Husqvarna 350/346 Repair Thread.

[Onan18]

Here we go again everyone, this thread will document the general repairs and some basic mods to the Husqvarna 340/345/350/351/353/346 chassis as well as their Jonsered counterparts. I have a few 350s in the que for re-seal and 346 cylinder conversion as well as my Dads 346 for seal replacement and an intake track upgrade; so I will be adding to this thread as they come up in the rotation.

On the bench is a 350, this saw came in for an erratic run issue characteristic of an air leak. It will be getting re-sealed as well as the intake clamp update, muffler support bracket added, carb kit, fuel line, etc...


The victim.

 

[Onan18]

Start by removing the top cover.


Clutch cover next.

On this chassis the adjuster pin and tensioner screw are one piece. It works but is hard to get a screwdriver on. A good upgrade is a clutch cover assembly from a 455/460. You have to remove the tensioner from the case but otherwise it is a direct swap.

 

[Onan18]

Air filter next, the 346 is held on with a retaining wire.

But on the other saws you just twist...And off it comes.

Little tip, use the top cover to hold your fasteners.

 

[Onan18]

Front handle next, three screws on the side.

And two on the bottom.

Bottom screws are shorter, don't mix them up!

Handle off.

 

[Onan18]

Brake flag next, one screw on the flywheel side...And another on the PTO side.

Screws have a shoulder for the flag to pivot on.

 

[Onan18]

Flag off.

Here is the detent...

It just pops out.

 

[psuiewalsh]

Should I call the number on the tag and tell him the saws done?

 

[Onan18]

Muffler next, two 4mm Allen's.

OEM mufflers have a part number stamped into them.

And off, here is the order things go onto the cylinder.

 

[Onan18]

Starter next, four screws.

Here is how the wires route.

Air deflector out.

 

[Onan18]

Kill wires next.

They come off like so...

Pull them through the case and get them out of the way.

Then the fuel line.

Disconnected.

 

[Onan18]

This small wire retains the throttle linkage.

Pop it out.

Depress the throttle.

Hold the throttle shaft open.

Release the trigger and the throttle linkage will come out of the catch.

 

[Onan18]

Lift the throttle rod and bellows out as an assembly.

There are two vibration dampeners that support the air filter base.

One here...

And one here.

Release them.

 

[Onan18]

There are two screws that hold the intake track on.

You guessed it, 4mm Allen.

Intake track comes off like this.

Release the choke lever.

And the carb comes out.

 

[Onan18]

Clutch next, the tool for this is really inexpensive.


But if you are in a hurry there are other ways.


Catch the clutch and give it a couple of good smacks.


And it will spin off.

 

[Onan18]

Clutch drum next.


Don't forget the needle bearing.


Wind the worm gear out.


You can see how the cutout in the worm matches the drum, this is how the oil pump is driven.


And this is as far as you have to go on this side.

 

[Onan18]

Loosen the flywheel nut and run it until it is flush with the end of the threads.


A couple of sharp taps on the nut and the flywheel comes off, the key is cast in so you cannot lose it.


You don't have to remove the coil for this job but if you do be sure not to lose track of the ground strap.


Remove the cylinder bolts.


And off.

 

[Onan18]

There are two flex limiters for the anti-vibe.


One here.


And one here.


The screws don't have threads on the end, they just push into the buffers.


Which rest in these pockets, with the screws out they will pull free.

 

[Onan18]

Fuel line routes through the case here.


Remove the front A/V mount retainer screw.


And the back one.


Uh-Oh.


That's not good.

 

[Onan18]

This is as far as I got today, I had to order a new A/V mount and I have a service school tomorrow. More to come soon...

 

[huskihl]

View attachment 100770
Fuel line routes through the case here.

View attachment 100771
Remove the front A/V mount retainer screw.

View attachment 100772
And the back one.

View attachment 100773
Uh-Oh.

View attachment 100774
That's not good.

I've seen a few 346's pull those threads out. Throttle is usually stuck about 1/2 open and inoperable. It's from getting the Bar pinched and yanking it out. Shove a piece of trimmer line in there and run the screw in. Or melt some trimmer line into the hole and re-drill it