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Painting my engine a few questions

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Sesman:

--- Quote from: H2Eric on October 21, 2023, 12:02:29 PM ---Any thoughts on preparing the surfaces first? Vapour blasting perhaps or a jolly good scrub with Brillo pad or something similar.

--- End quote ---

Personally I vapour blasted and etch primed. Though simonizvht31d doesn’t require a primer. Great care is needed to avoid any ingress of contaminants. Alternatively go for soda blasting, but again clean, dry, clean dry and clean again. I blocked all holes and protected all bearing surfaces, but still cleaned every gallery and oil way scrupulously. Beware of the camshaft oil gallery as the alloy bungs need removing and replacing.

SteveW:
How easy are the bungs to remove?

Oddjob:
You don't need to remove the bungs, that's just being over cautious. The end tunnel is a straight line, if there was anything inside it you'd be able to see it, a thin bristle brush down the internal one until you see it come out into the straight gallery is more than sufficient. I've just blown all mine out with an airline after bead blasting the head and never had an ounce of trouble. Just make sure it's free of oil/grease beforehand and it should be fine, bung the holes up if your paranoid.

I'd advise a small forward facing wire brush in a Dremel and really get into the corners of the crankcase, that's where the oil/grease/crap is hiding, painting over that means it will just blow off later when the engines hot and after that it will just start the rest flaking. 

Sesman:
“The end tunnel is a straight line, if there was anything inside it you'd be able to see it, a thin bristle brush down the internal one until you see it come out into the straight gallery is more than sufficient”.

Can you show us that please,Ken. I thought the only access to the cylinder head horizontal cam bearing feed gallery was via the cam shaft bearing oil feed or end bungs. I’m not sure how blast material could be seen. I’m not saying you are wrong, it’s just that I don’t understand. TBH, when I removed mine I found the gallery to be spotless.

Oddjob:
Can I show you? Not without a spare cylinder head and even then it would be difficult as the camera would need to focus real close.

However imagine the head and how it's been drilled for the oil gallery. The end gallery meets the barrels and is closed shut by the oring, that is a straight line drilling, if you hold the head up to the light I'd say you can look right down the gallery, if there was anything there blocking that gallery you'd be able to see it. A small bristle brush pushed up the gallery should clear anything inside it. The connecting gallery which runs to the inner cam journal was drilled before the bung was fitted, this crosses the vertical gallery and carries on until it's under the inner journal, Honda then drilled down from the inner journal to meet the horizontal drilling. Nothing special about that, just simple engineering. So a bristle brush pushed down that gallery from the cam journal so long as it's flexible enough will just bend around the join where the 2 drillings meet ( I'd imagine Honda smoothed out that join with a flexile reamer) it will then pass along the gallery until it meets the vertical drilling, it will then stop as it will hit the back of the bung. If you're looking up the vertical drilling you should see the end of the bristle brush. Any debris in the gallery should have been pushed into the vertical drilling by now, if so that an be pushed out easily. 

That make sense?

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