• Husqvarna Motorcycles Made In Sweden - About 1988 and older

  • Hi everyone,

    As you all know, Coffee (Dean) passed away a couple of years ago. I am Dean's ex-wife's husband and happen to have spent my career in tech. Over the years, I occasionally helped Dean with various tech issues.

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Tight crankcase housing

M

Martint93

Husqvarna
AA Class
Hello, anyone out there ever measured the crank bearing housing in their cases?
I think I am struggeling with too tight holes. After splitting the engine due to low end bearing failure (thanks Andy Elliot for a new rod kit) I found the crank bearing broken after 2.5 hours running time!

I measured my cases to 0.055mm under zero and the bearings at 0.005mm under zero.
0.0022in and 0.00022in.
This gives 0.05mm press fit for the bearings. I think that is too tight. The bearings where not turning easily around, but where fine when taken out.

I would say 0.02 - 0.03mm press.. For inches, devide millimeters by 25.4

This is by the way the liquid cooled cases 84-88 400-500cc

- Martin
 
Just curious did you press the bearings in or drop them in. When you heat the cases and then refrigerate the bearing they just almost drop in.

No blame here just want to know to help out.
 
GaryM said:
Just curious did you press the bearings in or drop them in. When you heat the cases and then refrigerate the bearing they just almost drop in.

No blame here just want to know to help out.
Click to expand...
I'd agree with Gary on this procedure, also .0002-.0007 press sounds right
 
Are You aware that un like most makes the Husqvarna's are tight enough that You are supposed to use a special puller to assemble the Main Cases ? This is probably a really stupid answer if You already are aware of this but I thought I would bring it up. What do You mean by Crank Bearing Broken ? The Balls were worn out, the Race was Cracked or ? Its not all that unusual for a bearing to fail right away, there are many reasons why it could of.
 
If your bearing bores are too small,I would think it would had been discovered at the factory when the motor was first being assembled.Bores don't get smaller over years.
 
1982 XC 430 said:
Are You aware that un like most makes the Husqvarna's are tight enough that You are supposed to use a special puller to assemble the Main Cases ? This is probably a really stupid answer if You already are aware of this but I thought I would bring it up. What do You mean by Crank Bearing Broken ? The Balls were worn out, the Race was Cracked or ? Its not all that unusual for a bearing to fail right away, there are many reasons why it could of.
Click to expand...
The right hand bearing would not spinn freely, was s little hard and felt like it had some metal particles in it..
 
Martint93 said:
The right hand bearing would not spinn freely, was s little hard and felt like it had some metal particles in it..
Click to expand...
So it sounds like it has contamination in it now, and one can't help but think that something got into it shortly after start up. I don't think there is going to be a smoking gun to be found.
 
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