old as of 2022 https://youtu.be/YQQokcoOzeY



Tom Fenton
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Looks like Vegard has been WRONG! again!

LOL!


On 29th Nov, 2016 madmk1 said:


On 28th Nov, 2016 Rob Gavin said:
I refuse to pay for anything else


Like fuel 😂😂


Vegard

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I pick holes in everything..

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Well, I was team leader. You were my slave. Of course I deserve all the credit! *tongue*

On 13th Jul, 2012 Ben H said:
Mine gets in the way a bit, but only when it is up. If it is down it does not cause a problem.



miniminor63

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The oversills police

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hmm, I dont remember who it was that made that hole in the middle oval and ruining the drillbit? you worked on that lathe, not me:) I just watched you:)


Vegard

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Exactly, you did nothing! :)

I even broke something in the process!

On 13th Jul, 2012 Ben H said:
Mine gets in the way a bit, but only when it is up. If it is down it does not cause a problem.



miniminor63

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The oversills police

Oslo, Norway

this doesnt make sense Veg, first I where your slave, and then I didnt do anything? may I question your creditability?*tongue*


Vegard

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I pick holes in everything..

Chief ancient post excavator

Norway

On 25/04/2006 17:27:08 miniminor63 said:

hhmm Veg, WE made that one tool not you*tongue*


On 26/04/2006 08:28:34 miniminor63 said:

hmm, I dont remember who it was that made that hole in the middle oval and ruining the drillbit? you worked on that lathe, not me:) I just watched you:)


My credibility? What's this nonsense then? Self contradiction in terms.

On 13th Jul, 2012 Ben H said:
Mine gets in the way a bit, but only when it is up. If it is down it does not cause a problem.



TurboDave16V
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SouthPark, Colorado

Vegard has minimal credibility. There is nothing therefore to question. LOL

On 17th Nov, 2014 Tom Fenton said:
Sorry to say My Herpes are no better


Ready to feel Ancient ??? This is 26 years old as of 2022 https://youtu.be/YQQokcoOzeY



Tom Fenton
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Fearless Tom Fenton, Avon Park 2007 & 2008 class D winner

&

TM legend.

Rotherham South Yorkshire

*laughing* *laughing* *laughing* *laughing* *laughing* *laughing* *laughing* *laughing*


On 29th Nov, 2016 madmk1 said:


On 28th Nov, 2016 Rob Gavin said:
I refuse to pay for anything else


Like fuel 😂😂


miniminor63

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The oversills police

Oslo, Norway

On 26/04/2006 08:28:34 miniminor63 said:

hmm, I dont remember who it was that made that hole in the middle oval and ruining the drillbit? you worked on that lathe, not me:) I just watched you:)



Oh, just read it carefully Veg:) Its reads THAT lathe, we used two, we both turned it to shape in the big lathe, and you TRIED drilling the hole in the other small lathe:)


Bat

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Hi,
Now steady on..... Refer the to the NO BITCHING post, please! *wink* *tongue* Thank you!

LOL! I'd love to see you two in a workshop, must be a giggle! Can you post up a video?
Cheers,
Gavin :)

PS Nice slider hammer contraption Dave! (Note to self.....Must remember keep it On Topic*wink* )

Edited by Bat on 1st May, 2006.

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TurboDave16V
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10979 Posts
Member #: 17
***16***

SouthPark, Colorado

On 01/05/2006 08:54:01 Bat said:

Refer the to the NO BITCHING post, please! *wink* *tongue* Thank you!


Bat; it's clear these two are nearly married - so i don't think it applies...

On 17th Nov, 2014 Tom Fenton said:
Sorry to say My Herpes are no better


Ready to feel Ancient ??? This is 26 years old as of 2022 https://youtu.be/YQQokcoOzeY



Vegard

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I pick holes in everything..

Chief ancient post excavator

Norway

I just lost out on these on Ebay. Goody I (or Andrè, we haven't decided yet) mad my own :)

http://cgi.ebay.co.uk/ws/eBayISAPI.dll?Vie...:MEDW:IT&ih=001

On 13th Jul, 2012 Ben H said:
Mine gets in the way a bit, but only when it is up. If it is down it does not cause a problem.



graemec

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Carnforth, Lancs

I have the 18G613 one which I would be happy loan out to TM members in a similar way to Dicanio's crank tap.

PM me and I will happily post the item out then return it with a cheque to cover my postage costs (agreed in advance).
I might ask new members to TM for a small deposit up front as these tools are difficult to come by now.

If of any use I also have:
18G572 Synchromesh Assembly Ring
18G617/2 which I think is the drift for replacing first motion shaft bearings in teh flywheel housing - unfortunately I don't have the other part of the tool for removing them!


Scruffy

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Seaford Rise, South Australia

Nice carpet Vegard!

On 5th Sep, 2011 Vegard said:
I stand corrected. You should know *wink*



Vegard

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I pick holes in everything..

Chief ancient post excavator

Norway




On 20th Mar, 2008 Scruffy said:
Nice carpet Vegard!


Better than the one I'll need for my skull if this trend continues.

On 13th Jul, 2012 Ben H said:
Mine gets in the way a bit, but only when it is up. If it is down it does not cause a problem.



miniminor63

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The oversills police

Oslo, Norway

ha ha! I guess you are not able to see it in the mirror yet though *tongue*

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