044 rebuild

[Mastermind]

Are you sure that is an OEM worm gear? The reason I ask is that I've seen that with an AM gear before.

 

[Adirondackstihl]

The oil pump is the stop for the bearing. It can't physically be any closer than that. So, how can his bearing installation method have anything to do with this?

Are you sure that is an OEM worm gear? The reason I ask is that I've seen that with an AM gear before.

Someone get Brian over here......he can splain it better than me.

 

[NHRA1877]

I had bought a worm gear off eBay, that one mid have been I tiny bit too small, I stopped by the stihl dealer my friend works at and he grabbed a new worm gear off the shelf, it was tight when spinning it but seemed to loosen after a quick start up, could he have grabbed the wrong worm gear off the shelf and maybe it was just too long of a gear into the oil pump? I don't know if the worm part of it is standard depth or maybe the 044 one is shorter than others?

 

[NHRA1877]

Ok guys, so it has been 2 months since I last saw my 044, I love reading build threads so I wanted to finish this thread.

I last left off finally running my rebuilt 044, when running it I realized I had problems and didn't want to ruin all that I had just done so I sent it to one of the best out there, mastermind. As some had suspected the clutch side bearing was not seated correctly, maybe randy will chime in with specifics. He installed a new bearing and seal and of course did a full port job. The saw should be here in the next day or do and I can't wait to run her

 

[Mastermind]

Yeah........it's all squared away.

 

[Trx250r180]

Someone get Brian over here......he can splain it better than me.

Hi ,just saw this ,if you install the bearings in the case without seating them against the crank after ,or using bolting the oil pump before the bearing ,it is possible for the plastic drive gear to drag on the seal or bearing and melt apart like in the photo ,took me 3 drive gears to figure it out on one of my saws what was happening ,a tap on the oil pump side bearing with a socket will set the bearing closer to the crank where it needs to be ,then the oil pump drives will not melt ,this is a bearing that was melting oil drive gears ,it is out too far ,a couple taps to seat the bearing and no more melting

 

[Mastermind]

That's what this 044 was doing......

 

[NHRA1877]

I thought I had done it correctly, had the oil pump in and thought I had it seated against it, still not sure how it was out too far, all I know is I learned a lesson, I WILL be doing another set of bearings very shortly till I have the process down. Good thing is I now have a saw that should drop all of my friends jaws. This is the saw I will NOT sell! Another project will be coming shortly, not sure if I will do a build thread on it.

 

[Trx250r180]

That's what this 044 was doing......

see how the seal is not on the collar enough ?this bearing is too far out from being seated right ,a couple taps with a socket on the edge of the bearing knocks it back in where it should be ,then the plastic drive is happy again

I think what happens is when tap the case halves up against the crank during assembly ,the bearing has a chance of shifting at that time and moves a little

 

[mdavlee]

see how the seal is not on the collar enough ?this bearing is too far out from being seated right ,a couple taps with a socket on the edge of the bearing knocks it back in where it should be ,then the plastic drive is happy again

I think what happens is when tap the case halves up against the crank during assembly ,the bearing has a chance of shifting at that time and moves a little

I warm the bearing with a heat gun when I install the crank. When I put the 046 together the other day with a new case gasket I pushed the halves to within an 1/8" with my hands and pulled the rest in with the bolts. A couple taps with a brass drift on the clutch side and it spun nicely.

 

[redfin]

I'm a bit confused regarding your pump melting Brian. How is it possible for the bearing to be to far outboard if it is to be seated fully against the pump?

 

[Mastermind]

What happens is that the bearing moves a wee bit......either when pulling the case halves together, or when centering the crank after assembly.

We use a old broken oil pump that is gutted when we do case work. (we have some like that for most saws we do) That way it can stay on the case while everything is done, and the crank is centered, without worrying that we will bust it.

 

[juttree]

I'm a bit confused regarding your pump melting Brian. How is it possible for the bearing to be to far outboard if it is to be seated fully against the pump?

Is it possible that it slightly indented the underside of the pump?