1987 CR 250 waterpump shaft

ZOOK250
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ZOOK250
Edited Date/Time 5/12/2017 3:38pm
hi Guys, looks like i have a waterpump leak. the right side case is like new. completely rebuilt the engine last season , all new seals included.

my engine guy is suspecting a worn impeller shaft. i think maybe the seal is installed backwards (ive heard this from other posts). the leak is coming from the bottom weep hole.

would anyone have a extra water pump shaft for sale? the attached fiche is for an 87' the picture is one out of an old 86' that i have laying around.

thanks
curt



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Sofiedog
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Sofiedog 5/11/2017 7:08am
5/11/2017 7:08am Edited Date/Time 5/11/2017 7:18am
Have you actually looked at the condition of the '87 shaft? There are other leak paths. I think that is one of the years that has the magnesium alloy side cover? What condition is it in?
On my '83, I left off that #18 flat washer behind the impeller. The cap nut, #15, couldnt tighten down on the sealing washer, #16. That caused a small drip through the weep hole.
From what I remember, the oil seal rides on the shaft diameter, not the water seal. But, mines a little different.
ZOOK250
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ZOOK250 5/11/2017 8:43am
5/11/2017 8:43am
the cover is in great shape. i will let my guy know about the other possibilities.

thanks Sofiedog.
Sofiedog
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Sofiedog 5/11/2017 3:51pm
5/11/2017 3:51pm
Good luck! Here's what I found when I opened up my '83!



450exc115
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450exc115 5/11/2017 5:06pm
5/11/2017 5:06pm
Always sand shafts before installing with new seals to give them a fresh surface to seal against. Start with something​ in the 200-300 range for badly used shafts a 600+ for good looking shafts.

Good luck!

The Shop

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ZOOK250
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ZOOK250 5/12/2017 5:42am
5/12/2017 5:42am
yikes that looks pretty bad, my engine sat in a crate for about 20years with no coolant in it. it is in "like new"condition. i have still been thinking of getting the 88-89 aluminum case, maybe later this season. the shaft is shot, dealler says there are 3 in stock for 78.00. so off to the honda shop this morning.
Sofiedog
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Sofiedog 5/12/2017 3:37pm
5/12/2017 3:37pm
Can also switch to Evans waterless coolant...that's what I'm doing...here's the between pic with the corrosion cleaned out and final pic with JB Weld applied, cured, and sanded. It seems to be holding up...no leaks... When I cleaned out the corrosion, there was a hole in the case between the water pump side and the oil side. Only a layer of corrosion was preventing a leak.

finished!


Sofiedog
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Sofiedog 5/12/2017 3:38pm
5/12/2017 3:38pm
ZOOK250 wrote:
yikes that looks pretty bad, my engine sat in a crate for about 20years with no coolant in it. it is in "like new"condition. i have...
yikes that looks pretty bad, my engine sat in a crate for about 20years with no coolant in it. it is in "like new"condition. i have still been thinking of getting the 88-89 aluminum case, maybe later this season. the shaft is shot, dealler says there are 3 in stock for 78.00. so off to the honda shop this morning.
That's a bargain.

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