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types of metals and their quirks when used in fixings, nuts,
Posted: Mon Mar 07, 2011 7:36 pm
by xpress
i was wondering what the correct/ideal materials are on some fixings on the morris.
for instance, the radiator, what is normally used to hold the rad? i think the bolts holding my rad are aluminium/alloy, they look very bright grey and they shear easily.
did they use iron bolts on the morris, some bolts seem quite heavy, heavier than modern counterparts and also quite a bit rusty.
what type of metal bolts are used to hold on the water pump originally and what bolts are used now? stainless? i would personally think brass would be better due to the water/risk of rusting/corrosion?
also, what was used for the studs on the thermostat housing and what is supplied now for a replacement?
many thanks.
Re: types of metals and their quirks when used in fixings, nuts,
Posted: Mon Mar 07, 2011 10:15 pm
by les
Mild steel, brass for the gearbox cover.
Re: types of metals and their quirks when used in fixings, nuts,
Posted: Mon Mar 07, 2011 11:00 pm
by Kevin
xpress wrote:also, what was used for the studs on the thermostat housing and what is supplied now for a replacement?
many thanks.
As Les has said steel, but a useful trick with the thermostat housing is to open up the bolt holes with the next size drill to give a little more clearance on the studs, also I always like to use a smear of copper grease as this stops things seizing up.
Re: types of metals and their quirks when used in fixings, nuts,
Posted: Tue Mar 08, 2011 1:56 pm
by Matt Tomkins
les wrote:Mild steel, brass for the gearbox cover.
i ordered some replacements fro mine from ESM, and they're too short to go through the gaiter and the carpet. longer ones than those sold for the purpose need to be used.
Re: types of metals and their quirks when used in fixings, nuts,
Posted: Tue Mar 08, 2011 5:19 pm
by Alec
Hello Matt,
you must be talking about the gearlever escutcheon, not the gearbox cover that Les meant, those go under the carpet.
Alec
Re: types of metals and their quirks when used in fixings, nuts,
Posted: Tue Mar 08, 2011 5:24 pm
by beero
Don't ever use stainless where you need strength, eg suspension. They are not as strong as high tensile.
This website has a lot of useful info
http://www.britishfasteners.com/index.php
Re: types of metals and their quirks when used in fixings, nuts,
Posted: Tue Mar 08, 2011 10:12 pm
by Matt Tomkins
Alec wrote:Hello Matt,
you must be talking about the gearlever escutcheon, not the gearbox cover that Les meant, those go under the carpet.
Alec
- sorry - misunderstanding on my part
Re: types of metals and their quirks when used in fixings, nuts,
Posted: Wed Mar 09, 2011 7:47 pm
by polo2k
Great site.
The stainless isnt nessesarily weaker from day one, however it is less ductile than a non stainless bolt. In saying that there are hardened bolts that are brittle too!
More often than not the safest bet is to replace like for like. Dissimilar metals will suffer from electrolytic corrosion but this can be minimised by using either a copper based grease or simply a white grease.
Another useful tip is that not every fastener needs to be murdered tight, sometimes less is more!
The spring washers that are used everwhere on a minor are not nessesarily the best choice given the options in modern fasteners. Once a nut is tight the spring is effectively a flat washer and the split allows the exposed thread to oxidise. On the other hand a lot of those washers have lasted over 40 years already so they cant be that bad!