• 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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    Thanks for your patience and support!

74 Mag 250 shifter shaft seal

mci-owner

mci-owner

Husqvarna
AA Class
Can any one give me some help, I trying to install a new 17x28x6 oil seal into the clutch side cover for the shiftier shaft. I have tried a clamp to force it, but just dose not seem to be the right size. All parts list show this size to be correct, just looks too big to into the opening. I have put plenty of seals in and never had one this tight. I thought of heating the side cover but would have to get to 300 degrees to help and that would damage the seal I'm guessing.

Any thoughts
 
17x28 seems right, can you measure the hole size and the OD of the seal to see which one is off? Does the seal have the dimensions printed on it?
 
The hole size in the sidecover measures 27mm in diameter. The 28mm seal measures 28.2mm which makes sence for a tight fit in a 28mm opening. I found a 27mm seal online and I am waiting for that to arrive. Yes the seal is marked corectly.:banghead:

Thanks
 
Not sure why more people have not come across this issue, as a leaking oil seal on the shifter seems like a common fix.
 
Hmmm, I get exactly 28mm in the hole and 28.1 on the rubber seal. the metal rim seal was 28 exactly. 1mm difference is huge are you sure there isn't something leftover in the case? The case I checked was 75/76, but I'm pretty sure the seal is the same. I'll dig out one of the two mags this afternoon and try to get a measurement.
 
The bike is a 250 Mag mounted to a six speed tranny, oem was a 4 speed, I even took a dremel tool and slightly eased the lip of the opening to help the seal get started. No luck. I will post a pic.

Thanks Hans
 
OK, I think I see it, your clutch cover is 75 or later modified to use the lower shifter boss. I uploaded a pix of my cover, notice there's no upper shifter boss. I'm pretty sure the lower hole was cut by someone after the fact (to 27mm), and the upper one plugged. I measured this one and it's a 28mm hole as well.

IMG_0764.jpg
 
The upper boss has not been altered, from inside you can see that, original casting. But I know what you mean, I remember seeing linkage on some of the parts diagrams. Hopefully the 27mm dia. seal will do the trick. I'm going to have to look up the case number and see what this motor originally was.
Thanks for all your help. How's the weather in Alberta, been very cold here in Pittsburgh.
 
She's a balmy -16C today, that polar vortex really seems to be wreaking havoc down south. It's possible your cover is off a really late '75 wr and they ran out of the older castings...it would be an easy way to keep making them. I have to say I've never seen that before...but that doesn't mean they didn't do it!
 
Yea it's in the shop, it was a metal edge seal, pretty beat up around the edges, I took a second look at the inside of the cover and you may have something about the cover being from a diferent model originally, Ill post some pics of the inside tomorrow.
 
Ok so I think I solved it. The case number is a #2042 which makes it a 1975 250 GP case. Those were the same side case as used on the 360. The 360 used the shift linkage and the 250 XC and GP had a 6 speed trany and did not use the linkage, but a direct shift shaft. So depending in witch motor the cover was used on, they machined the cover to mate to that motor. Still cant figure why my case has a 27mm seal size?oil seal 006.jpgoil seal 007.jpgoil seal 009.jpg
 
All the 75 models except the wr250 used the linkage, as any bike with laid down shocks had the foot pegs raised and the motor lowered. The wr250 used the MK frame which needs the lower shifter shaft. Is there a threaded hole for the set screw that holds the upper shaft? it should be pointing straight forward from outside the case..
 
Yes there is a sloted screw that faces the rear that would hold a shaft , it would be the Three o'clock position as viewed from the outside.
 
Well the 27mm seal arrived and went in as it should, no problems. Replaced gasket and oil all seems good, no more dripping oil on the floor.
Hans, thanks for your help and interest in solving issues.
It's much appreciated.
 
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