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Author Topic: Autobox exchange AR25 to AR35  (Read 1917 times)

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Shackeng

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Autobox exchange AR25 to AR35
« on: 06 March 2011, 11:23:05 »

Is there a 'How to' for the above? I thought I'd seen one but now can't. :-/
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tunnie

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Re: Autobox exchange AR25 to AR35
« Reply #1 on: 06 March 2011, 11:31:28 »

don't think we have one, its just a case of unplugging it and putting new one in. AR25/35 are identical in terms of fitting  :y
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JamesV6CDX

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Re: Autobox exchange AR25 to AR35
« Reply #2 on: 06 March 2011, 11:31:49 »

I think sassanch's thrust washer pics will explain a lot

As per your other thread, I've done a few of these, I am more than happy to come down and help for the day  :y   

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Shackeng

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Re: Autobox exchange AR25 to AR35
« Reply #3 on: 06 March 2011, 11:38:33 »

Quote
I think sassanch's thrust washer pics will explain a lot

As per your other thread, I've done a few of these, I am more than happy to come down and help for the day  :y   And thanks very much for the offer, I'm about 12 miles SE of Swindon. :y



Yes, got that bookmarked already. I know there is an issue with the torque converter coming off, with potential damage caused if done incorrectly, either with or without the box, and I can't remember which. :y

Thanks very much for your kind offer James. It will probably be after Easter as I have a building project on at present. :y
« Last Edit: 06 March 2011, 11:46:11 by ci643215 »
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JamesV6CDX

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Re: Autobox exchange AR25 to AR35
« Reply #4 on: 06 March 2011, 11:39:58 »

You need to unbolt the TC, and remove it WITH the gearbox :y

Leaving it on the engine can damage the seal on the gearbox shaft...
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Andy H

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Re: Autobox exchange AR25 to AR35
« Reply #5 on: 06 March 2011, 11:45:20 »

Quote
Is there a 'How to' for the above? I thought I'd seen one but now can't. :-/
I think last time anyone asked Jimbob said he had taken it down to give it a polish and it would be back soon  ::)
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Shackeng

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Re: Autobox exchange AR25 to AR35
« Reply #6 on: 06 March 2011, 11:47:05 »

Quote
You need to unbolt the TC, and remove it WITH the gearbox :y

Leaving it on the engine can damage the seal on the gearbox shaft...

That's it, I knew I'd read it somewhere. :y :y :y
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Shackeng

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Re: Autobox exchange AR25 to AR35
« Reply #7 on: 06 March 2011, 11:48:19 »

Quote
Quote
Is there a 'How to' for the above? I thought I'd seen one but now can't. :-/
I think last time anyone asked Jimbob said he had taken it down to give it a polish and it would be back soon  ::)

Perhaps he's polishing something else, and lost track of time? ::) ::) ::) 8-) 8-) 8-) ;D ;D ;D
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JamesV6CDX

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Re: Autobox exchange AR25 to AR35
« Reply #8 on: 06 March 2011, 11:48:49 »

Quote
Quote
You need to unbolt the TC, and remove it WITH the gearbox :y

Leaving it on the engine can damage the seal on the gearbox shaft...

That's it, I knew I'd read it somewhere. :y :y :y

Upon refitting... insert the TC into the bellhousing, aligned correctly and as far back as it can go.. (you'll hear it make a scoring noise when it's back far enough)

It can be deceptive - you can think it's in there far enough, when actually it's not - which can cause probs on refitting
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Andy H

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Re: Autobox exchange AR25 to AR35
« Reply #9 on: 06 March 2011, 14:43:36 »

Quote
Quote
Quote
Is there a 'How to' for the above? I thought I'd seen one but now can't. :-/
I think last time anyone asked Jimbob said he had taken it down to give it a polish and it would be back soon  ::)

Perhaps he's polishing something else, and lost track of time? ::) ::) ::) 8-) 8-) 8-) ;D ;D ;D
This thread http://www.omegaowners.com/forum/YaBB.pl?num=1279736694/7 mentions Ronald McBurgers guide.
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Andy H

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Re: Autobox exchange AR25 to AR35
« Reply #10 on: 06 March 2011, 14:58:32 »

My recollection of the key points is
1. V6 (and I4) petrol engines use GM small block bolt pattern for the bell housing. BMW diseasal uses BMW bolt pattern.
2. Petrol and diesel engines have different torque characteristics therefore the torque converter is chosen to suit the engine.
3. AR35 is stronger than AR25 but has same gear ratios.
4. If the new gearbox came from a petrol engine then the bellhousing and torque converter need to be transfered from the old box to the new gearbox before fitting.
5. The gearbox must be stood on end before the bellhousing is removed or else the oil pump, and very important little things, will jump out and forget where they came from ::)
6. There is a plastic thrust washer in there somewhere that is easy to change while the bellhousing is off.........
7. Assembly is reverse of dissembly BUT as said above fit torque converter to gearbox before fitting to engine.
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Shackeng

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Re: Autobox exchange AR25 to AR35
« Reply #11 on: 06 March 2011, 18:22:50 »

Quote
Quote
Quote
Quote
Is there a 'How to' for the above? I thought I'd seen one but now can't. :-/
I think last time anyone asked Jimbob said he had taken it down to give it a polish and it would be back soon  ::)

Perhaps he's polishing something else, and lost track of time? ::) ::) ::) 8-) 8-) 8-) ;D ;D ;D
This thread http://www.omegaowners.com/forum/YaBB.pl?num=1279736694/7 mentions Ronald McBurgers guide.


Thanks Andy, that's the one I've seen, but now cant find. :-/
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TheBoy

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Re: Autobox exchange AR25 to AR35
« Reply #12 on: 06 March 2011, 19:05:30 »

As JV6 says, TC must come off and go on with the gearbox, and MUST NOT be done using the McBurger method.

TD only has 3 bolts holding TC to flyplate
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TheBoy

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Re: Autobox exchange AR25 to AR35
« Reply #13 on: 06 March 2011, 19:06:20 »

And if you're doing one, and feel the need to take some pics, and write some text for a guide ::) :y
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Omegatoy

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Re: Autobox exchange AR25 to AR35
« Reply #14 on: 06 March 2011, 19:26:27 »

Quote
My recollection of the key points is
1. V6 (and I4) petrol engines use GM small block bolt pattern for the bell housing. BMW diseasal uses BMW bolt pattern.
2. Petrol and diesel engines have different torque characteristics therefore the torque converter is chosen to suit the engine.
3. AR35 is stronger than AR25 but has same gear ratios.
4. If the new gearbox came from a petrol engine then the bellhousing and torque converter need to be transfered from the old box to the new gearbox before fitting.
5. The gearbox must be stood on end before the bellhousing is removed or else the oil pump, and very important little things, will jump out and forget where they came from ::)
6. There is a plastic thrust washer in there somewhere that is easy to change while the bellhousing is off.........
7. Assembly is reverse of dissembly BUT as said above fit torque converter to gearbox before fitting to engine.


CORRECT!!! :y
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