Old HotRodder

[50sFlash]

That's OK Mike, April Fools Day was Wednesday. Ya didn't fool me. LOL One has a large hole under it, the other has like a 1/16" hole. Since I can't even find a listing for Boyesen valves for this thing I guess it doesn't matter what they do. The top cylinder had a sticky top ring and blow-by scuffing, and residue in the intake side, but the ring lands are good, so I think it will clean up OK. All the bearing surfaces are good. Who sells cheap parts?
One other thing, I thought it had a 3" bore, but it measures like 3.060 with my cheap calipers. I couldn't have a 60 0ver stock from factory could I?

[JohnsonM50]

I dont know about the bore, biggest over Ive seene was 40 over for the 31.8ci. Best bet on parts is spare motors but some stuff should be new. Look up the Mastertech, if he has em itll be reasonable.

[mac19f]

The first year 40hp engine(1960) had a weak crank. Johnson offerred to replace all of the powerheads under warrantee with the next year's powerhead with a stronger crank. Some people did; some didn't.

The two little valves are crankcase puddle drains. The lower seal is carbon. It has an o-ring inside that should be replaced. If the carbon itself is not broken or scarred it can be reused.

[Mark75H]

The two little valves are crankcase puddle drains.

Thanks Greg

I thought that's what those are, but not being an expert on that motor, didn't want to say so. Is that what made these motors famous for leaving a sheen on the water?

[50sFlash]

Thanks Greg. That's almost obvious when you look at it and think. It doesn't vent to the atmosphere Sam, I think the oil slick came from running 25 to 1. There's a ton of carbon build-up in this one. Well I got a bunch of Dremel work to do. Ahhhh the smell of grinding cast iron. It's right up there with resin and nitro.

[Mark75H]

It goes down into the leg doesn't it?

[50sFlash]

There's a cover and gasket. I think it comes out, and goes back into the intake side.