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[Andy89]

I'm putting together a reconditioned engine, and I want everything to be spot on.
And as the alternator and the starter motor are earthed through the engine block, i thought it might be a good idea to have some conductive grease between them to keep out rust.
Or is it not necessary at all?

The enginge and the car its going into:

[tigers_gonads]

Just give the surfaces a clean up with a bit of scouring pad.
Should be good enough 

[waspy]

I've removed & refitted quite a few starters & alternators on various cars over the years, I've never actually come across any corrosion.

[Andy89]

So it will be good enough by just removing the paint and have some clean surfaces?

[Kevin Wood]

A bit of copper grease won't go amiss. I have seen situations where moisture has got between such surfaces and corrosion has caused a poor connection.

[albitz]

That engine looks like a new one - very nice.

[Andy B]

A bit of copper grease won't go amiss. .....

Have you checked with Gixer ........   

[Kevin Wood]

A bit of copper grease won't go amiss. .....

Have you checked with Gixer ........   

No.. He'll be along soon enough.