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1st December 2019, 11:20 | #1 |
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Exhaust heatshield problem
Having cut my old exhaust off prior to fitting a new one, I thought I'd whip the heatshields off and sort out the odd blip of surface rust underneath the edges, mostly around the bolt holes.
I discovered the shield itself has been attacked by moths, or at least that's what it looks like. There seems to have been some sort of chemical reaction where the steel bolts go through the aluminium sheet. I don't want to put it back on like this as it can't be taken off again without dismantling the exhaust. Three of the four RH bolt holes are like this to some degree - oddly enough the LH holes aren't. It if was flat I'd bolt two strips of aluminium sheet along the RH side to act as clamps - that would solve the problem. It's not flat though. Last edited by Blink; 1st December 2019 at 11:23.. |
1st December 2019, 11:51 | #2 |
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I made aluminium washers from an old ECM casing, to avoid accelerated electrolytic corrosion however pan menders are just as good
It's not the worst I've seen Brian P.S. your exhaust assembly paste will allow for subsequent dismantling of the exhaust if required |
1st December 2019, 14:09 | #3 |
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instead of two strips I used one and bent it over. Drilled for the bolt hole then offered it up so the bolt hole lined up, drilled through in two places and riveted the two "strips" together. Then bolted to the car
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1st December 2019, 14:34 | #4 | ||
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Quote:
PS. Good news re the paste. Quote:
If so, how did you match the contour of the shield - it's not flat, there's a long hump between each pair of bolt holes, i.e.
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1st December 2019, 14:35 | #5 |
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PS. Ooh, Xmas smilies. Lovely :icon_r olleyes::icon_questio n::lipsrseale d:
Looks like some of them don't work. |
1st December 2019, 14:49 | #6 |
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I just put two long metal jubilee style clip/ties around the whole pipe and cover to give extra support and eliminate the rattles. Worked a treat.
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2nd December 2019, 11:03 | #7 | ||
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2nd December 2019, 11:09 | #8 |
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worth while plopping some goo / sealant between the shield and the Chassis and the washer and the Shield to help/ slow the dissimilar metal corrosion.
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2nd December 2019, 12:58 | #9 | |
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I'm still toying with the idea of using flat sheet strips running between each pair of bolts - a bit like the strap on the fuel tank. If I can get the 'humps' exactly the right height it'll clamp the whole contact surface between the bolts. Each strip would be 40mm wide and (say??) 2mm thick. Here's one supplier (see Flat Bar or Sheet options) - https://www.metalswarehouse.co.uk/custom-cut-metal/?gclid=EAIaIQobChMI-se1mIOX5gIVCLTtCh0bdwDXEAAYASAAEgJMgPD_BwE Good idea again, although I'll be painting the area underneath the heatshield anyway and I'll use stainless steel bolts. |
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2nd December 2019, 13:05 | #10 | |
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