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Old 19-04-13, 10:30 PM   #1
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Default Exhaust Leak around Turbo

Hi all,

I thought the exhaust clamp was the cause of an exhaust leak next to the turbo heading to the DPF on my 407 1.6HDI so got a new clamp installed. Unfortunately the leak is still there with a load of soot between the heat sheild and clamp area and also on the turbo itself. I see a load of sooty exhaust come up from the opening of the heatshield at the front of the engine to the point where it is entering the cabin when fresh air vent is on. The guy that fitted the clamp seems to think that the turbo is at fault.

What I would like to know is whether it's likely for a turbo to go by leaking exhaust fumes between it's constituent parts, or is it more to be simply a seal issue on the turbo? The turbo itself works fine with very little lag on acceleration. The car has done 167K miles.

Thanks.
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Old 19-04-13, 10:35 PM   #2
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Its leaking because whoever removed the particle filter previous didn't it correctly. The particle filter lower mounting nuts are to be loosened off to tighten the top clamp up correctly. Now whoever fitted the new clamp fitted it incorectly again because of laziness.

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Old 19-04-13, 10:41 PM   #3
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Hi David, thanks for the reply.

Quote:
Originally Posted by davidireland View Post
Its leaking because whoever removed the particle filter previous didn't it correctly. The particle filter lower mounting nuts are to be loosened off to tighten the top clamp up correctly.
The lower mounting bolt is attached to a large clamp that wraps around the DPF, is this the one you mean? It doesn't look like that was touched when fitting the small clamp up at the top (from turbo to DPF pipe).

I can see some white residue around the clamp that was fitted, is this like a mastic sealant that is fitted as a matter of course when a clamp is installed?

Thanks.
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Old 19-04-13, 10:45 PM   #4
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Nope the mounting bolts are at each side of the particle filter about half way up it. There are two 13mm nuts holding it to the block.

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Old 19-04-13, 10:48 PM   #5
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Quote:
Originally Posted by davidireland View Post
Nope the mounting bolts are at each side of the particle filter about half way up it. There are two 13mm nuts holding it to the block.
Oh OK, don't recall seeing them, will need to have another check. I need someone like you in the North West of England!

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Old 19-04-13, 10:51 PM   #6
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Sure you have come away with a few answers anyway. It'll work out fine loosening off the two nuts.

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Old 19-04-13, 11:07 PM   #7
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Quote:
Originally Posted by davidireland View Post
Sure you have come away with a few answers anyway. It'll work out fine loosening off the two nuts.
I sure have. Going to check that clamp again soon, after loosening those 2 13mm nuts halfway up the DPF. Just don't recall seeing them last time.. I have to get to the bottom of this. I guess it doesn't help with the EGR Valve not working either (according to planet).
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Old 20-04-13, 09:18 AM   #8
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What was the fault for the egr valve?

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Old 20-04-13, 10:03 AM   #9
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Is was something like 'EGR stuck open - actual value not same as reference value'.

Had a go at trying to remove the EGR valve yesterday down at the back of the engine. Ended up stripping the torx screw on the valve itself, light was fading so gave up for the day. Looks like I chose the wrong screw anyway but couldn't see the bolts that hold it to the engine it's that restricted. Will try again next week...


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Old 20-04-13, 01:17 PM   #10
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You'll remove it about five minutes with an 8mm ratchet spanner. There are two studs holding it to the head.
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