Junior eats a transmission bearing

Posted: Thu Nov 13, 2014 11:09 am

Junior eats a transmission bearing.... On the last ride of the year Junior (my F2 suspended 1100 motor equipped project bike) started making a weird humming / vibrating type noise. At first I thought it was a cam chain noise but it changed when the clutch lever was held in. SteveG came over last night and we found the bearing on the inner end of transmission output / countershaft had disintegrated then spun the outer race taking both the upper and lower case halves out. Steve has the images so I will post them soon.

Posted: Thu Nov 13, 2014 11:12 am

Ouch!

Posted: Thu Nov 13, 2014 2:15 pm

The noise was a growl / vibration in the clutch area. We had no idea it would be this. Our thoughts were running towards clutch bearing(s). Ugh.

Some disgusting pictures (both content and quality (Used smartphone, forgot good camera)).

Steve

And in about an hour the motor was out and waiting for new cases:

Posted: Thu Nov 13, 2014 2:59 pm

Could you overbore the hole and run a larger OD bearing?

CB1100F Joined: Jun 18, 2006 Posts: 2526 Location: UK

Ouch..... not seen that before, especially as the bearing outer has a locating dowel to locate it and stop it spinning

Still lucky it happened now at the end of the riding season and not in the spring

Keith

Posted: Thu Nov 13, 2014 8:02 pm

Wow! Bummer, that's a new one.

Posted: Thu Nov 13, 2014 8:52 pm

That sucks Doc, at least you (and Steve) have all winter to sort that mess out.
Keep us posted.

Chris

Posted: Fri Nov 14, 2014 7:21 am

krgood0 wrote:

Ouch..... not seen that before, especially as the bearing outer has a locating dowel to locate it and stop it spinning

Still lucky it happened now at the end of the riding season and not in the spring

Keith

WOW I also have not seen this. How did you get bearing cap come out with the pin in????

I left one out and after putting the whole motor together I found it laying on the bench. Had to split the cases and clean all the 3 bond out and start over. Sometimes it aint no fun.

Have fun with it.

Peace, Jim

Posted: Fri Nov 14, 2014 3:17 pm

OH man Doc!! I'm sorry to hear Junior is ailing but he's in good hand. m

Posted: Fri Nov 14, 2014 6:52 pm

When SteveG and I were taking it out / apart he offered the opinion I left the pin out....Now I not saying 100% that didn't happen but after doing about 10 of these motors in the last few years I sincerely doubt it.....I always look for the engagement of the pin in the hole on the bearing cup. A little background on this particular motor here is warranted. This 1100 motor is a combination of several different bit's laying around. The cases came from one source the crank / rods from another and the cylinders, head, transmission ect...came from a motor that ate a rod bearing badly. I have the cases from the motor that ate the rod bearing and they are usable and a fully assembled 750 motor with trans in it (I know the 1100 gears are different but I hope to use the countershaft and bearings.) Partszilla says the countershaft is different between the 750 & 1100 but is it really?

CB1100F Joined: Jun 18, 2006 Posts: 2526 Location: UK

Hi

I always use this to cross ref. part #'s

http://www.ronnies.com/micro.htm

Keith

Posted: Sat Mar 07, 2015 7:31 pm

The motor is back together and in the bike...Start up will be an evening next week....Hooray.

Thanks to SteveG for the teardown and reassembly help, Grump for the transmission and primary shaft and Phil for the oil pump gasket. The rest was laying around.

The old cases were destroyed...The consensus is I left the locator pin out of the case on the blind end of the transmission countershaft......

The replacement cases had crack over the top of the clutch which I had welded (professionally.)

Part of the damage was the back of the clutch basket and the primary gear dampener....

One of Grumps part...

The motor was painted with Urethane paint and the power coated covers were installed..

A little effort and Voila!

Posted: Sun Mar 08, 2015 2:24 pm

That looks like a clever application of using ratcheting straps and a beam to allow you to slide that engine into place....Did that allow you to do the job by yourself?

Posted: Sun Mar 08, 2015 4:19 pm

f4fast wrote:

That looks like a clever application of using ratcheting straps and a beam to allow you to slide that engine into place....Did that allow you to do the job by yourself?

Made me go look - in a billion years, I would have never thought of installing an engine that way. I just stuff 'em in there with DennisPower and scratch the living beejeezus out of everything and curse a lot.

Posted: Mon Mar 09, 2015 1:35 am

I've heard of that beam and strap, read about it here on the forum before, maybe it was you. How does it work out?

Posted: Mon Mar 09, 2015 2:30 am

It never ceases to amaze me how you guys go at it and bum rush the repairs that you do!
Big fat Hell Yeah to your drive and perseverance....!!!!!

Way to be!
Jebby

Posted: Mon Mar 09, 2015 10:36 am

I have previously used the strap a 2 x 4 across the back of the motor and call a buddy (SteveG and buddy Dave both volunteered to help) method. This time I was being stubborn and wanted to do it myself. This was slightly trickier since Junior has a welded in right frame section. The key was the "curb shopped" section of steel tube that was part of a home gum system before being repurposed. The powder coated white tube slid easily down the big straps and having the bike on the lift allowed infinite up and down / fore and aft adjustments. This should be the last hurrah for one of these removal / install since I am in the process of building an adjustable motor lift for removing these bike motors. I will post images when that is done!