Engines > From Kits/Castings

Here comes the 'Sun'

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redhouseluv:
Time for a new project and I'm going with this old set of Stuart Sun castings. They came in their original box wrapped in what looks like the original paper, but are a little rusty .......... I think they'll be fine once cleaned up. I'd like to eventually couple this to a Stuart Centrifugal Pump which I restored some time ago.

I have an A3 photocopy of the original drawing which I've tried to enlarge, but some of the numbers are still unclear. Has anyone out there got an original copy which I can make use of?


Edit Jo: Removed copy of Stuart Drawings. That blue print is as clear as the early drawings were.

samc88:
That looks interesting!

redhouseluv:
I have a really basic question...........

is there an sequence in which you should machine components when building an engine. I watched a video ages ago which suggested you build from the bottom up; so in this case start with the baseplate, main cylinder casting, crankshaft, connecting rods. pistons etc?

With things like the crankshaft, is it better to machine it first and then make the bearings to fit?
Same with the piston valve, hole first or piston first?

Maybe there are better sequences for different engine types, but being relatively inexperienced, I'd be grateful for any guidance before I fall down some well trodden holes  ;D

pirmin:
i would say, Base first, then maybe attack crankshaft bearings and crank, then you have good spots to reference from ??!

Maybe some more experienced Builders will answer you that better .

Jasonb:
As the crankcase has not mounting lugs I would first do the base plate. Then on move the crankcase - flatten the bottom and tap for base fixings.

You can then fit the base and use that to hold the crankcase to a machinng plate which will give good reference surfaces to machine the top and bore the two holes. Then do the bearing holes and other minor items.

With a cast crankshaft I would machine the bearings first using a piece of ground material as a plug gauge. You can then compare the plug gauge diameter to that of your crank as you machine that.

Then Head, liners, pistons, rods.

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