water pump leaking

[Haser]

hi there

the other day i started my bike after almost month of being out and noticed significant leakage from cover drain hole in front of engine: coolant seeps while engine's still cold, then stops.

any idea what it might be? pump seal? cover's o-ring?

would appreciate,
=avz

[Reddevil76]

Re: water pump leaking

Originally posted by Haser
hi there

the other day i started my bike after almost month of being out and noticed significant leakage from cover drain hole in front of engine: coolant seeps while engine's still cold, then stops.

any idea what it might be? pump seal? cover's o-ring?

would appreciate,
=avz

Behind the water pump impeller, there are two seals. One which they call a mechanical seal, and one which they call the oil seal.

In between these two seals, is an air gap which leads to the weep hole.

If the mechanical seal fails, coolant will flow past it and come out from the weep hole.

If the oil seal fails, oil will flow past it and come out from the weep hole.

If both fails, both coolant and oil will mix in the engine and you will also see whitish oil coming out from the weep hole.

The weep hole is to help you diagnose which is failing.

However, it is advisable to change both while replacing the spoilt one. Also, remember to cover the impeller shaft with vinyl while replace back the crankcase cover.. left alone, its edges will hurt the seals.

[Seca]

This is an easy repair to do also. you can do it yourself and save some mone. Parts only should cost you about 10 bucks if I remember correctly.

[TLRguy]

ah yes, the water pump seal! I just finished this repair last week. It is an easy repair to do, just take your time and be careful with the rear clutch cover gasket. Pay close attention to the way the seals are placed in the impeller as well.

[TLSBill]

Re: Re: water pump leaking

Originally posted by Reddevil76
Behind the water pump impeller, there are two seals. One which they call a mechanical seal, and one which they call the oil seal.

In between these two seals, is an air gap which leads to the weep hole.

If the mechanical seal fails, coolant will flow past it and come out from the weep hole.

If the oil seal fails, oil will flow past it and come out from the weep hole.

If both fails, both coolant and oil will mix in the engine and you will also see whitish oil coming out from the weep hole.

The weep hole is to help you diagnose which is failing.

However, it is advisable to change both while replacing the spoilt one. Also, remember to cover the impeller shaft with vinyl while replace back the crankcase cover.. left alone, its edges will hurt the seals.

Someone should throw this in a "faq" in the help section or frequent mods or something.

Thanks for the info in a nice easy to understand format!

[Reddevil76]

Thanks Bill.. it's only natural that I'm familiar with this because my oil seal is failing!

Stripped my drain bolt and had to tap a new hole for an oversize screw. But there is a piece of metal very very close to the drain hole, called the oil separator. And worse is that it only clicks into place, not held by any screws.

Anyway, my tapping tool went in and pushed the bloody thing outta place, so I had to remove the clutch cover to use a rod to push it back.

Changed all gaskets while re-installing except the oil seal cos its outta stock. On top of that, i forgot to put vinyl on the impeller shaft.

Bad move.. oil now leaking and everyday I'm looking in the mailbox to see if the oil seal my US friend sent has arrived...

[Reddevil76]

Re: water pump leaking

Originally posted by Haser
hi there

the other day i started my bike after almost month of being out and noticed significant leakage from cover drain hole in front of engine: coolant seeps while engine's still cold, then stops.

any idea what it might be? pump seal? cover's o-ring?

would appreciate,
=avz

Btw, to repair it, you need to remove the clutch cover, which means you also need to get the gasket for it (11482-02F10) And to play safe, the water pump case O-ring, plus the 2 washers behind the impeller bolt. (See ron ayers microfiche)

You decide if you wanna change the oil seal as well, cos the shaft might also damage it while removing the clutch cover . The way I figure, I wouldn't save a couple of bucks only to find that I have to redo the whole thing again.. And another bag of gaskets and O-rings..

You while also find that you will need to use a scraper to carefully scrape off the old clutch cover gasket. Bits of it will stick to both mating edges. While re-installing, apply engine oil liberally to your new clutch cover gasket, this gives a better seal and also prevents it from sticking to the mating surfaces the next time you need to remove the cover (touchwood). So much so that you may even get to re-use it.

[TLRguy]

I just noticed that I'm having my leak again from the weep hole. I've never heard anything about the vinyl, do you glue it on or what? Anyway, I'm desperately waiting to see what the heck is going on as soon as the bike cools down.

[Reddevil76]

Originally posted by TLRguy
I just noticed that I'm having my leak again from the weep hole. I've never heard anything about the vinyl, do you glue it on or what? Anyway, I'm desperately waiting to see what the heck is going on as soon as the bike cools down.

Erm.. how should I put it.. first we must make sure we understand each other's interpretation of vinyl.

I referring to those vinyl wrapper used to wrap food that you wanna chuck in the fridge. They come in a roll.. I'm sure you can get some from the kitchen.

Just wrap some around the shaft, place the clutch cover back and you will see the shaft have to go through the two seals and come out the other side. Once you've place the cover back firmly, you can remove the vinyl. You need not glue it on. The idea is basically just to cover its edges while it is going through the seals when you are placing back the cover.

[TLstreak]

Seran wrap

[kevh]

heh that coulda been bad...having vinyl glued to the impeller shaft

[TLRguy]

Alright, don't I feel like the f*$#kin dumb ass!! I see what you're talking about now. I would of just said wrap the shaft to protect it from the edges when putting the impeller back on. YOu're right, interpretation is hard to get over the net.

[Haser]

Thanks for the info in a nice easy to understand format!

-- can't say better

however, i haven't gotten in why i need to remove the clutch cover? and more, tlr guys, are you sure your water pump is just the same as on tls?

thanx,
=avz

[Reddevil76]

Originally posted by Haser
-- can't say better

however, i haven't gotten in why i need to remove the clutch cover? and more, tlr guys, are you sure your water pump is just the same as on tls?

thanx,
=avz

Ok, I understand your confusion. Let's get to Ron Ayer's website, go to microfiche and click on crankcase cover. We usually refer to No. 7 as the clutch cover. But look at No. 1, it is also referred to as the clutch cover. But the lesser mentioned one.

It is No. 1, i'm referring to. Or rather, the right side crankcase cover.

[cmhspit]

Do you have the link to Ron AYers web sight?