Remove gearbox with manifolds in situ?
Remove gearbox with manifolds in situ?
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Discussion

sk7ine man

Original Poster:

604 posts

221 months

Thursday 10th December 2009
quotequote all
Just in the process of doing my clutch change and noticed the gearbox weeping so ideally id like to remove it and refresh the seals etc.

The TVR service manuals seem to suggest that the box can be removed with the manifolds still attached by rotating the box upside down and then pulling them up and over the manifolds into a vertical position. Anyone tried or done this and is it possible? Id rather not have the ballache of having to remove the manifolds.

Extra 300 Driver

5,282 posts

276 months

Thursday 10th December 2009
quotequote all
Yep. I did it twice. Not a problem but it is tight.

sk7ine man

Original Poster:

604 posts

221 months

Thursday 10th December 2009
quotequote all
Extra 300 Driver said:
Yep. I did it twice. Not a problem but it is tight.
Super. Did you rotate the box upside? How did you do it?

sk7ine man

Original Poster:

604 posts

221 months

Thursday 10th December 2009
quotequote all
Oh, the manual also shows that you put a bar in the end of each manifold and gently pry them apart to allow the box past but wouldnt that crack or fracture them?

Mike Hawthorn

87 posts

259 months

Friday 11th December 2009
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I've done this job and as said before it's tight. You do have to roll the gearbox over and it is a bit limited with space. I did it with the car on 4 axle stands and used some large wooden wedges to keep the exhaust clear. Putting it back was a little more difficult because you have to hold the full weight of the gearbox and slide it into the bell housing. I made up a rope strop at the rear to help take the weight. I did it alone but an extra set of hands would have been helpful.

Good luck

Mike

sk7ine man

Original Poster:

604 posts

221 months

Friday 11th December 2009
quotequote all
Mike Hawthorn said:
I've done this job and as said before it's tight. You do have to roll the gearbox over and it is a bit limited with space. I did it with the car on 4 axle stands and used some large wooden wedges to keep the exhaust clear. Putting it back was a little more difficult because you have to hold the full weight of the gearbox and slide it into the bell housing. I made up a rope strop at the rear to help take the weight. I did it alone but an extra set of hands would have been helpful.

Good luck

Mike
Mike, im a bit concerned about cracking the exhausts when pulling them apart, any advice?

Mike Hawthorn

87 posts

259 months

Saturday 12th December 2009
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Hi mate all I can say is I pulled them apart enough to get the box out. I learnt long ago always to expect the unexpected when working on the Cerb. I guess given the known cracking problems with the Cerb exhausts manifolds it may depend on the condition of your system. However the length of the pipe at the point where clearance is required does allow for some flex. given the extra work and risk of other damage in removing them I think the risk is well worth it.

Mike

julian64

14,325 posts

284 months

Sunday 13th December 2009
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nothing to stop you loosening the manifold bolts if you are worried. I prised mine apart with no obvious problems

sk7ine man

Original Poster:

604 posts

221 months

Monday 14th December 2009
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Thanks for the help guys. Fron reading Mad Marks guide, didnt realise how much of a b@st*rd job pulling the box of was going to on the floor with just a trolley jack and no extra hands. An hour later of swearing cursing and many expletives its off and i have absolutely no idea how im gonna put the bleedin thing back in biggrin


sk7ine man

Original Poster:

604 posts

221 months

Wednesday 16th December 2009
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Right clutch is out. I noticed a pool of oil under the OSF outrigger overnight which seems to be reddish fluid (power steering?). Looking around near the car its dripped down to the sump from the pipe running to the power steering pump which i think has started when i was jacking the engine up/down. It seems to have stopped though, any ideas?

350Matt

3,902 posts

309 months

Wednesday 16th December 2009
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I'd remove the RH manifold beofer you try putting the box back in as its a d@mn sight easier with it off.

If you undo the engine mountings at the front you can raise the engine up enough to make it less onerous and you'll make this time up when you're trying to juggle the box back into place.

I'd also recommend replacing the clutch hydraulic seals while you're there as they're only O-rings and the standard items are Nitrile which doesn't last, replace with viton rubber and they'll last.

sk7ine man

Original Poster:

604 posts

221 months

Wednesday 16th December 2009
quotequote all

Thanks for the advice Matt. Where can I get these special vitron seals from?

Are there any probs with exhaust mani bolts snapping? Just don't want to create more work!



Edited by sk7ine man on Wednesday 16th December 18:09

350Matt

3,902 posts

309 months

Wednesday 16th December 2009
quotequote all
Hi

You don't want Nitrile you want Viton.

http://www.tvrspareparts.com/part/51/clutch-slave-...

Also the manifold bolts should come out OK but you'll need some decent silicone sealant to reseal the manifolds to the head and use some copaslip on the bolts