Setting Bearing Depth

[Mattyo]

*************VERY FRUSTRATED********************

Ok, so i'm playing with the new go pro. used a whole battery taking footage that i'll likely toss.

I have a 440 farmertech crank off the case and one on the case.

Using the one off the case, bare crank, crank bushing, clutch washer, clutch, needle, washer ... there STILL isn't a lot of clearance.

The clutch washer is quite thin, but for sure it makes the difference between being clearanced and not.

OK, so what does this have to do with the bearing? If you push the bearing up against the oiler, and then leave only .033" gap between the lobe and the case boss, the crank is not fully seated in the bearing. ... making it definitely impossible to have enough clearance at the end of the crank, to accommodate an e clip.

I'll take some photos, but I gotta find someone else that can confirm this.... anyone got a 440 kit sitting around?

 

[Mattyo]

So, this seems fine. But if you notice, the crank bushing is fully up against the stop. If the crank is recessed at all in the bearing, it'll push the bushing further out, and the clutch will be further out, not allowing the e clip clearance.

This seems to argue toward seating the bearing fully on the crank FIRST. to heck with its position relative to the oiler. ...

i'll prove it .....

 

[Mattyo]

 

[Mattyo]

This is as far as I can get the crank to come into the bearing. It won't come flush.

The e clip is too tight. its just too tight. it won't go.

I think the solution is to take .020" off that crank bushing.

The bearing is flush with the oiler... seems like centering has gone out the window, BUT, also seems like there is a stop on the crank, so if you put the bearing against the oiler, and pull the crank tight, it won't rub the lobe against the boss.

 

[Adirondackstihl]

So.....the last 8 or 9 044's I built, I did them wrong?

 

[Mattyo]

I'm gonna measure that crank bushing, anyone got any oem one they can measure?

 

[Mattyo]

So.....the last 8 or 9 044's I built, I did them wrong?

I don't know... i doubt it. if you got the eclip to go smooth more power to ya.

somewhere there is an error....I've just spent HOURS looking for it....

 

[Adirondackstihl]

I don't know... i doubt it. if you got the eclip to go smooth more power to ya.

somewhere there is an error....I've just spent HOURS looking for it....

If it's a Chinese saw......look no further

 

[Mattyo]

ok, the AM crank bushing is .706" x .763" long

 

[Mattyo]

thats the dumb thing though, some of this stuff seems pretty accurate

gotta figure out where the inaccuracy comes in and weed that out....

 

[Mattyo]

 

[Mattyo]

So I noticed something..... stop me where I'm wrong here. The bearing, installed in the case, has a thicker inner race. likely same thickness as a 6202...

right now the crank bushing seats against the bearing....rather than against the crank... if the bearing was thinner... ????

i know i'm stretching things, but there has to be an answer here of where the error is.....

 

[Mattyo]

 

[Mattyo]

 

[Mattyo]

Ok, so I pressed a 6202 onto the bare crank, just for giggles. It has to be the same thickness as the 440 bearing inner race. Now you can see that the bushing seats not against the crank, but against the inner race, and the height of the bushing is nearly AT the clutch threads.

This bearing is on as far as it'll go.

 

[Mattyo]

btw, in case anyone is wondering, there is a little lip at the crank...preventing the bearing from hitting the lobe...its about .016" high.

 

[Wonkydonkey]

Being centered is over rated.

Is that the self centred type

 

[Mattyo]

ya, just like that, only different

 

[BuckthornBonnie]

Oem 1128s go together smoothly using the pump to seat the bearing and freeing the crank (if needed) with the pump in place.
The 044/440 sleeve does ride on the race and is torqued to spec by the clutch. I'm not a fan of this design but it's worked for many years.
So... maybe that china spacer is slightly long, or the AM bearings... is the clutch torqued close to spec, too? Case gasket seem right?

 

[BuckthornBonnie]

I'm betting spacer or maybe that run of pto bearings.