Photos, because I am a sharer... and need some help...Graphic!!!

[rgranger]

I didn't know if this would go in photos, engine, chassis...
anyone have any tips on getting the rear motor mount/swing arm pivot out?

if i remove the pickup for the ignition, does it need to be retimed or does the pickup notched or something so that it goes back in the proper place?

I didn't pull off the side case, is that part of the power valve governor?

Graphic pictures, WARNING!!!

 

[Leo]

swing arm pivot extreme removing tip:

1) Bore the pivot hole (right side) to the next thread inside diameter that you have an tap.
2) Make the thread
3) Use one bolt to pull the pivot.

 

[rgranger]

Thanks leo, i unbolted the shock and that seemed to take enough load off for me to get some steel on it and punch it out. Took me forever to get the motor loose, kept hitting on something. finally have it about 1/3 of the way out of the frame and just waiting on some kind sole to come help me lift it out

The motor guy that Girard and another buddy suggested happens to be in Dallas, and I happen to be going there this weekend so I am hoping to get it boxed up so that I can drop it off monday.

 

[Jakobi]

Thats not a pretty site at all.. Makes me feel sad inside.

Swing arm pivots are a pain (especially if not done frequently). It took me 4 days of prenetrating oils, heat cycles, and a very large hammer to remove the one out of a yamaha. Persistance and patience is key. I do like Leo's idea though! Someone should start producing them!

I believe the flywheel and stator has a keyway and only goes on one way so no issues there.

How'd it happen? Was she running beautifully and then... ?

 

[GMP]

Thats why you anti seize when new.

Looks like a snapped impeller shaft and bearing that came apart. I'm curious, check the pump cover/impeller for contact.

This should go in the engine forum.

 

[rgranger]

You know they always run great right before they go kaboom! I was in some pretty tight technical stuff and heard one click like sound, came out of the woods up a rise of about 15 feet and stalled it at the top, when I restarted it started making a nasty racket so I pushed it the few hundred yards to the road.

Got the swingarm pin out, so I will put antiseize on all the pins when they go back together. I noticed that one of the mounts on the bottom had some white lithium on it.

 

[rgranger]

Glenn I will pull the cover when I get back in town Friday night and post the results. I am more than cool moving this to Engine now.

 

[GMP]

Thats for sure the impeller shaft, and almost certainly the inner shaft bearing. Now why did it break at this stage and what failed first? That shaft is very thin and weak in the pin area but it does not have to be strong to spin the impeller via the plastic gear. Either something jammed the impeller/gear or the bearing failed first, and the shaft was hit by the counterweight which is very close as you will see. It wouldn't take much as far as debri to jam that small bearing. This is not the first time this has happened. Next time I do a motor I think I'll spend top dollar on premium bearings here just in case, small and cheap anyway.

 

[Neil E.]

if i remove the pickup for the ignition, does it need to be retimed or does the pickup notched or something so that it goes back in the proper place?

The pickup has a shaped base that only mounts one way.

 

[rgranger]

Thanks Glenn and Neil:
I think that I will mention that to Andrew Cooksey. I had hoped to get the motor out and take a look behind the impeller cover, but spent way to much time on the swing arm pin. Now I am almost afraid to before it gets to Cooksey's place, don't need any more bad news today. Andrew said that he would keep me posted with email updates, if I can get him to send pictures i will follow up.
maybe the postmortem will help someone else.

 

[gasgasman]

Cooksey's "claim to fame" is taking pics as he goes along with the repairs.
You will have over 80 pics by the time he is done.

 

[rgranger]

Had the motor dropped at Cooksey's today. I am pretty sure I busted one of the mounts for the stator pickup, why the heck did they make those so tight and use phillips head screws? Allen, Torx, Hex, but for cripes sake, not freaking phillips head easy strip screws!!!

 

[TBUBBA]

Just curious...did you have the a plastic or metal impeller in there?

 

[rgranger]

I had that off for something else, oh, to check the adjustment on the power valve and I think that it was a white plastic impeller.

 

[rgranger]

It turns out that those of you thinking it was water pump related - you win!
the pin came out of the plastic gear and pretty much bounced around destroying things.

 

[rgranger]

Oh, it gets better...

apparently one of the ball bearings from the water pump found its way into the tranny and busted a few gears on the main shaft...

 

[GMP]

The shaft snapped at the pin hole, like we have seen before. Check the impeller and cover for evidence of contact, I'm very curious. Its very hard to diagnose this as the counterweight edge is very close and could hit and break the shaft if the bearing failed first.

 

[rgranger]

I sent andrew a note to see if he can take a look and report back. The bearing was just desintegrated. he found the bearing in the gearbox, i found part of the race wedged behind the clutchbasket, deforming it so that the fibers would not come off, really a mess!

 

[rgranger]

For Glenn: impeller cover

Thanks for the info today, Glenn!
Rob

 

[nambo-trev]

wow those pics look familiar these were my pics of my blow up with only 10hrs on my engine


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