Omega Owners Forum

Chat Area => General Discussion Area => Topic started by: JamesV6CDX on 28 October 2007, 01:24:15

Title: Rebuilding a manual gearbox
Post by: JamesV6CDX on 28 October 2007, 01:24:15
Hi Guys,

I am considering the possibility of obtaining a second hand manual gearbox, and totally overhauling / reconditioning it, to the extent that it's as good as new.

This is not something I've ever done before, so I'm not sure what tools would be required, what parts I would need, or what the availability and cost of them would be, or if it would be within my capabilities.

Expert advice please :y
Title: Re: Rebuilding a manual gearbox
Post by: miggy on 28 October 2007, 03:05:46
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Hi Guys,

I am considering the possibility of obtaining a second hand manual gearbox, and totally overhauling / reconditioning it, to the extent that it's as good as new.

This is not something I've ever done before, so I'm not sure what tools would be required, what parts I would need, or what the availability and cost of them would be, or if it would be within my capabilities.

Expert advice please :y

Hats off for trying

 :y :y :y
Title: Re: Rebuilding a manual gearbox
Post by: JamesV6CDX on 28 October 2007, 03:08:07
Boxes are common enough, there's not much to lose!
Title: Re: Rebuilding a manual gearbox
Post by: miggy on 28 October 2007, 03:10:05
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Boxes are common enough, there's not much to lose!


Only your sanity

 ;D ;D ;D
Title: Re: Rebuilding a manual gearbox
Post by: TheBoy on 28 October 2007, 09:44:01
And this replacement gearbox? You are planning on fitting on my tractor?

;)
Title: Re: Rebuilding a manual gearbox
Post by: Taxi_Driver on 28 October 2007, 09:50:42
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And this replacement gearbox? You are planning on fitting on my tractor?

;)

You want a manual tractor  :o :o
Title: Re: Rebuilding a manual gearbox
Post by: TheBoy on 28 October 2007, 10:36:57
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And this replacement gearbox? You are planning on fitting on my tractor?

;)

You want a manual tractor  :o :o
The auto simply doesn't suit it. I am constantly shouting at the bloody box for being so stupid...
Title: Re: Rebuilding a manual gearbox
Post by: tunnie on 28 October 2007, 10:44:36
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And this replacement gearbox? You are planning on fitting on my tractor?

;)

You want a manual tractor  :o :o
The auto simply doesn't suit it. I am constantly shouting at the bloody box for being so stupid...

Would you also need to change the prop shaft if converting to a manual?
Title: Re: Rebuilding a manual gearbox
Post by: TheBoy on 28 October 2007, 14:27:41
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And this replacement gearbox? You are planning on fitting on my tractor?

;)

You want a manual tractor  :o :o
The auto simply doesn't suit it. I am constantly shouting at the bloody box for being so stupid...

Would you also need to change the prop shaft if converting to a manual?
Not checked, but would imagine they are the same...
Title: Re: Rebuilding a manual gearbox
Post by: Taxi_Driver on 28 October 2007, 16:38:10
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And this replacement gearbox? You are planning on fitting on my tractor?

;)

You want a manual tractor  :o :o
The auto simply doesn't suit it. I am constantly shouting at the bloody box for being so stupid...

Ohhh......I dont like to ask if its got the latest version on the g/b ecu  ;) :P
Title: Re: Rebuilding a manual gearbox
Post by: VXL V6 on 28 October 2007, 16:47:30
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The auto simply doesn't suit it. I am constantly shouting at the bloody box for being so stupid...

Is it the four speed (4L30E)? Wonder what the five speed (5l40E) would be like in it?

Title: Re: Rebuilding a manual gearbox
Post by: smoothomega on 28 October 2007, 17:05:16
I have rebuilt several boxes over the years and although it can be done if you have common sense and a decent set of tools, and i know you have both James, it does depend on what you want at the end of the day. To buy all the bits, new bearings, washers, thrust rings etc etc it will cost you nearly as much as an exchange recon box with some guarantee, but, and here is the but they tend to only replace what needs replacing, if however you do the job yourself you will replace everything and know what is in the box, if this makes sense.
Title: Re: Rebuilding a manual gearbox
Post by: GastronomicKleptomaniac on 28 October 2007, 17:09:44
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The auto simply doesn't suit it. I am constantly shouting at the bloody box for being so stupid...

