Husqvarna 576 XP Top End Rebuild, Step by Step

[Onan18]

Have a 576 on the bench for a new top end, Tree service let the 300 pound gorilla service it and he pulled the plug threads right out of the cylinder. Though I would take a chance to document the process. I realize for many of you this is old hat and will be boring but for the newer guys hopefully it will save some frustration.

Step 1: Clean the dang saw!



New parts



Here is what the Intake setup looks like

 

[Onan18]

Pull back on the throttle shaft to release the cable


Slide cable out of holder


Disconnect the kill wire, just slides off


Now disconnect the ground strap


Four bolts hold the carb in, you will need a 4mm Allen, remove them and pop the two tabs out of the rubber vibration dampeners

 

[Jimmy in NC]

Full rebuild for putting a spark plug insert in? I'm confused... if just doing a top end ditch the base gasket and thank me later. Loved the 576xp I had.. tree service liked it more than I and now runs it over his MS 440

 

[Onan18]

Carb and filter holder lift out as an assembly


Four more screws for the cylinder, again you need a 4mm Allen


And off


Here is what the old piston looked like

 

[Onan18]

Full rebuild for putting a spark plug insert in? I'm confused... if just doing a top end ditch the base gasket and thank me later. Loved the 576xp I had.. tree service liked it more than I and now runs it over his MS 440

Top end only, as a dealer I cannot put a thread repair in the jug because I have to guarantee it, so new top end.

 

[Onan18]

Three screws and the pulse line are all that hold the manifold assembly on


Again, 4mm Allen


Best tool for getting the decompression valve out is a bar wrench


In the new cylinder


Manifold installed

 

[Duce]

I know you are not doing bearings, but if you replace clutch side crank bearing, do you use sleeve retainer? Have replaced a couple on 576's that seem to spin that bearing.

 

[Onan18]

AV mount was broken, replacing it while apart, you guessed it, 4mm allen


New piston fitted


Compress the rings and slide the jug down


Make sure that the pulse line is snapped in


And that the expander ring is in place

 

[Onan18]

I know you are not doing bearings, but if you replace clutch side crank bearing, do you use sleeve retainer? Have replaced a couple on 576's that seem to spin that bearing.

Yes, Loctite sleeve retainer

 

[Onan18]

Snug the bolts down and then tighten in a X pattern


Slide the carb and filter holder back in as an assembly, make sure that the choke lever is seated in the groove


Reconnect wires and cables


Dust boot in and the job is essentially done


Hope this was informative.

Joe

 

[dall]

maybe a impact was used to do the plug ?

 

[angelo c]

Makes me thankful the MS460 on my bench is ahead of the 576xp.....did I mention the 576 has been on the bench for months....
this post confirms why...

Thanks Joe for reminding me.

 

[Onan18]

Courtesy shot of it back together.


Joe

 

[dall]

does it run ?

 

[Onan18]

No.

 

[Deets066]

No.

Why not?

 

[dall]

No.

why you hitting me for ? lol

 

[Onan18]

Why not?

Because some know nothing hack of a mechanic worked on it, that's why.

 

[Onan18]

Why not?

Just cutting up with dall, she lit right off and ran well.

 

[Onan18]

I picked up another 576 last week that needs a new top end as well, is there anything that someone would like covered in more detail?