SR2 starter replacement

[KC7NOA]

I'm past the sprocket and sheave, ... bought a replacement sheave.

I'm trying to find a replacement for the nut ... maybe a 1-3/8 18 ... took it to a generator shop in town ... they said they didn't have one to replace it.

[cobbadog]

Try the local bearing shop as it is part of a bearing adjuster. Or have a look online at some nut and bolt shops, you never know what will turn up.

[KC7NOA]

Sandblasted

[KC7NOA]

Looks like I'm ready to freeze the shaft and bake the bearing to get a slip on install of the bearing

[cobbadog]

What way are you intending to freeze the shaft and warm the bearing? On a small shaft I was able to put it in a plastic bag and hid it in the freezer inside overnight. Never got caught either. Then when it was time I was able to get enough heat from a heat gun for stripping paint. You don't need a huge variance but enough to do the job.

[KC7NOA]

My other knew what I was going to put in the deep freeze ...

Shaft hit 20deg and bearing was heated to 200 degrees in a shallow oil bath ... for a 180deg differential

Slid right on ... I even put the lock tab and nut quickly and tightened

[cobbadog]

Very well done, looking better all the time.

[Hugh Conway]

Re: cooling/heating to remove bearing from shaft.
In commercial aviation, we sometimes encountered a wheel bearing stuck on an axel (think big, like 747)
The solution was to pack the axel in dry ice, the bearing remained at ambient temp. the bearing usually just slid off.
Dry ice is not that difficult to come by, locally, it's used for packing fish for transport via courier (sport fishermen)
Cheers
Hugh

[cobbadog]

Good thinking Hugh. Our Club used a lot of dry ice to help shrink the cyliner liner in the Clubs big Tangye engine. Even then it was stubbourn but got it out in the end.

[KC7NOA]

I see why -- kinda -- why sprocket/sheave was installed backwards ...
Smarter to cut off the thin angle iron that holds the air cleaner

[KC7NOA]

Well, sheave is on in what I feel is the correct way ... im not sure if I have the belt too tight

https://youtu.be/rKwcno2wDkg

How much "shaking" can a generator take?

[cobbadog]

Answer, preferrably none.
So what is causing the vibration, engine or generator?
Disconnect the belt and see if the vibration is still there, if so you need to sort out the source of the vibration in the engine.
If there is next to no vibration then the generator is causing the problem and possibly destroy it. Possible cause would be a bent armature so if it is the generator slip that out and test it for being bent.

[KC7NOA]

Honestly, I'm thinking the frame is acting like a turning fork ... the fuel tank up on top


https://youtu.be/BiYeFpKCaw8

[oldgoat]

Doesn't look too bad in the video. If it is solid mounted to the fame you will certainly get some vibration from the Lister twins. The battery needs to be on rubber mounts or it will have a very short life.

[cobbadog]

It does look good and sound right too in the video. The suggestion of mounting the battery tray on rubber is an excellent idea as any vibration with shake the seperator plates inside to the bottom of the case and dead short.