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Join Date: Jun 2011
Location: West Vancouver B.C.
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Re: Perkins 4.108M DIY Rebuild -- A Narrative
I'm a fan of Zinc Chromate on aluminium. I've never had a finish lift when it was on top of ZnCrO4. I've never put it on anything that got really hot though.
It's the standard coating on aircraft internal structures so it can take ultra cold but, as I say, I don't know about hot.
I presume you are referring to things like the heat exchanger tank, thermostat housing & so forth? If so, they should be no problem. Anything close to the exhaust ports or manifold could be though.
One tip I learned the hard way - don't paint the major parts individually before assembly. I did that once and ended up with small areas that were exposed with no paint on them. Bits of the block deck that the head didn't cover and so forth.
Once you have the long block assembled, paint it and then put the hoses, clamps etc. on so they don't get covered in paint the way the factories do.
You also don't want paint in the grooves of your pulleys or they can slip. A trick for painting them is to hold them with an old V-belt in the groove while you spray them.
I, myself, personally intend to continue being outspoken and opinionated, intolerant of all fanatics, fools and ignoramuses, deeply suspicious of all those who have "found the answer" and on my bad days, downright rude.