On Oct 2, 10:21*am, "mmc" wrote:
"jamesgangnc" wrote in message

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wrote in message
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On Oct 1, 8:32 pm, wrote:
On Wed, 1 Oct 2008 13:26:58 -0700 (PDT),
wrote:

Cannot find metric bronze screws for my diesel water pump, so replaced
em with SS ones. *Yanmar uses these awful Phillips screws on the water
pump covers that get messed up quickly and really dont hold tight
either. *I have used SS allen ones.

I suppose it all depends on the alloy of the stainless and the alloy
of the bronze but they use stainless scleras on bronze direct burial
ground clamps.

I looked on the Galvanic series and most SS is close to bronze.
However, Yanmar used what look like bronze screws instead of SS
although SS is prob cheaper. *Weirdly, the face of the pump that gets
removed when changing the impeller is SS held by the bronze screws.

I suspect they are more concerned about the galvanic corrosion between the
threads that between the pump face and the screw heads. *You could put a
little thread sealer on them before putting them in. *Might help a little.

There is a product called "TEFGEL" that is designed and works great for this
application. It keeps the o2 out of the fitting.- Hide quoted text -

- Show quoted text -

I use a teflon thread sealer from permatex. I use it on the exhaust
manifold threads as well. I'm guessing that the TEF part of your
product also stands for teflon? I suspect any of these will do in a
fairly stable location like this example. Sure can't hurt.