Thread: Td5 exhaust manifold: Spacers for wurth studs?

I would recommend Belleville washers instead . They seem to work well on mine.
Regards PhilipA

OK thanks, any idea how much you used per stud. Looks like they're 0.9mm thick?

I haven't bothered with spacers on the three Td5s I've replaced the studs on. Just the nuts and copper locknuts. Studs long enough for small spacer only.

Also Td5s are are remapped and none have broken the studs. Are you drilling the holes on 1 and 5 to give it expansion room?

OK thanks, any idea how much you used per stud. Looks like they're 0.9mm thick?

I think that I used two on each stud as you want a bit of tension. I don't think mine were 0.9 MM thick, more like 0.5.

IMHO it's important to elongate the end holes and the next ones in tapering towards the centre, the elongation being on both sides so that the manifold can lengthen.
My manifold had about 2MM warp which increase when you deweb it.
I also recommend ceramic coating.
Regards PhilipA

Ceramic coated, webbing sliced, faced, standard replacement studs and nuts.

180,000km since doing that, fully tuned up with VGT.

Not one single problem since

Despite the discussion, it appears from Discofender's pics that he used stainless nuts and flat washers as as spacers. Does this achieve the same objective as using spacers and Belleville washers? Are the stainless nuts also torqued to 25nm and the copper nuts torqued to 25nm on top of those?

I had been planning to use the Wurth studs (I think these the same thing as the Mercedes studs that PhillipA refers to?), then a flat washer at the manifold to spread the load over the elongated holes, followed by a spacer, Belleville washer and the copper nut. Is this overkill? Should I just use a single 0.9mm thick Belleville washer over the elongated manifold hole and then the copper nut?

Interested to hear views. My 2003 Defender TD5 is still original, no warped manifold, 159k, but I am doing the EGR removal and fitting larger intercooler and silicone hoses over the forthcoming Xmas break so keen to pre-plan to ensure all goes smoothly, so will do the manifold and new studs at the same time. I have a spare stage one NNN500020 ecu prepped and ready to install but it's not going in until all the above have been done and EGT fitted.