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Blue Blood



Member Since: 14 Jun 2022
Location: Shropshire
Posts: 115
United Kingdom 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 😁
Post #1052299 20th Nov 2024 1:17pm
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Dinnu



Member Since: 24 Dec 2019
Location: Lija
Posts: 3413
Malta 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
Post #1052305 20th Nov 2024 2:42pm
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Blue Blood



Member Since: 14 Jun 2022
Location: Shropshire
Posts: 115
United Kingdom 1990 Defender 90 200 Tdi HT Bonatti Grey
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).
Post #1052309 20th Nov 2024 2:51pm
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Dinnu



Member Since: 24 Dec 2019
Location: Lija
Posts: 3413
Malta 2012 Defender 90 Puma 2.2 CSW Santorini Black
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
Post #1052327 20th Nov 2024 6:29pm
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Blue Blood



Member Since: 14 Jun 2022
Location: Shropshire
Posts: 115
United Kingdom 1990 Defender 90 200 Tdi HT Bonatti Grey
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
Post #1052357 20th Nov 2024 9:12pm
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Dinnu



Member Since: 24 Dec 2019
Location: Lija
Posts: 3413
Malta 2012 Defender 90 Puma 2.2 CSW Santorini Black
No experience with titanium. 1988 90 Hard Top, 19J Diesel Turbo, Shire Blue - Restoration ongoing
2012 90 CSW, 2.2TDCI, Santorini Black
Post #1052376 21st Nov 2024 6:31am
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