Husqvarna 371xp Big bore rebuild

[Scott371xp]

Hey guys, I am brand new to this site and looking for some guidance on a new project of mine. I have an old 371xp husqvarna that cut it's last log. I purchased a big bore kit from huztl and currently in the process of rebuilding. I have the crank together but the crankshaft seems really tight. Is this normal? Should I restart before going further?

 

[idiotwithasaw]

Welcome to the site!!!

 

[idiotwithasaw]

If the big end bearing is stiff I would say you should look for a new or good used one. Good luck with your build.

 

[rattler362]

If you have split the case for new beatings my guess would be need to take a brass hammer and center the crank. if you haven't split the case you need to look it over good new seals will make it stiff too hope this helps.

Mike

 

[idiotwithasaw]

+1^^^ rattled362 is right. I misread your original post, you need to tap the shaft ends with a brass hammer to center it in the case, don't forget to put the nut back on the flywheel side to prevent messing up your threads.

 

[Scott371xp]

Thanks for the quick reply guys! New seals and bearings are in. Although it does look like the crankshaft is offset to one side. I was thinking of hammering it to center but wasn't about hammering on the crank. I will give the brass hammer a shot although the bearings are really tight on the crankshaft...

 

[idiotwithasaw]

It doesnt take a lot. Just tap it a little on each side till it frees up. How did you reassemble the case?

 

[idiotwithasaw]

Afleetcommand on YouTube has some great videos on these series of saws, very informative and helpful to someone working on one of these saws.

 

[Scott371xp]

I heated up the crankcase halves and put the bearings in the freezer. They went in relatively easily then repeated the process with the crank. I realize now that the bearings should of went on the shaft first. But I got it together.

 

[rattler362]

That is the same way I put mine together

Sent from my XT1060 using Tapatalk

 

[Scott371xp]

Ok sounds like I am on the right track then! Thanks.

 

[idiotwithasaw]

I heated up the crankcase halves and put the bearings in the freezer. They went in relatively easily then repeated the process with the crank. I realize now that the bearings should of went on the shaft first. But I got it together.

that's also the way I did mine, however I did put mine on the shaft first, others on here would tell you yours was the correct way to put it together.

 

[blsnelling]

The crank should be centered before the seals are installed. With them installed, there's no way to know when all side load has been removed from the bearings.

 

[Landmark]

Also have you ckd squish and timing numbers on the bb cylinder. I recently purchased a hyway bb kit for a 371 and squish and numbers had to be addressed as they were off.

 

[Scott371xp]

What do you mean by squish and timing numbers?

 

[idiotwithasaw]

Squish is basically the space between the top of the piston and the top of the cylinder at top dead center.

 

[Scott371xp]

Ok thanks guys. Everything is going good so far just a little confused about how the oil pump bushing assembles on the crank. I am not sure if I am missing something. Could someone provide some info on this assembly and how this end of the crank is sealed ?

 

[idiotwithasaw]

There is a really small o ring that goes on the crank between the bushing and the crank. You will have to get it from your dealer.

 

[Scott371xp]

The bushing has a shoulder on it. Does that shoulder go in first or facing out?

 

[pro94lt]

What's wrong with the oem jug?