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Author Topic: Help please. Waterpump gone!  (Read 1226 times)
madbikemike
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« on: December 14, 2017, 01:36:46 PM »

My water pump has broken, im looking for parts but cannot find one anywhere, used, replacement new etc. Does anyone know if the part goes on any other bike at all.
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a_morti
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« Reply #1 on: December 14, 2017, 01:57:53 PM »

This came up on the Facebook group recently. Graeme France of GF racing can refurb pumps.
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Drewski
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« Reply #2 on: December 15, 2017, 10:01:17 AM »

Yeah...quite a few aftermarket impellers on the market now. Most used ones will be sold with the motors. What failed on your pump?
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Drewski
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« Reply #3 on: December 15, 2017, 10:08:37 AM »

May be worth a follow up, how's your German? :-

http://www.bike-teile.de/dealindex.php?deal=361&pfd=1570841_wasserpumpe_honda
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a_morti
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« Reply #4 on: December 15, 2017, 12:48:19 PM »

That's a used part.
I speak German if help is needed, but generally if you converse in plain English (leave out subtleties, inferences, metaphors, or turns of phrase) you'll get by in English.
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Drewski
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« Reply #5 on: December 15, 2017, 02:34:50 PM »

Going by how few there are around, it may be worth a punt.
Talking about translation, I found this Japanese blog where the chap has fitted a different waterpump to the CB-1 cap. It's not pretty but he says it lasted a year.
You'll need to click the translate icon in the address bar:-

https://ameblo.jp/kawakido/entry-12067319480.html
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Drewski
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« Reply #6 on: December 15, 2017, 02:38:25 PM »

Looks like the CB-1 pump has a mechanical water seal that packs up, (probably from incorrect coolant use).
 I've just rebuilt the GT Water Pump which has a similar affair. The same seals are used by washing machine manufacturers but it's not that easy to get hold of the correct size.
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madbikemike
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« Reply #7 on: December 22, 2017, 01:09:12 PM »

So as it's Xmas a miracle happened, I found a water pump.... But....

Went to fit it but it went in too easy, the part that connects the engine to the pump is too worn now and so will not move anything.  Now I'm on to plan b.  To use an electrical hot water pump to circulate the water.
I'm not sure this will work and for how long but I think it's my only option. Has anyone replaced the drive from the engine side before and how big a job is it.

Ps anyone know how to take the propeller out of the water pump?


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a_morti
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« Reply #8 on: December 22, 2017, 03:14:06 PM »

How can it possibly wear out? It's just a key drive. If you line it up it will work, except if it's broken off which wouldn't be by wear but rough handling. If that happened you should pull the sump anyway as there's a shard of metal in there now.
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Spurlock
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« Reply #9 on: December 22, 2017, 04:27:56 PM »

So as it's Xmas a miracle happened, I found a water pump.... But....

Went to fit it but it went in too easy, the part that connects the engine to the pump is too worn now and so will not move anything.  Now I'm on to plan b.  To use an electrical hot water pump to circulate the water.
I'm not sure this will work and for how long but I think it's my only option. Has anyone replaced the drive from the engine side before and how big a job is it.

Ps anyone know how to take the propeller out of the water pump?

Agree with a_morti, it seems the only thing that could have happened is the tab on the end of the drive shaft broke off. Looking at the manual the water pump is driven off the oil pump shaft. Chapter 4 of the manual describes oil pump removal as:
-drain oil
-remove oil pan
-remove clutch cover and clutch
-remove oil pump sprocket
-remove pump

From there it's a simple matter to remove the pump shaft and repair or replace it.

-Bill
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1975 Honda CB125S2, 1989 Honda NX250, 1989 Honda GB500, 1989 Honda CB-1
madbikemike
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« Reply #10 on: December 22, 2017, 05:31:30 PM »

Yes it has snapped, then I ran it without knowing which rounded the shift, it broke as my very old  coolant froze and jammed the water pump.  how long or difficult would it be to sort oil pump, competent diyer or garage?
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Spurlock
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« Reply #11 on: December 22, 2017, 05:57:20 PM »

Yes it has snapped, then I ran it without knowing which rounded the shift, it broke as my very old  coolant froze and jammed the water pump.  how long or difficult would it be to sort oil pump, competent diyer or garage?

Looks like a special tool (clutch center holder) would be needed when removing the clutch nut, and possibly a tool to hold the crank stationary when removing the pump sprocket bolt. After that the rest looks straightforward. Here is a good looking oil pump + extras on ebay:
https://www.ebay.com/itm/Honda-400-CB-CB1-CB400F-CB400-F-Used-Engine-Oil-Pump-1989-1990-SM222/112641794062?hash=item1a39f9600e:g:fKAAAOSw241YeWc-:sc:USPSPriorityFlatRateBox!95688!US!-1&vxp=mtr

-Bill
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1975 Honda CB125S2, 1989 Honda NX250, 1989 Honda GB500, 1989 Honda CB-1
a_morti
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« Reply #12 on: December 22, 2017, 06:14:21 PM »

If you have or can borrow an impact gun, clutch nuts are not a problem. Same probably goes for the other nut.

Sump gaskets are getting hard to find, get that before pulling the sump.
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Drewski
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« Reply #13 on: December 23, 2017, 11:22:48 AM »

Yes it has snapped, then I ran it without knowing which rounded the shift, it broke as my very old  coolant froze and jammed the water pump.  how long or difficult would it be to sort oil pump, competent diyer or garage?

Oil pump....or water pump?
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