394, Round #2

[Fruecrue]

How’d they pull that seal so damn clean?

 

[RIDE-RED 350r]

How’d they pull that seal so damn clean?

That, I'm not sure of. Is there a trick little factory special tool that does that?

 

[Fruecrue]

That, I'm not sure of. Is there a trick little factory special tool that does that?

If so, I need one.
I usually destroy the seal and half of the garage.

 

[srcarr52]

That, I'm not sure of. Is there a trick little factory special tool that does that?

With all their trick tools they still tell you the bearings shot when it’s not.

 

[Deets066]

If so, I need one.
I usually destroy the seal and half of the garage.

Me and crank seals don’t see eye to eye either

 

[MustangMike]

Maybe I'm just lazy, but I would flush that bearing with some oil and see if it smooths out and determine why the saw did not start before I ripped it all down.

The bearing may not be the problem. I have very little faith (do to too much experience with them) with the analysis of the saw shops.

Bought 4 dead saws from a shop once, they told me what was wrong with each one. They were only correct on one of them! (The one with the burned piston, and I think they did it after the guy paid to have the saw tuned … all new tune up parts and the Hi screw was set 1/4 turn out). On a MS 440, the diagram for setting the low screw 1/4 out is right above the Hi adjustment screw. I think a new helper screwed up!

 

[PA Dan]

That, I'm not sure of. Is there a trick little factory special tool that does that?

Yes and it's a Stihl and no you dont want to know the price! [emoji16]

 

[PA Dan]

Here ya go! If a modified screw driver doesnt work for you here's your tool!

https://www.ebay.com/p/STIHL-OEM-Sp...4%26rvr_ts%3D7cd7a2511670aa661ce7268fffe3edf6

 

[dustinwilt68]

Yep @rattler has that tool, he loves it, I just use a tuning screwdriver with a notch in the side.runins the seal everytime but I am generally replacing them anyways, if for nothing else, for peace of mind.

 

[PA Dan]

Exactly! Ya Glock has that tool and it works very nicely. I'll have both seals out with my screw driver before the tool gets set up on the first one. If I'm taking them out they dont go back in!

 

[RIDE-RED 350r]

Well it's down to the bare bottom end. She's coming apart today.

 

[dustinwilt68]

For the cost of new bearings I would replace them.

 

[Fruecrue]

Here ya go! If a modified screw driver doesnt work for you here's your tool!

https://www.ebay.com/p/STIHL-OEM-Specialty-Tool-5910-890-4400-Oil-Seal-Extractor-Puller-Many-Models/2256005160?iid=352169978907&chn=ps&ul_ref=https%3A%2F%2Frover.ebay.com%2Frover%2F1%2F711-117182-37290-0%2F2%3Fmpre%3Dhttps%253A%252F%252Fwww.ebay.com%252Fp%252FSTIHL-OEM-Specialty-Tool-5910-890-4400-Oil-Seal-Extractor-Puller-Many-Models%252F2256005160%253Fiid%253D352169978907%2526chn%253Dps%26itemid%3D352169978907%26targetid%3D477790133025%26device%3Dm%26adtype%3Dpla%26googleloc%3D9005898%26poi%3D%26campaignid%3D1591255870%26adgroupid%3D62826452791%26rlsatarget%3Dpla-477790133025%26abcId%3D1139306%26merchantid%3D7867964%26gclid%3DCj0KCQiA6JjgBRDbARIsANfu58GV8uyfZKiBFbYfF0g1wUBmy1T6xLNcED8mayTPWQKJuBayo7NxEPYaAuVsEALw_wcB%26srcrot%3D711-117182-37290-0%26rvr_id%3D1769421692824%26rvr_ts%3D7cd7a2511670aa661ce7268fffe3edf6

Too rich for my blood.
I’ll keep fighting outside my weight class.

 

[RIDE-RED 350r]

So I popped the flywheel and found the seal in two pieces. Not the rubber, but the steel outer housing of the seal. Would this be due to incorrect assembly?? Like maybe the seal was not seated deep enough and the flywheel hub was rubbing on it?? This was my first rebuild that went this deep and I'm fully prepared to accept a mistake on my part.

The more I look at this the more I think the seal wasn't seated quite deep enough and the flywheel was rubbing it.

And I will be putting new bearings in along with the seals. It's not my saw and I want to make sure it's good. I still don't like the looks of that PTO side bearing. Looks like it got pretty hot

 

[Fruecrue]

Pics of back of flywheel?

 

[redline4]

Is that the outer part of the seal there?

 

[RIDE-RED 350r]

And now I'm convinced it was a mistake on my part. I can see the wear pattern on the seal housing. I didn't drive the seal deep enough.

 

[RIDE-RED 350r]

Is that the outer part of the seal there?
View attachment 153334

Yes it is

 

[RIDE-RED 350r]

Flywheel. I believe it was rubbing on that hub protrusion.

 

[RIDE-RED 350r]

Anybody have a measurement for seal depth off the top of their head?