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PV blowing exhaust manifold

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Old Apr 23rd, 2018, 10:21   #1
arcturus
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Default PV blowing exhaust manifold

Hi, I am due to have my PV on a stand at a show this coming weekend,about 400km from here. The problem is that my exhaust manifold gasket is blowing and although I have ordered a new one I don't expect it to get here in time. Any suggestions for a temp' fix which would last for about 1000km?
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Old Apr 23rd, 2018, 10:29   #2
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Take it to bits and apply some of this =>

https://www.permatex.com/products/ga...-gasket-maker/

(Permatex copper)

You do need to clean the surfaces quite well for a decent fix - looking at the head of my B20 the gap in between cylinder #2 and #3 looks like the weak point - it is of course on the under side the manifold...
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Old Apr 23rd, 2018, 13:24   #3
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The Permatex is good but it will probably take as long to get as a new gasket. Any exhaust repair paste, tube or tin, neatly applied should do the trick in the short term, especially if you can use it with the old gasket. Good quality locking nuts help to keep it all solid. Rusty studs tend to make them loosen quickly,
IF you have an exhaust shop not too far away. Take the old gasket in and see if they can match it close enough to work.
I hope the show goes well.
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Old Apr 23rd, 2018, 14:50   #4
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arcturus;

"exhaust manifold gasket is blowing" Exhaust manifold gaskets typcally "blow" because they are not being compressed by the two flat and parallel surfaces...which means surfaces are not compressing tight enough OR warped and not parallel, or some combination of the two...question is, is this one of those cheap, simple fibre gaskets (where there is now material missing) or one of the metal jacketed fibre sandwich style (by Elring, which I don't even think are possible to blow out because of their construction)...if the former, and there is a gap, it needs to be filled with an appropriate high temp qualified material...I'd loosen manifold to enlarge gap, and fill gap with a fibre filled exhaust sealing paste (which hardens when it gets hot, and which has some body, which will fill gap). Tighten as best you can...if there are issues with studs, those should be made right...they are doing an important job...

Good Hunting!

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Old Apr 26th, 2018, 14:56   #5
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I used one of the high temperature resistant pastes that forms a temporary seal around a hole or gap. It’s been on for three weeks and no problems so far. I wouldn’t even bother putting a jubilee clip round it.
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Old Apr 26th, 2018, 18:06   #6
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Problem solved for the time being. As usual new gaskets late on arrival, probably come tomorrow after I have left for the exposition. Sods law. Obtained some exhaust sealant and pulled off the manifold. Coated both sides of exhaust gasket liberally with sealant and replaced manifold. So far on test run al AOK. The bummer is that I will need to strip at all down again later to fit new gaskets.
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