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[mathewst]

LPG installer told me that I have a slightly leaking exhaust manifold gasket.
How easy are these things to change?
Does the front exhaust need to be removed, or anything else also?
Also could a partially blocked cat cause the gasket to leak?

[tunnie]

two ways, both straight forward enough, from memory, remove the heat shield, then just remove all bolts for the exhaust manifold. You could take out the bolt for the exhaust support bracket before the second cat.

Might be worth supporting exhaust with something, as you don't want to drop too far. Just enough to get the gasket out.

Alternatively, remove bolts for the exhaust down pipe (which is prob better way)

[mathewst]

Ok thanks Tunnie

[cem_devecioglu]

mathewst , which side ?

if its passenger side in (your country) fairly straight.. but be careful about the coolant pipe that goes behind the engine , it can leak if you dont change the gasket and seal properly..

if its driver side (your country) I cant say the same.. fiddly job , very tight area, you need to take ac compressor out to gain some space and need to move ecu cables , battery etc..  it took nearly 2 days for 2 of us (and you will say hi to famous bolt if you have to do this side :-/)

ps : can post some pictures when I arrive at home..

[Abiton]

LPG installer told me that I have a slightly leaking exhaust manifold gasket.How easy are these things to change?
Does the front exhaust need to be removed, or anything else also?
Also could a partially blocked cat cause the gasket to leak?

Did they remove the heatshield and have a look?

The reason I ask is that one possible cause for the gasket leaking is that one (or more) of the studs has broken, thus losing the squish of the gasket in that area.  If a stud is broken, the job becomes much more difficult, especially if it has broken off flush.

Fingers crossed for you that this hasn't happened.

I'd recommend aiming to unbolt the manifold from the downpipe so that you can completely remove it from the car.  This will make it much easier to clean up both mating faces, and check the manifold for flatness and cracks.

[mathewst]

Hmm you guys really scared me now .
Will have to ask the lpg guy for more info (have the meeting with him on friday about some documents he has to give me to finalize the install)

[tunnie]

exhaust manifold should not have been touched, its the injection manifold that should have been removed for injector drilling and tapping.

If they did remove the exhaust manifold, I am worried too 

[cem_devecioglu]

LPG installer told me that I have a slightly leaking exhaust manifold gasket.How easy are these things to change?
Does the front exhaust need to be removed, or anything else also?
Also could a partially blocked cat cause the gasket to leak?

Did they remove the heatshield and have a look?

The reason I ask is that one possible cause for the gasket leaking is that one (or more) of the studs has broken, thus losing the squish of the gasket in that area.  If a stud is broken, the job becomes much more difficult, especially if it has broken off flush.

Fingers crossed for you that this hasn't happened.

I'd recommend aiming to unbolt the manifold from the downpipe so that you can completely remove it from the car.  This will make it much easier to clean up both mating faces, and check the manifold for flatness and cracks.

 

[mathewst]

They didn't remove it, just the guy informed me that he can hear it leaking slightly and that I will need to change it sooner or later