exhaust manifold 3.6

[Tuffareo]

I have just been advised that the rear exhaust manifold needs replacing, however there are 2 listed parts - one classified as air injection and bizarrely named except air injection. Is anybody able to advise how to tell the difference?

[ptjs1]

Tuffareo,

I'm not sure where you reside (if you update your profile with location etc, it's helpful for others to give more informed replies), so I'm not sure whether you have a UK or overseas car.

However, air injection is an engine / exhaust setup that is applicable in a lot of overseas territories where emissions limits are more stringent. In simple terms, air is introduced into the exhaust flow via a pipe into a threaded boss in the manifold.

It's not fitted on any 3,6 UK cars, as far as I know. You can fit an air injection manifold on a UK car, you just have to find a suitable bolt or similar to plug the air injection inlet.

Hope that helps.

Paul

[poprivet]

To add, on UK cars at least, the manifolds from the XJ40 (xj6) are exactly the same, might make locating one easier.

If it has developed a crack it can be bronze welded but will need re-surfacing as well. Also if it is cracked, clean the in-tank petrol filter, main fuel filter and generally make sure the fuel supply and return components are not restricted as its usually a weak mixture that results in the manifolds cracking.

I would also bet that if one is cracked, they both will be!

[Tuffareo]

ptjs & Pop Rivet,

Many thanks for your replies and have updated my profile and added a bit about me as Paul suggested. The car is a UK variant and original.

I have located replacement manifolds and will check all relevant sectioned mentioned by Pop Rivet to make sure the damage is not repeated.

Thanks again.