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Thread: warped exhaust manifold

  1. #1
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    Default warped exhaust manifold

    I posted previously with what seemed to be an turbo issue - squealing, etc.

    It turned out to be a leaking exhaust - snapped bolt. The local garage removed and refitted, only for the problem to come back almost straight away. having stripped the manifold off again, they saw that the manifold face was warped ~3mm

    has anyone seen this before? if so, what was the fix? the garage have sent it to get it skimmed and whilst better, the milling man couldn't do it as well as they would have liked due to all of the turbo mountings etc being attached.

    they are going to put it together again, although it may not definitely work.

    If anyone else has seen this, did you ultimately have to swap the unit? there is zero play in the turbo, so reluctant to swap for swaps sake.

    Paul

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    EGR valve blanked by any chance?

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    Genuine question. What's the problem?

    Are we trying to help this guy or what!?

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    Regular Member OPC's Avatar
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    Vehicle : Vectra-C

    Trim : SRi XP2 Nav

    Engine : 1.9 CDTi 150

    Year : 2008

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    Quote Originally Posted by diesel dog View Post
    Genuine question. What's the problem?

    Are we trying to help this guy or what!?
    Not trying to help your theories then? It is quite possible to have this problem. You'll be saying that a blanked EGR is the cause of back ache next!

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    No theory, just fact.

    Blanked EGR = exhaust gases not cooled at part when EGR valve should be open = Engine parts getting consistently hotter (and not just exhaust manifolds).

    That's an indisputable fact, not just a theory.

    Backs just fine, and I'll keep it that way by not bothering to fit 19" 'snowflakes'.

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    Quote Originally Posted by diesel dog View Post

    Blanked EGR = exhaust gases not cooled at part when EGR valve should be open = Engine parts getting consistently hotter (and not just exhaust manifolds).
    'part throttle' that should read. Which, incidentally, is most of the time during 'normal' driving.

    If there's one thing worse than soot, it's heat.

    By the way. The BMW diesel I picked up a while ago with 40 odd thou on the clock. It had a blanked EGR. The turbo was obviously shot, as were the exhaust valves (all of them!). Could have been anything though.

    Owner not happy, to say the least!

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    Regular Member OPC's Avatar
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    Vehicle : Vectra-C

    Trim : SRi XP2 Nav

    Engine : 1.9 CDTi 150

    Year : 2008

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    Surely if the egt was higher, due to higher combustion temps, the overall engine temp would be higher???

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    Regular Member Dan_BlackSRi's Avatar
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    Vehicle : Vectra SRi

    Trim : XP1

    Engine : 1.9 CDTi 150

    Year : 2007

    Mileage : 66000

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    Any mod that increases power with generate more heat, will those create enough heat to damage parts.... NO, I am not denying that blanking EGR's causes higher EGT's, but enough to cause any damage - definitely not.

    BMW diesels go through turbos like nobodies business at the best of times, its one of their main issues, usually caused by the turbo oil breather not being changed regularly, even BMW services miss this out, as its not the easiest thing to get to.

    As ever DD is uses these things to back up his "theories" as there is no direct evidence of the EGR being the cause.

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    Quote Originally Posted by OPC View Post
    Surely if the egt was higher, due to higher combustion temps, the overall engine temp would be higher???
    Cooling systems are great aren't they. Up to a point! But they do keep things on an even keel, even if it means that the fans cut in a bit more often.

    It's not the EGT's that are the problem (unless you have a turbo). It's the overall combustion temperature. Which (when you've squeezed the air in the cylinder by a factor of 19:1 and then ignited it with diesel fuel) are going to be considerable. Well above 1600 degrees C. EGR brings this down considerably, and it brings it down during most of your normal driving. EGR isn't just there for your health! (we never did have a big 'smog' problem) It helps the manufacturers to not have to over engineer things like they used to do.

    If the cooling system has the extra capacity (and most have) to keep the overall engine temperature cool, then it will do so. The fans may come on more often, but everything will be as normal. It doesn't, however, prevent heat build in areas that aren't specifically water cooled, like exhaust valves and manifolds etc.
    Last edited by diesel dog; 20th July 2010 at 21:06.

  10. #10
    Regular Member OPC's Avatar
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    Vehicle : Vectra-C

    Trim : SRi XP2 Nav

    Engine : 1.9 CDTi 150

    Year : 2008

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    Never had the fan on mine yet and normal driving (egr zone) has not seen temp gauge change, still sits around 85 degree, a bit of spirited driving or heavy trafic has seen 90 degrees.

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