997 Tandem pump covers

[Roundm]

Hi,

I've read loads about the only piece of ungalvanised mild steel in the engine bay of a 997.1 - the Tandem pump cover and how these need replacing.

I've also found apc making an aluminium replacement cover - and a plastic one (and 9m a stainless one) with negative comments about how aluminium and stainless behave as bearing surfaces - but the comments don't seem to be from anyone with real experience of using any of these covers.

So - has anyone tried one of these replacement covers? - which seem to have nice properties (half the price of a pump and no corrosion problems) but I struggle to find any real knowledge.

looking at the design911 website - http://www.design911.co.uk/fu/pt856_859_2366_-cma8...

you seem able to buy replacement pump innards but not the cover separately (I assume therefore you reuse the cover - which is the bit that rusts!)

any tips here (please!) and thanks

Mark

[Roundm]

Stig

Thanks for the reply - It's not leaking at the moment - although I haven't finished buying the car yet, so can't really poke and prod too much

I was thinking of cleaning loose rust off and trying to treat it with something containing phosphoric acid as I seem to remember my school chemistry teacher saying something along the lines that it will convert iron 2 oxide into iron phosphate and that the second is impermeable to air (and so will prevent further rusting). I think you can paint over this layer.

However the idea of a plastic or aluminium cover instead of the pressed steel original is appealing - if it works. 9m seem to have no more stainless covers in stock - and didn't indicate when any might be forthcoming - which makes me suspicious that they were not successful somehow. The others seem new and there seems little experience with them - hence my post.

Hopefully an engine builder might comment (someone from Hartech if I'm lucky) with knowledge of these - pros/cons and perhaps life expectancy and failure mode would be a complete pic.

fingers crossed someone has tried one/some of these.

Mark

[Roundm]

Hi. I have an aluminium cover replacement on my current 997.1tt. I never actually had to replace the tandem pump on my previous 987.1 or 997.1

Having said which - the tt came with it already fitted and it’s given no reason to doubt it at all in the 9k Miles I’ve done since getting the car (and it looks nice into the deal - I’m a sucker for brushed ally).

[Roundm]

Bullet-Proof_Biscuit said:

Thanks, where did you source the aluminium aftermarket covers?

Cheers

I didn’t - it came with the car. Although the part was from ACP as per Hermes answer