There are a couple of versions of an additional front mounted bearing.
It's called a 5th bearing, BTA, (better than air), etc. Go to flycorvair.net or
Dan Wesemans Fly with? SPA. Or google Corvallis 5th bearing.?Bill Jacobs
Daytona Beach, Fl.
On Thursday, June 23, 2016 12:44 PM, Kayak Chris via KRnet <krnet at
list.krnet.org> wrote:
Well this set of comments would have me steer well clear of GPASC
engine. Even if they are reliable when properly mated and assembled,
it sounds like their crankshaft/hub solution is not very serviceable
down the line.
After all these years how can this not been resolved? Presumably the
revmaster solution is more certain in service and serviceability.
Having built one of these several times, I'm not
> a fan of the keyway setup.? The slots are in hub and crank are shallow, and
> the key is provided as a square key that you need to grind (or mill) down to
> something way thinner to fit between hub and crank. Getting a good fit with
> maximum material is trial and error. The key is only there to ensure the
> timing mark stays constant if the hub is removed.? The taper is where the
> power is transferred.
>
> Crank and hub are also matched sets due to tolerances on the angle.? The hub
> still needs to be lapped onto the crank, which is a two-hour chore by hand.
>
> The hub/bearing clearance is not consistent. The crank and bearing are sold
> as a set, and getting a new bearing for an existing crank is iffy.? I've
> torqued the case to 8 ft-lbs and the crank still spun, then when I torqued
> it to 14 the crank seized.? No amount of refitting cured that one.? I'm not
> a great fan of the prop bolt...1/2" RH threads. Revmaster's is .75" LH
> threads, which can be torqued higher for a better connection. Otherwise, a
> simple engine backfire can unscrew the prop, despite proper torque and
> Loctite 620 on the bolt? threads.
>
> If the crankshaft's oil seal leaks, the hub isn't going to come off without
> a 20 ton press, so tear the engine down to replace the seals, and hope the
> next seals work better.? My luck with those seals has not been good either.
> That's the only place my engine has lost oil.
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