Is it the four speed (4L30E)? Wonder what the five speed (5l40E) would be like in it?


 I'm not up on my gearboxes... especially autos... which (if any) Omegas came with a five-speed auto?
Title: Re: Rebuilding a manual gearbox
Post by: VXL V6 on 28 October 2007, 17:18:45
Hardly any! apparently the very end of line Diesels did (It's listed in the manual with my car).

As the TD is really at it's best when 'on turbo' I wondered if the five speeder would suit the characteristics of the 2.5TD better? I believe that's the reason why VX fitted it to the 4 pot TD's at the end.
Title: Re: Rebuilding a manual gearbox
Post by: Paul M on 28 October 2007, 18:01:08
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Hi Guys,

I am considering the possibility of obtaining a second hand manual gearbox, and totally overhauling / reconditioning it, to the extent that it's as good as new.

This is not something I've ever done before, so I'm not sure what tools would be required, what parts I would need, or what the availability and cost of them would be, or if it would be within my capabilities.

Expert advice please :y

The question is, why do you want to? If it's for the engineering learning experience then fair enough, but otherwise I don't see the point. They rarely fail, and in the off chance that you're unlucky and it does fail then pick up a used one for peanuts -- due to lack of failures there's no demand for them on the used market meaning they're super cheap, and you'd be unlikely to have two fail unless you're running big power.

The only real failure point (wear and tear actually) is the clutch, and as you've replaced that you should be good for at least another 100K.
Title: Re: Rebuilding a manual gearbox
Post by: Omegatoy on 28 October 2007, 18:20:05
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And this replacement gearbox? You are planning on fitting on my tractor?

;)

You want a manual tractor  :o :o
The auto simply doesn't suit it. I am constantly shouting at the bloody box for being so stupid...

Would you also need to change the prop shaft if converting to a manual?
Not checked, but would imagine they are the same...

nope manua prop is longer, but its easy to just use the front of a manual prop as they are the same length from centrebearing back, the 2 halves just slide together on a masterspline system :y
Title: Re: Rebuilding a manual gearbox
Post by: TheBoy on 28 October 2007, 21:20:19
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And this replacement gearbox? You are planning on fitting on my tractor?

;)

You want a manual tractor  :o :o
The auto simply doesn't suit it. I am constantly shouting at the bloody box for being so stupid...

Ohhh......I dont like to ask if its got the latest version on the g/b ecu  ;) :P
First thing I did, better, but still not that good.
Title: Re: Rebuilding a manual gearbox
Post by: TheBoy on 28 October 2007, 21:21:02
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Hardly any! apparently the very end of line Diesels did (It's listed in the manual with my car).

As the TD is really at it's best when 'on turbo' I wondered if the five speeder would suit the characteristics of the 2.5TD better? I believe that's the reason why VX fitted it to the 4 pot TD's at the end.
None did.  The last of the diesels (all 2.2DTi) were manual only.
Title: Re: Rebuilding a manual gearbox
Post by: Martin_1962 on 28 October 2007, 22:27:10
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Hardly any! apparently the very end of line Diesels did (It's listed in the manual with my car).

As the TD is really at it's best when 'on turbo' I wondered if the five speeder would suit the characteristics of the 2.5TD better? I believe that's the reason why VX fitted it to the 4 pot TD's at the end.
None did.  The last of the diesels (all 2.2DTi) were manual only.


The 24V S6 2.5 Diesel fitted to late German cars
Title: Re: Rebuilding a manual gearbox
Post by: VXL V6 on 28 October 2007, 22:42:10
It must have been seriously considered though to be included in the manual? (P135 Edition October 2002) Or was it purely non UK spec cars?

Also Han's V6 had 5 speed box (admitedly not a UK spec car and also Petrol)
(http://i202.photobucket.com/albums/aa163/vxl_v6/hpim7100ly3.jpg)