Duffy Electric boats....?

I don't think 98F is too hot for a bearing that's not designed to be water cooled. Does the bearing have grease in it? It seems like it should be fine to even higher than that such as 130F, I would think. I'm sure auto wheel bearings get a heck of a lot hotter than that.

Thanks. I just thought I'd compare with another Duffy owner. Was thinking another Duffy owner could say they run real cool or they get so hot you can't touch them, some indication. Bearing has grease. Your right about 98 degrees but that was at less than full throttle and the temp. was still climbing. Tomorrow I'm going to let her go for a longer run and see there the temp. goes at the hottest. Also in a few days I'll have a hand held digital thermomter which is better than this thing I have hooked up know for temp.
Thanks for your thoughts.

Thanks Norseman ! I'm having a hard time posting a picture. I see your set up in message #109 and mine is the same with a diferant motor. My grease point was facing down also, strange. Duffy called it a forward bearing so I did also, you call it a thrust bearing but we have the same thing. Its a link belt Dura- Klean 200 series intermediate duty ball bearing WFX 3S216E. After your next good spin reach down and feel the outer white housing and the inner black sleeve....I sure would appreciate it !
Gerardo, at the factory, has been helpful along the way with e-mails and I don't want to be too pushy as he has gone silent on me ? It might be too windy today but I want to go out with my heat gun and see what I really have for temperature. Maybe more beer would help cool things down ?
Todd

Norseman....I did it ! The black thing on the bearing is a heat probe. The wood block is just in case the metal support were ever to give way the motor would not smash into the dripless water connection.You'll notice a shim behind the rubber bearing block, that is so things aligned up correctly. When I installed this new bearing I did not know that the bearing would pivot in the housing for good alignment.

I took the Duffy out for one hour at a constant 80% throttle ( 5 m.p.h. ) and with a infrared thermometer recorded the bearing temperature. It toped out at 140.9 degrees and then came down to 135.6. At 140.9 degrees you can touch it for 7 seconds before you burn your finger. At a nice middle throttle position ( 3 m.p.h. ) in went to 117 degrees in 20 min.
The old, but reworked, motor reached a max. temperature of 151 degrees.
Any thoughts if my bearing is getting too hot ?
Todd

That a boy....take her out !
Shoot the bearing next time, I can't wait to see what you have ?

I started out at 60 F and after 1 hour of 80% throttle I topped out at 140.9F. The bearing is 12 hours old ( new ) and I've confirmed they come pre-greased from the factory plus I gave her 2 addtional pumps. I did tell my tale to Gerardo at Duffy in a second e-mail and he responed " let me do a test to see what happens ". I'll let you know what he says.
Do you know if you " topped out " at 130.4 or could it still of been climbing ?

How much does the bearing cost? If it's cheap, just run the thing and see what happens.....

The bearing only costs about $100.00 and I most likely , with what I'm learning, I'll just run her. My concern has been that in taking this whole thing apart with new shaft and drippless and new bearing etc. I have some alignment or tention wrong that could cause her to will really over heat or cause other problems. Did I screw up ? ( I don't think so ). I also just love the process of figuring stuff like this out.
Thank you both and I'll post what the factory says.......here's to ya !

How hard is it to remove the belt? Also if the belt is too tight, it could pull the shaft out of alignment. A thought is to try turning the shaft by hand or with a wrench/pliars with the belt disconnected and see how much resistance there is.

Thanks for the thought Capt. J. I want to see what the factory comes up with before a take her apart agian. My problem in doing that is the set screw on the pulley and 2 set screws in the bearing are on with "red " high strengh Locktite. I've never dealt with that but don't you have to take a blow torch or sodering iron to it to get it loose ? The package says 500 degrees.
Todd

Gentlemen,the bearing mystery is solved and I don't have to tear mine apart ! Norseman gets 130.4. The factory ran a boat for an hour for me and got a 130. I had a spare bearing and ran a bench test using the Mrs. mix-master for power and got a 133.5 after 2 hours and a 157.4 at a much higher speed. The manf. has a heat range on the part " up to 225 ".
So I'm not too concerned about seeing my 140.9 out in the bay.
Whats next ?

If the girls aren't already long gone by the time the Duffy guys get there