Bearing replacement

Bearing replacement

Post by Paul McIntos » Sat, 27 Oct 2001 15:51:23



Installing a bearing by force can distort the cases or outer bearing race,
and dent the races and balls.  It can also reduce the interference fit.  Any
of these can cause premature bearing failure.

--
Paul McIntosh
Desert Sky Model Aviation
Engines, planes, bearings and boats
http://fly.mcintoshcentral.com
.


Quote:

>   Don't worry about it.

>   CR


> > Hello,

> > A friend of mine replaced the front bearing on his Supertigre S61
> > by force(used a bearing puller), I subsequently discovered
> > that the proper way was to heat the case in an oven and it would easily
drop out.

> > What are the implications now ? The engine has not been started and
appears
> > to turn ar normal.

> > Thanks,

> > J

 
 
 

Bearing replacement

Post by Charles & Peggy Robinso » Sun, 28 Oct 2001 09:43:04


  OK, so  the operative word in yous post is "can."?    The deed is done.  The
original poster said the engine seems normal.  If nothing's binding, may as well
run it and see what happens.

Cheers,

  CR

Quote:

> Installing a bearing by force can distort the cases or outer bearing race,
> and dent the races and balls.  It can also reduce the interference fit.  Any
> of these can cause premature bearing failure.

> --
> Paul McIntosh
> Desert Sky Model Aviation
> Engines, planes, bearings and boats
> http://fly.mcintoshcentral.com
> .


> >   Don't worry about it.

> >   CR


> > > Hello,

> > > A friend of mine replaced the front bearing on his Supertigre S61
> > > by force(used a bearing puller), I subsequently discovered
> > > that the proper way was to heat the case in an oven and it would easily
> drop out.

> > > What are the implications now ? The engine has not been started and
> appears
> > > to turn ar normal.

> > > Thanks,

> > > J


 
 
 

Bearing replacement

Post by Paul McIntos » Sun, 28 Oct 2001 17:50:52


Yes, the operative word is "can".  It may not happen, but why take the
chance?  Just because the engine runs now does that mean it will continue?
Bearings should last years in normal running.  If these bearings fail after
6 months, will he remember that the bearings were installed improperly or
will they be blamed?

--
Paul McIntosh
Desert Sky Model Aviation
Engines, planes, bearings and boats
http://fly.mcintoshcentral.com
.


Quote:

>   OK, so  the operative word in yous post is "can."?    The deed is done.
The
> original poster said the engine seems normal.  If nothing's binding, may
as well
> run it and see what happens.

> Cheers,

>   CR


> > Installing a bearing by force can distort the cases or outer bearing
race,
> > and dent the races and balls.  It can also reduce the interference fit.
Any
> > of these can cause premature bearing failure.

> > --
> > Paul McIntosh
> > Desert Sky Model Aviation
> > Engines, planes, bearings and boats
> > http://fly.mcintoshcentral.com
> > .


> > >   Don't worry about it.

> > >   CR


> > > > Hello,

> > > > A friend of mine replaced the front bearing on his Supertigre S61
> > > > by force(used a bearing puller), I subsequently discovered
> > > > that the proper way was to heat the case in an oven and it would
easily
> > drop out.

> > > > What are the implications now ? The engine has not been started and
> > appears
> > > > to turn ar normal.

> > > > Thanks,

> > > > J

 
 
 

Bearing replacement

Post by Charles & Peggy Robinso » Sun, 28 Oct 2001 23:27:36


  Will he remember?  Who knows, I can't get in his head.  What would you have
him do?  Take it back apart?  Don't know if that's such a hot idea.  After all,
he didn't do it right the first time. ;^)  Why compound the possible error?
If the crank spins freely, as reported, It should be OK.

  OTOH, he could heat the crankase with a torch to relieve any stresses before
running it.  BUT, if the bearings are damaged, they're damaged.  No going back.

  Cheers,

  CR

Quote:

> Yes, the operative word is "can".  It may not happen, but why take the
> chance?  Just because the engine runs now does that mean it will continue?
> Bearings should last years in normal running.  If these bearings fail after
> 6 months, will he remember that the bearings were installed improperly or
> will they be blamed?

> --
> Paul McIntosh
> Desert Sky Model Aviation
> Engines, planes, bearings and boats
> http://fly.mcintoshcentral.com
> .


> >   OK, so  the operative word in yous post is "can."?    The deed is done.
> The
> > original poster said the engine seems normal.  If nothing's binding, may
> as well
> > run it and see what happens.

> > Cheers,

> >   CR


> > > Installing a bearing by force can distort the cases or outer bearing
> race,
> > > and dent the races and balls.  It can also reduce the interference fit.
> Any
> > > of these can cause premature bearing failure.

> > > --
> > > Paul McIntosh
> > > Desert Sky Model Aviation
> > > Engines, planes, bearings and boats
> > > http://fly.mcintoshcentral.com
> > > .


> > > >   Don't worry about it.

> > > >   CR


> > > > > Hello,

> > > > > A friend of mine replaced the front bearing on his Supertigre S61
> > > > > by force(used a bearing puller), I subsequently discovered
> > > > > that the proper way was to heat the case in an oven and it would
> easily
> > > drop out.

> > > > > What are the implications now ? The engine has not been started and
> > > appears
> > > > > to turn ar normal.

> > > > > Thanks,

> > > > > J

 
 
 

Bearing replacement

Post by Daniel Dupon » Sun, 04 Nov 2001 04:09:20


Being a Aircraft mechanic, for a number of years bearing should be
done with puller and press, never apply pressure on the inner race but
only on the other race...have remove and installed them in some pretty
tight location with a puller and a socket of the right size of course.

For my RC engines I always used heat it's just plain easier, and that
way I don't have to bring thing at work.

Daniel

On Sun, 21 Oct 2001 00:38:24 +0100, "Paul McIntosh"

Quote:

>Did he use the bearing puller to INSTALL the bearing?  How?  If enough
>pressure was placed on the center race to install the bearing into a cold
>crankcase, the races were likely damaged and the bearing will not last as
>long.