Exhaust heat shields

4.2 V8 40v biturbo - 450 bhp
4.2 V8 40v biturbo - 480 bhp (plus)
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Rstoney
2nd Gear
Posts: 102
Joined: Fri Aug 01, 2014 3:17 pm

Exhaust heat shields

Post by Rstoney » Fri Jul 22, 2016 9:00 pm

Has anybody had any issues with loose heat shields around the exhausts? The 4 sections over the rear backboxes have perished where the nut/washer goes through. I've tried using a larger washer to hold them together, but the studs have lost their threads due to the rust.

Has anybody got any work arounds? I.e riveting them to the underside? Or shall I just stump up and buy new heat shields. Any idea of the costs (I presume there will be some RS tax applied?)

Ajc
4th Gear
Posts: 765
Joined: Sun Mar 27, 2016 7:27 pm
Location: Cheshire

Re: Exhaust heat shields

Post by Ajc » Fri Jul 22, 2016 9:31 pm

Sadly it's common on most cars due too the aluminium heat shield touching the steel fixing . Causes galvanic corrosion. Really wouldn't recommend drilling and riveting the underside . I'd just be looking too replace the Shields myself. As for the fixings u can either grind them off and tac weld a new stud on or use a riv nut insert and bolt them on .
Cheers Al

04 c5 rs6 , Ebony Black, Bare shell repaint , Milltek's, PSS9's,Hotchkis Arb's,Gutted precats, hybrid turbos, Bosch 044 ,And an annoying EML light

Mɐʇʇ
Cruising
Posts: 2720
Joined: Tue Oct 07, 2014 8:30 pm

Re: Exhaust heat shields

Post by Mɐʇʇ » Fri Jul 22, 2016 11:09 pm

Yeh, mine are going the same way too.
"not a professional engineer, mechanic and mechanist"

Jultsu
Neutral
Posts: 43
Joined: Fri Oct 03, 2014 3:10 pm

Re: Exhaust heat shields

Post by Jultsu » Mon Jul 25, 2016 12:42 pm

Right side (up to VIN 4B-3-904500): 4b3804172. Left side 4b3804171. Later models have a different part, add A to the end.


A quick look at a german website:

WAERMBLECH
OE-Nr: 4B3804171
87.60 EUR


WAERMBLECH
OE-Nr: 4B3804171A
198.90 EUR

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