09-20-2016, 09:23 AM
Ted Johnson,
on cranks seals:
10 hours on crank seals is a real low estimate.
They'll usually run a lot longer than that.
I have to say that I've never had any difficulty in making a Mac run a long time.
They're easy to build, though the super series ignitions are still a P.I.T.A.
Just don't forget to seal those six case cover screws with blue Loctite or RTV.
Use a good torque wrench: #10 fasteners don't give a lot of leeway!
On assembly, I just make sure to tease the crank seal lips with a chisel-tipped Popsicle stick so they don't invert, seal the gaskets, use lots of oil on crank seal areas and pistons and go.
Lots of guys use WD-40 instead of gasket sealer.
Your choice.
I use a bent coat hanger to hold gaskets while spraying.
Double check that carb pulse hole for clearance.
If you run alky Mikunis, an external pulse is a good idea.
on another note
I'd never built a Bend (610/820) until about six years ago, and they're the easiest engines of all to do.
They have no vices, and the larger fasteners are a joy to work with.
Love those 5/16" side mount bolts!
A good 610/820 Bend with the exhaust timing corrected will run very well indeed, though they need thinner rings than the stock .062 units!
I expect to have my new Dave Bonbright 610 ready for Fremont.
It'll have .024 rings.
TJ
on cranks seals:
10 hours on crank seals is a real low estimate.
They'll usually run a lot longer than that.
I have to say that I've never had any difficulty in making a Mac run a long time.
They're easy to build, though the super series ignitions are still a P.I.T.A.
Just don't forget to seal those six case cover screws with blue Loctite or RTV.
Use a good torque wrench: #10 fasteners don't give a lot of leeway!
On assembly, I just make sure to tease the crank seal lips with a chisel-tipped Popsicle stick so they don't invert, seal the gaskets, use lots of oil on crank seal areas and pistons and go.
Lots of guys use WD-40 instead of gasket sealer.
Your choice.
I use a bent coat hanger to hold gaskets while spraying.
Double check that carb pulse hole for clearance.
If you run alky Mikunis, an external pulse is a good idea.
on another note
I'd never built a Bend (610/820) until about six years ago, and they're the easiest engines of all to do.
They have no vices, and the larger fasteners are a joy to work with.
Love those 5/16" side mount bolts!
A good 610/820 Bend with the exhaust timing corrected will run very well indeed, though they need thinner rings than the stock .062 units!
I expect to have my new Dave Bonbright 610 ready for Fremont.
It'll have .024 rings.
TJ