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Blue Blood

Member Since: 14 Jun 2022
Location: Shropshire
Posts: 116

1990 Defender 90 200 Tdi HT Bonatti Grey

200tdi turbo to manifold studs

Hey all, so getting round to changing the gasket on the turbo to manifold and I thought it would be an opportune moment to change out the studs to 316 stainless steel pieces to help with getting it off in the future. So my question is does anybody know if there is a pre-existing kit for this? And secondly if not don’t suppose anyone knows what the size of the studs are and what nut type is used? (Im pretty sure you aren’t supposed to have washers in but please correct me if I’m wrong). Any help would be much appreciated 😁

20th Nov 2024 1:17pm

Dinnu

Member Since: 24 Dec 2019
Location: Lija
Posts: 3413

2012 Defender 90 Puma 2.2 CSW Santorini Black

I believe they are M8 x 25. Standard nuts, no nylocks.

One thing I will advise is not use stainless. Its weak. 1988 90 Hard Top, 19J Diesel Turbo, Shire Blue - Restoration ongoing
2012 90 CSW, 2.2TDCI, Santorini Black

20th Nov 2024 2:42pm

Blue Blood

Member Since: 14 Jun 2022
Location: Shropshire
Posts: 116

Thanks for that, really appreciate it.

I wanted to use stainless but as I say not just 304 (which is your A2 grade) but more over 316 (marine grade which has much better strength properties).

20th Nov 2024 2:51pm

Dinnu

Member Since: 24 Dec 2019
Location: Lija
Posts: 3413

Actually both 304, or as you well said A2, and 316, A4 grade, both come in either 70 or 80, which is their respective tensile strength. The 80 is less common, and is still almost half the strength of a 10.9 bolt/stud.

Stainless steel is prone to galling, and while a steel bolt may seize due to rust, stainless may seize due to galling.

When I was younger and less knowledgeable about materials (not that I am now), I mounted my alternator with stainless steel bolts. Needless to say, it fell off, although did take a few years to happen. 1988 90 Hard Top, 19J Diesel Turbo, Shire Blue - Restoration ongoing
2012 90 CSW, 2.2TDCI, Santorini Black

20th Nov 2024 6:29pm

Blue Blood

Member Since: 14 Jun 2022
Location: Shropshire
Posts: 116

What about something more exotic like grade 5 titanium?
I’ve found a chap on fleabay that sells some but didn’t know if the size would be alright:
https://www.ebay.co.uk/itm/114056592306

20th Nov 2024 9:12pm

Dinnu

Member Since: 24 Dec 2019
Location: Lija
Posts: 3413

No experience with titanium. 1988 90 Hard Top, 19J Diesel Turbo, Shire Blue - Restoration ongoing
2012 90 CSW, 2.2TDCI, Santorini Black

21st Nov 2024 6:31am

blackwolf

Member Since: 03 Nov 2009
Location: South West England
Posts: 17357

2007 Defender 110 Puma 2.4 DCPU Stornoway Grey

What's wrong with the standard studs? Have you actually had difficulty with them in the past?

21st Nov 2024 8:20am

Blue Blood

Member Since: 14 Jun 2022
Location: Shropshire
Posts: 116

I haven’t but the chat, but sometimes helps me out on my engine bits and bobs has. I think it’s just a case that I’d like to try and future proof as much as possible and I know I could use copper grease and other various bits and pieces but if I can try and mitigate Any potential problems by future proofing I’ll always try. I do intend to keep my truck for a very long while

21st Nov 2024 8:26am

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