Exhaust manifold cracked

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Exhaust manifold cracked

Postby dapinky » Mon 05.02.2007, 20:19

Okay, it's like Ronseal, just like it says on the title!

Now I've got the head into the garage, I've done a bit of the strip down and found a couple of cracks in the exhaust manifold. None of them are on the mounting faces so the question is this:-

Is it a known fault, or is it a new one?

Do I live with it, get it 'metal stitched' or scrap it for a new (or good second hand) one?

Anyone got a good one spare?

As it is easy to replace later, should i just try it as it is and then look for another?

All advice gratefully received (even if i end up ignoring it!).

On the plus side, everything has come apart easily and the head is only very slightly warped. I've got to sort it out tomorrow with a machine shop to get it measured acurately and skimmed (if necessary).
Dave

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...oh, and a 2006 Freelander destined for the jungles of The Gambia - 4500 miles across roads, desert and tracks - what could possibly go wrong?
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Postby Ashaman » Sat 10.02.2007, 20:28

Yeah, I had the same problem. They weren't on mounting surfaces, and didn't really look like the were leaking (much?) but I was worried about them getting worse.

So, I picked up another, it was cracked also - talked to the Isuzu dealer, they said they could order a new one (it was expensive) but it would probaly just crack also. According to them it is a common thing.

They advised me not to worry about it; so I didn't.
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Postby dapinky » Sun 11.02.2007, 11:40

Ashaman,

Thanks for that - it was just the sort of reply i was hoping for - anything that says i don't need to spend more money has to be good!

(SJ's want about £160 + VAT for one)
Dave

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...oh, and a 2006 Freelander destined for the jungles of The Gambia - 4500 miles across roads, desert and tracks - what could possibly go wrong?
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Postby isuzuimark » Sun 11.02.2007, 16:44

I have never seen a turbo manifold with out that nasty crack on the back. You could weld it up but it will most likely crack again since its cast iron and cast doesnt like to be welded. I welded mine up, but i have spares. If you weld it you should heat it up to 350-500deg F and weld then put it in your preheated oven and let it cool down slowly.

Any leak before the o2 sensor is going to cause yur car to run rich. And on a turbo car it will also boost slower.
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Postby Doc Fizzix » Sun 11.02.2007, 16:59

isuzuimark wrote:I have never seen a turbo manifold with out that nasty crack on the back. You could weld it up but it will most likely crack again since its cast iron and cast doesnt like to be welded. I welded mine up, but i have spares. If you weld it you should heat it up to 350-500deg F and weld then put it in your preheated oven and let it cool down slowly.

Any leak before the o2 sensor is going to cause yur car to run rich. And on a turbo car it will also boost slower.


Welded mine up (well my tech did it) Make sure the metal has been sand-blasted and then pre-heat in an oven. Then he used a nickle rod since the manifold had a high nickle content and the welds came out great!
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Postby ppete100 » Wed 07.03.2007, 19:52

> http://www.grouplotus.com/media/car/doc ... 20Sale.pdf
bought one last month.. £5.. bargain!!
good luck :-)
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Postby dapinky » Wed 07.03.2007, 19:59

ppete100 wrote:> http://www.grouplotus.com/media/car/doc ... 20Sale.pdf
bought one last month.. £5.. bargain!!
good luck :-)


That would have been quite helpful if I'd needed one for an N/A!
Dave

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...oh, and a 2006 Freelander destined for the jungles of The Gambia - 4500 miles across roads, desert and tracks - what could possibly go wrong?
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Postby GeoffSmith » Wed 07.03.2007, 20:10

ppete100 wrote:> http://www.grouplotus.com/media/car/doc ... 20Sale.pdf
bought one last month.. £5.. bargain!!
good luck :-)

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