Water pump issue I need help with - Kawasaki KLR 650 Forum
1987 to 2007 Wrenching & Mods For maintaining, repair or modifications of Generation 1 KLR's. 2007 and earlier.

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post #1 of 6 Old 12-16-2018, 12:47 PM Thread Starter
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Water pump issue I need help with

Hi guys,

So I just buttoned the bike up after doing a thermo-bob and replacing the water pump seals and o-rings. I used the marknet directions and I was confident that everything went well.

I just put oil in it and filled the radiator with distilled water instead of coolant to check for leaks. I started the bike and it was only on for a minute before I put my hand on the water pump and it was heating up pretty damn good and getting hotter by the second.

I never noticed the water pump heating up quickly like that before but to be honest I'm not sure I ever started the bike and then put my hand on it to check if it was hot. Is it heating up quickly like that normal? Again, the bike was only on for a minute. I'm afraid there is some abnormal friction in there causing the heat up.

I'm paranoid about this bike because I love it so much I would freak out if I ever damaged it. I figured I'd better ask the brain trust here before I move ahead. So I guess the question is does the water pump housing heat up very quickly like that if the water pump is working normally?
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post #2 of 6 Old 12-16-2018, 01:06 PM
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Considering that with a T-Bob the temp goes to 160ish very quickly, it sounds normal. I have to admit that I have never paid attention to how quickly it comes up.

@pdwestman has shot his bike with an IR quite a bit. He might have it in his notes.

If not, I will fire mine up and see how quickly the pump housing heats up. Pauls bike is probably put up for the winter.
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post #3 of 6 Old 12-16-2018, 01:42 PM
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I run mine just now and could still easily touch the cover after 2-3 minutes running, then once the temp gauge moved up a bit it was getting too hot to touch for more than a couple seconds.
T-bob installed. It’s about 55 degrees in the garage where I ran it.
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Last edited by dan filipi; 12-16-2018 at 01:45 PM.
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post #4 of 6 Old 12-16-2018, 02:50 PM Thread Starter
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I can't thank you guys enough for taking the time to help me out with this.

I ran it up to around 210 on the temp face overlay and the fan kicked on. The pump housing was really hot, especially the left hose housing (not the cyl), but I guess it's supposed to be. It makes sense but like I said I'm paranoid about the bike. I'm a shade tree mechanic on my best day. I'm going to keep an eye on it.

The good news is that it looks like the oil stayed clean and there was nothing coming out of the weep hole.

Thanks again guys, you're the best.
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post #5 of 6 Old 12-17-2018, 12:26 PM
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Sorry that I didn't see this yesterday.

The left hand or rearward hose on the waterpump housing is the lower radiator hose.

The T-Bob "T" is installed into this hose, so the warming coolant from the warming cylinder head is going to warm the waterpump cover considerably faster than it ever used to, because there is No Trickle of coolant passing thru the 'cooler' (radiator) from the bleed hole in the old oem 160f thermostat. The warmth is re-circulated, rather than dissipated.

Therefore the whole cylinder, cylinder head, piston, rings, coolant & even the engine oil warms up faster & higher (195-210f) just like the T-Bob was designed to do.

I just started my bike, from a 67f temp. 1 min - 75f / 2 min - 90f / 3 min - 122f Measured with IR on the elbow of the black rubber LH/Rearward hose.
The RH/Forward/CYL hose was cooler because the waterpump impeller / clutch cover / waterpump housing are all absorbing heat.


ps, I forgot to write down the temp of the metal WP housing when the rubber hose was 122f, but it was warmer than my finger tips appreciated.

Last edited by pdwestman; 12-17-2018 at 12:35 PM. Reason: ps added
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post #6 of 6 Old 12-18-2018, 05:44 PM Thread Starter
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Quote:
Originally Posted by pdwestman View Post
Sorry that I didn't see this yesterday.

The left hand or rearward hose on the waterpump housing is the lower radiator hose.

The T-Bob "T" is installed into this hose, so the warming coolant from the warming cylinder head is going to warm the waterpump cover considerably faster than it ever used to, because there is No Trickle of coolant passing thru the 'cooler' (radiator) from the bleed hole in the old oem 160f thermostat. The warmth is re-circulated, rather than dissipated.

Therefore the whole cylinder, cylinder head, piston, rings, coolant & even the engine oil warms up faster & higher (195-210f) just like the T-Bob was designed to do.

I just started my bike, from a 67f temp. 1 min - 75f / 2 min - 90f / 3 min - 122f Measured with IR on the elbow of the black rubber LH/Rearward hose.
The RH/Forward/CYL hose was cooler because the waterpump impeller / clutch cover / waterpump housing are all absorbing heat.


ps, I forgot to write down the temp of the metal WP housing when the rubber hose was 122f, but it was warmer than my finger tips appreciated.
Thank you @pdwestman,

That's really good info, I appreciate that big time!
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