Eastflight

Hi Everyone
I shall be changing my OS 46AX MkII front & rear bearings soon and would like to replace them with the Brand SKF.
However, before the engine 'strip down' I'd like to ask if someone can provide me with the OS stock bearing numbers (as printed on the front & rear bearings) so that I can pre order my SKF bearings (using a compatibility list from my local bearing shop here in the England).
If they are the same as the 46AX or FX engines then I have no worries since I already have these in my shed.
Any help would be most welcome.
Cheers...!

the Wasp

My Feedback: (1)

just go to Towers an research their sizes, at the bottom of each page it should tell each bearing size,, with that I am sure they are the same sizes

https://www.towerhobbies.com/

Jim

Eastflight

Hi Jim
Thanks for the reply.
Normally I check the T.H website for info. Most times they are quite good but sometimes their Tech Dept are not always accurate in recent years.
I was hoping someone had an actual number on the bearing to be certain.
Regards

the Wasp

My Feedback: (1)

here, try here at the bottom


yee-up, the AX11 uses the same bearing as the the FX


see parts listing,
http://www.osengines.com/engines-air...548/index.html

https://www.google.com/search?hl=en&...dUDCAY#imgrc=_

https://web.archive.org/web/20190106...osengines.com/

the Wasp

My Feedback: (1)

hold on, I will try to find the bearing number you want

Jim

Eastflight

we're getting warmer......
I've seen some of these photo's but still cannot make out the imprint on the bearing itself.
Hope you have better luck.
I think these bearings on the 46AX II are the same as the 46AX but I just wan't to be certain before ordering.

the Wasp

My Feedback: (1)

EDITED

here you go,,

rear Bearing "SKF number,",, 61902TN9
https://www.towerhobbies.com/cgi-bin/wti0001p?I=LXBNYT&P=7

scroll way down, the 50 uses the same bearing
https://www.towerhobbies.com/cgi-bin...EARCH=os+46+ax

Jim

Eastflight

NOTE: OS can sometimes be confusing in the way they mark-up the part numbers and description on there packaging.
For example; when you check the engine parts list that comes with the engine the OS Numbers for example show the following;
OS 46AX (Crankshaft Bearing R) #26730040 (from the manual)
OS 46AX II (Crankshaft Bearing R) #26730005 (from the manual)
The picture above describes the Rear Bearing as being suitable for the 46AX (not the 46AX II) however the part number matches that of the 46AX II Manual.
This is why I wan't the actual number from the bearing itself.

Eastflight

That's great Jim. That's good news for me since I have a couple of those in the shed.
Any joy for the front bearing?

the Wasp

My Feedback: (1)

the stock NTN front bearing is good for the front,,

EDITED) to add, some 5 years ago I replaced my Hyper 50 bearings, I bought an SKF AND a NTN rear bearings, I found the SKF rear bearing to be smoother!!!!!, but I used a NTN on the front, I have never heard any one saying they had a problem with their NTN front bearing, I flew the OS 50 Heli engines for 16 years, I too never had a problem with the NTN front bearings,, I say just use the stock NTN on the front

Jim,

Eastflight

Okay, Just gone onto the same page you looked and the following for the front bearing is according to T.H;
Inner Diameter: .375 in(9.5mm)
Outer Diameter: .875 in(22.2mm)
Width: .280 in(7.1mm)
Bearing Markings & details: JAPAN NTN R6Z

the Wasp

My Feedback: (1)

if you had to you can buy a double shielded bearing and remove the shield on one side, and clean out the grease

Jim

Eastflight

Jim, thank you very much for the assistance.
Very much appreciated.
I'll still try and source the SKF bearing for the 'front' since the prices are much cheaper than OS Stock parts.
I can get x2 SKF for the price of x1 OS stock bearing.
If I struggle obtain like-for-like then I'll resort to the OS NTN bearing for now.
All the best mate and thanks again.

Eastflight

That's true....!

the Wasp

My Feedback: (1)

it's always better to keep as much money as you can in you pocket LOL,, good luck

Jim

Eastflight

PS: Just out of interest, Does the OS 50 Hyper have the same internals as the OS Max 50SX Ringed (apart from the Crankshaft)??

Eastflight

Indeed

the Wasp

My Feedback: (1)

yes, same piston and liner and rod, I have a Hyper 50 in my 46 P-40, I have a over size muffler on it and it will zing an APC 11X8 at 12,200 on 20%, I have it tuned at 11,600, but it was my engine that I rebuilt and it has only 2 flights on it, so I will lean it a bit more after it gets more time on it.. the guys at the club says the plane does 100MPH now LOL

I use the stock Heli crank with a shoulder nut to hold the prop on ,,
OH I still have the larger Heli 60L carb on it, and with that prop it idles better than any 2 stroke I have ever seen !!

Jim

the Wasp

My Feedback: (1)

oops sorry, I actually think the fuel is lower than 20% because I mixed it, I had 30% mixed with 15% to have about 25%, then 6 moths later when I was going to get the plane in the air I mixed in some 10%, I really do not know what the nitro percentage is, a real guess will be around 13 to 15 ????

but I do have 3 gallons of 30% LOL

Jim

Eastflight

Wow, very impressive.
Saw one of those engines on Ebay going for a song (cheap!) and was tempted to get it, but in the end I didn't since I was not so sure how similar they were to the 50SX.
I wish I had bought it now so that I could convert it to 'fixed wing' use.
I love the 50 SX Ringed for me it's the best OS engine. They start with a flick of a finger and so snappy on the throttle.
Thanks for the info.
Happy Landings.....

Regards
Harri

Eastflight

Jim, perhaps this thread was for another Chap?

the Wasp

My Feedback: (1)

well,,, if you want it for a plane, and if you have the 50SX all you need is the larger 60L Carb,, the Heli head is too big and would cool to much for a plane

yes they are good engines

​​​​​​​Jim

Eastflight

Disregard this reply Jim, Didn't have my spec's on. Lol
It makes sense now, Can see again....Lol.
On that note, I shall say Good Night (Good day to you across the pond).

Eastflight

"​​​​​​​Legend".....Thanks Jim

the Wasp

My Feedback: (1)

LOL it's 3,56 where I am LOL

Jim