It sounds like the bearing isn't seating correctly. I change bearings on my fox 45, 50 & 60s but do it differently and have no problems. I heat the case and chill the bearings, then insert the bearings into the case and use a soft piece of wood across the bearing to gently tap in evenly. Then slide the crank in. The crank slides into the bearings at ambient temp and pushes in easily without using heat or chilling either part. The only difference I see here is I don't seat the bearing with the crank.

I had an inner bearing come apart while running on a 60 and it totally distroyed the piston, liner and head...

Good luck.

bp

     Hello Bill and Steve:

     Thanks for the replies.

     I thought about this issue for awhile and I am of the opinion that the bearing is not being seated deeply enough in the case to permit the outer race to take share the tension of the crankshaft.  The inner race may be being forced forward and is being distorted thus  the resistance to turning and the noise.  Perhaps I need to clean the bearing seat in an aggressive manner.  I have no way to determine when the bearing is fully seated other than a quiet bearing.  Perhaps "pounding" on the bearing with a tool that will contact both races simultaneously may properly seat the bearing.

     I was "given" this engine and the owner did not know what brand it was or who manufactured it.  I think that it is a Fox .45 RC.  When I received it, it was totally gummed with some form of yellow varnish that resisted many attempts to be removed.   I think that the parts are now clean.  I have no knowledge of how this engine functioned prior to my possession.

    I have no idea if a bearing may be seated in the case without using the crankshaft to partially align it in the case while it is being seated.  I have seen bearing alignment tools that look and function very similar to what the crankshaft is attempting to do but they support both of the races.

    Again, thanks for the help.

                                                                                                            Be well my friends,

                                                                                                            Frank McCune

                                                     

     

    Hello All

    Back from the test stand where I discovered that I had a tiger by the ail.  I put a large and heavy 10x3 plastic prop on the engine for break in purposes and lo and behold it started the first flip!  While I was running the first tank through the engine, I was able to adjust the hi and lo needle valves.  I did not lean the engine out as I do not think that it has ever been run but It was fast enough to almost cause me to soil myself!  I have never seen that much power from an engine!  The subsequent starts were all done via an electric starter as tom avoid any chance of getting hit by the prop.

    Now what to do with this engine? Lol  I would like to find a c/l venturi for it but that may be a difficult task.  What airplane would be good for stunt with such a powerful engine?

                                                                                                                    Be well,

                                                                                                                    Frank Mcune

  

Frank    I am curious how you can tall how much power it has in a test stand with a 10/3 prop.

"I have never seen that much power from an engine"

      Hi Eddy et al.:

      I did a bit of "research" to determine the horsepower that this engine may be producing and this is what I found:

      10x3 prop at 16,000 rpm=.834 hp.

      10x6 prop at 14,000 rpm=1.118 hp.

      I am only speculating that this engine may be capable of producing this much hp.

       After being around stunt engines turning about 10,000 rpm., that appeared to be quite tame, this engine sounded like a beast!  Perhaps it is all in the ear of the beholder! Lol

                                                                                                                                 Have a nice day,

                                                                                                                                 Frank McCune

My bench running notes from 20+ yrs ago show it tached 13.5k rpm with a 10x6W wood Rev Up Pro prop.  Fox Gold Star fuel 5% x 20% all castor. 30' above sea level. Temp 90F & humidity 95%.  This is the early 45bb cl with small exhaust.   
 

I've been here 66 yrs so the heat doesn't bother me like those folks who move here from cooler/drier climes...but they usually adjust after a couple yrs too.