Rusty diff housing

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Rusty diff housing

Postby bmv6197 » Thu Aug 20, 2015 10:30 am

Morning all,

A question out of curiosity rather than anything else... I had my car up on a ramp yesterday to check a few things before heading across to Applecross (thanks to Scott at Motorwerks for the use of the ramp!).

Image

Fortunately everything was how/where/moving/not moving as it should be, all fluids were fully contained, etc, but what really caught my eye was that despite the underside being a pretty clean one with very little even surface rust, I was amazed at how bad (cosmetically at least) the front half of the diff housing is. You can only just see it at the bottom of this picture - conspicuous by its brown-ness:

Image

And it wasn't like the surface rust on the catalytic converter heat shield for example, it was proper flaking-off-big-bits kind of rust. A quick rub with a wire brush had debris raining down... I've seen underside shots of other MX5s where the front section of diff housing also looks rusty so I assume this isn't out of the ordinary, and is just a case of the quality and type of steel used, but it is so different to the rest of the car (and from looking at the bolts, has never been changed or removed, so isn't a rusty replacement). Anybody got any thoughts on this?

Thanks,
Brad.
1995 Mazda MX5 1.8iS (BRG)
1996 Eunos Roadster VR Limited (Combination B) [Now sold]
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Re: Rusty diff housing

Postby OldSpice » Thu Aug 20, 2015 10:35 am

Cosmetically displeasing perhaps, but I cannot imagine there is a threat of any resultant failure (bar an oil leak).
They are after all a very thick casting. I'd wager they are the next thickest casting after the engine block?
Often times we see folk during a rebuild giving them a good wiring & a few coats of black Hammerite or similar.
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Re: Rusty diff housing

Postby drumtochty » Thu Aug 20, 2015 10:57 am

Clean and repaint it!
99 Mk2 1.8 IS Silver
08 Mk3 2.0 RC Sport Copper Red
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Re: Rusty diff housing

Postby OldSpice » Thu Aug 20, 2015 11:07 am

Wish I'd just said that Eddie :lol:
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Re: Rusty diff housing

Postby bmv6197 » Thu Aug 20, 2015 11:14 am

Thanks guys - the consensus is clear then :D

Now where did I put that Hammerite...?
1995 Mazda MX5 1.8iS (BRG)
1996 Eunos Roadster VR Limited (Combination B) [Now sold]
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Re: Rusty diff housing

Postby gm » Thu Aug 20, 2015 2:15 pm

I reckon you should clean and repaint it, with some Hammerite perhaps ? :)
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Re: Rusty diff housing

Postby bmv6197 » Mon Aug 24, 2015 1:05 pm

gm wrote:I reckon you should clean and repaint it, with some Hammerite perhaps ? :)


Controversial... :lol:
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1996 Eunos Roadster VR Limited (Combination B) [Now sold]
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Re: Rusty diff housing

Postby OldSpice » Mon Aug 24, 2015 5:13 pm

Thats what I thought....a bit..well...untried or tested! :lol:
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