I am going to replace the roller main bearings in our 1911 Stanley model 85 with modern bearings. The 30 hp engine's main bearings are worn too far beyond specifications. Does anyone have a modern main bearing number available that I can use to order new bearings? I have the later engine with the 1 1/8" engine frame rods. Machining new main bearing retaining hardware is no problem to me.

Pat look at SKF roller bearings
It looks like the largest diameter you could use is five inches or a whiskers more.
see attachment

SKF roller bearings
[www.skf.com]

Rolly



Edited 2 time(s). Last edit at 11/02/2006 02:24AM by Rolly.

Thank you Rolly. I had planned to use the SKF roller bearing, but I thought that I could save some time if I already had a bearing stock number from which to order. I guess I will going to the bearing house and do some design work at their sales counter. I have done it before.

Dear Pat
Two bearing numbers that may be close to what you need are 1016 or 1017 standard single row rollers. 1016 is 4.9213 OD and 3.1496 ID and 1017 is 5.1181 OD and 3.3465 ID both have a width of 0.8661 or you can go the explorer class and get a little wider bearing 0.9449

It all depends on what you can grind out your existing outer races to, unless you make new ones. I don’t think you need to do that. If you can use the 1016 then the ID will be smaller and you can turn the existing inner race to the ID of the new bearing.
The drawing I did was to the dimensions of what was there and who knows if they are original or not.
Good luck on you project and document everything you do for the rest of us.

Rolly

Pat,
Use the biggest bearing you can fit in. Remeber the 30HP engine in 70% cutoff with 600psi on the steam chest can produce a stall torque of over 3000 foot-pounds and a bearing load of over 10,000 pounds. I would want a bearing rated with a dynamic load capacity of at least that at 100RPM with a 500hour life---its all in the SKF catalogs.
George

George
Both bearings I listed are over 18,000 Lb Static load and if you go to the Explorer grade in the same size range there a little wider and are over 30,000 to 35,000 Static load.

Rolly

Dear Rolly, For main bearins in our Stanley 30 HP engine with 1 1/8" frame rods, I ended up using the SKF Explorer NJ 215 ECP/C3. They fit fine with very little machining needed. For connecting rod bearings I used the McGill SB 22208 C3 W33 self aligning bearings. The engine should now be long lived with out any bearing problems. We will see how it runs out when it is in our 1911 Stanley model 85.