390xp Project

[juttree]

A few days ago I picked up a 390xp from Craig's list for $200, it was beat to hell but I still figured it was a good deal. It also came with a 24" bar and chain which was in rough shape but definitely has a lot more life left in it. My plan was to buy the saw and possibly flip it but I'll probably just end up keeping it because I'm a saw whore.
Anyway, I thought I'd do a thread on the repairs.
Here it is right after I bought it.

After blowing it off as best as I could.

 

[Wagnerwerks]

Hot water and some degreaser and that thing will be transformed...
<~~~~~~ watching

 

[juttree]

I thought I would start with the plastics so I wet sanded with 400 up to 2000 grit sandpaper. Honestly though, I really don't have a lot of patience for stuff like this so I didn't spend a lot of time on it. As you can see, the plastics had a few good dings and dents in them but they came out ok.

After washingAfter sandingAfter a quick polish

 

[juttree]

Recoil was only washed

 

[MnSam]

That cylinder looks kind of toasty, interested to see how the p/c look. Plastics are looking good.

 

[juttree]

As for the motor, the saw has 140 on the gauge and the piston and cylinder look good through the exhaust and intake. The initial plan is to put new rings, seals, and lines in BUT this is what I found.Looks like I'll be adding a piston to the list. Luckily the cylinder is fine except for the squish band and one little spot that will easily clean up.

 

[juttree]

Sorry about the doubles.

 

[drf255]

What broke loose and dented that piston?

 

[gunnusmc03]

Looks like maybe a roller bearing. Check your crank over really well.

 

[SCTREEGUY]

My 372 gave up 2 weeks ago and looks sort of like this 1 thru the exhaust. Just curious how would a bearing from the crank end up in the top end?

 

[rattler362]

I got one in the shop a 385 gonna have to replace the crank big end rod bearing shot.

 

[gunnusmc03]

Sometimes when the needles let go they bounce around in the bottom end until they get into the transfers and then get shot up to the top and then pulverized.

 

[juttree]

What broke loose and dented that piston?

That's what I want to know too, everything is solid, smooth, and intact. Clips, clip ears, needle bearings, rings, ring pins, and crank bearings are all there and smooth as butter. I think something came in rather than let loose. The top ring is stuck at the exhaust side from the beating too. All the bearings have plenty of mix on them and I have not had this saw running yet. He told me he would start it up for me but I had my 4yr old daughter with me and she gets scared when saws are running, plus by the looks of it I wanted to check it out before running it any more. After I pull the seals I'll flush it out real good. One scenario I was thinking was, the muffler has a massive dent in the front of it and during that incident something came in. If you look at the muffler, there's a break around the tube for the muffler bolts so maybe a little piece of muffler got knocked loose and into the cylinder.

 

[wigglesworth]

Just a word of advise from somebody who's been there...

If u don't split that bottom end, and really inspect it, my hunch is your doomed to repeat that piston damage. You can do bearings, seals and gaskets in a husky for less than $35 bucks or so.

Well worth the investment.

And inspect that big end bearing really, really good. Make sure there's no chips flying off the bearing cage.

 

[mdavlee]

Just a word of advise from somebody who's been there...

If u don't split that bottom end, and really inspect it, my hunch is your doomed to repeat that piston damage. You can do bearings, seals and gaskets in a husky for less than $35 bucks or so.

Well worth the investment.

And inspect that big end bearing really, really good. Make sure there's no chips flying off the bearing cage.

Can't do it quite that cheap with that $40 PTO side bearing/seal combo but it would be worth splitting to check it out.

 

[juttree]

Just a word of advise from somebody who's been there...

If u don't split that bottom end, and really inspect it, my hunch is your doomed to repeat that piston damage. You can do bearings, seals and gaskets in a husky for less than $35 bucks or so.

Well worth the investment.

And inspect that big end bearing really, really good. Make sure there's no chips flying off the bearing cage.

Thanks for the advice. Are you talking OEM?

 

[wigglesworth]

Can't do it quite that cheap with that $40 PTO side bearing/seal combo but it would be worth splitting to check it out.

Yep. Forgot about that. Stoopid design IMHO.

"Most" huskys are cheaper to split than Stihl™

 

[wigglesworth]

Thanks for the advice. Are you talking OEM?

Yes. A 372 I can redo the bottom end for about that. However, the 390, like mike said, has a goody PTO side bearing/seal setup.

 

[juttree]

I don't mind splitting it for the piece of mind but I'd be willing to bet that the bottom end is fine. There's no marks whatsoever in the crankcase, I know that doesn't guarantee anything but it sure doesn't seem as though anything came from down there.

 

[Mattyo]

husqvarna 385xp build - bearings and machining:

This is my 385xp build. ...might help