How do I Know If the Water Pump is Working - Suzuki Z400 Forum : Z400 Forums
 
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post #1 of 5 (permalink) Old 04-21-2018, 07:26 PM Thread Starter
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How do I Know If the Water Pump is Working

Hello everyone,
I just acquired a 2008 LTZ 400 and I have a question. First background...I got it used and it needed to head work (new valves and such) so I removed the head and took it to a local shop. It came out perfectly and I reinstalled it with all new gaskets (the sleeve and piston looked great so I didn’t touch the bottom end).
I also drained all the coolant and oil and replaced it all.
Now I got the bike started but I wanted to verify the water pump was working. The previous owner bypassed the switch on the radiator that controls the fan and has it wired “always on” so I really have no idea when the bike is getting “too hot”.
I removed the coolant cap and started the motor and the level appeared to drop a little but I can’t really see it moving like it is circulating. I figured the last head issue was related to overheating (but the cams and seats looked perfect upon removal) and I don’t want it to happen again...any advice?
Sorry if I was rambling, just wanted to give complete info.
Thanks in advance...Ron
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post #2 of 5 (permalink) Old 04-22-2018, 10:17 AM
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remove both radiator pipes( feed and return)
remove themostat
coolant will come out from radiator
grab a bottle with coolant or distilled water.
start the engine cold and with the bootle feed it trough the water pump, small increments, dont throw it all at once
liquid should come from the other side( return side) and when you pour it trough the pump, it will suck the liquid right up, if its not working(stalled) it wont suck.
dont let the engine warm up as might know what will happen
try this only 1 or 2min running

the way you did, it should be visible the water flowing in the rad

Last edited by glock; 04-22-2018 at 10:19 AM.
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post #3 of 5 (permalink) Old 04-22-2018, 08:18 PM Thread Starter
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Thanks for the help! I’ll let you know how it goes...
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post #4 of 5 (permalink) Old 04-25-2018, 06:33 PM Thread Starter
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Well I removed the hose and it is definitely sucking the coolant in. I rode it today and it seemed ok but I am going to check it as I ride...thanks!!!
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post #5 of 5 (permalink) Old 11-12-2018, 02:07 PM
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if it sucks the water from pipe then its working

i had an issue before, the circlip came out and the pump impeller pin also came out, however i wasn't overheating.
maybe some friction turning was stil there, but not enough to turn the fan off which was always working.
thats how i knew something wasnt ok
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