Attempting my very first F#@$%@ng seal replacement 385xp , need advice!

[Gord404]

Done lots of them and have found a lot of the older ones don't fit tight on the crank- factory flaw- and in that case I replace the crank with a known good one around the shop and a lot of people won't agee with this but NWP makes a good crank- for the price of that bearing I usually replace it anyway and flywheel side with skf 6203 c3 and when putting that seal in I usually use a step to put that one in and out side a little coating of red loctite- great learning experiance eh - 390 an 385 are the same cases etc

 

[Chevboy0167]

https://www.mymowerparts.com/pdf/Husqvarna-Service-Repair-Manuals/W0101003.pdf

 

[david newbie]

https://www.mymowerparts.com/pdf/Husqvarna-Service-Repair-Manuals/W0101003.pdf

thank you! Hope to have it memorized by tomorrow

 

[J D]

Done lots of them and have found a lot of the older ones don't fit tight on the crank- factory flaw- and in that case I replace the crank with a known good one around the shop and a lot of people won't agee with this but NWP makes a good crank- for the price of that bearing I usually replace it anyway and flywheel side with skf 6203 c3 and when putting that seal in I usually use a step to put that one in and out side a little coating of red loctite- great learning experiance eh - 390 an 385 are the same cases etc

I haven't tried it myself, but I've been told you can knurl or make a bunch of punch marks on the crank so the bearing has something to interference fit onto & then install it with bearing retaining compound to help lock it in place & ensure it doesn't leak

 

[david newbie]

My PtO side seal arrived today (35$ shipped!!). A mechanic ive used mentioned that there might also be an O ring in there that needs replacing as well. Not sure if that's correct? Any thoughts? Also, this will be my first seal installation. Grease it and tap it in with a socket?

 

[Bob Hedgecutter]

Well, at least you have the bonus of not having to guide the inner lip of the seal over a step in the crank!
New one looks way nicer than the old.

 

[david newbie]

Well, at least you have the bonus of not having to guide the inner lip of the seal over a step in the crank!
New one looks way nicer than the old.

I was thinking I could save money and reuse the old one

 

[Bob Hedgecutter]

I was thinking I could save money and reuse the old one

Frame the old one with the caption of "my first" and the date.

 

[Chevboy0167]

 

[J D]

Interesting that they don't say they suit the 390... wonder if that means they only work on the earliest 385's? Not sure what exactly changed with the later saws but I thought the bearings & seals were the same throughout

 

[Gord404]

Well, at least you have the bonus of not having to guide the inner lip of the seal over a step in the crank!
New one looks way nicer than the old.

there is a step- 372 doesn't

 

[Gord404]

Interesting that they don't say they suit the 390... wonder if that means they only work on the earliest 385's? Not sure what exactly changed with the later saws but I thought the bearings & seals were the same throughout

no change - same case same seal- a 390 is just a 385 with a bigger bore - rebuilt loads of them' popular saw in my area

 

[david newbie]

Any thoughts on o ring? Do the early 385s have an o ring in addition to the seal?

 

[RedneckChainsawRepair]

Any thoughts on o ring? Do the early 385s have an o ring in addition to the seal?

I dont recall any o-ring on a 385-390.

Only on a 372 362 371 365.

 

[Gord404]

Any thoughts on o ring? Do the early 385s have an o ring in addition to the seal?

no- the 372 does in the clutch side but not the the 385 and to put your seale bearing in I think you need some guidance

 

[david newbie]

no- the 372 does in the clutch side but not the the 385 and to put your seale bearing in I think you need some guidance

Do you mean the pto side seal? I was picturing applying a little grease oil 2 stroke oil to both surfaces and carefully tapping it in with a tall socket?

 

[Lightning Performance]

I don’t believe that’s the case. I’ve rebuilt lots of them. The flywheel side uses a standard bearing and a metal/rubber seal that we see on most chainsaws. The PTO side always has a heavy duty sealed bearing. And they are typically only available at the dealer for about $40 apiece

Send me the bearing spec to see about a replacement quality bearing/seal. Something may be available.

 

[Lightning Performance]

Splitting it is only half the battle…gotta get it back together

That's the easy part

 

[huskihl]

Send me the bearing spec to see about a replacement quality bearing/seal. Something may be available.

I don’t have any more bearing specs than you do, Ken.

The saws have been out for 20+ years. I’d think if there was a workaround we’d know about it by now

 

[Bob Hedgecutter]

there is a step- 372 doesn't

Um- are you keeping up?
This is NOT a regular stock standard seal- it does NOT seal on the crank- nor on the bearing pocket- this seal fits between inner and outer bearing race- miles larger ID than the crank stub- so no step to work over.