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Post by oddjob1 on Oct 8, 2009 18:06:24 GMT 1
hi..any other bikes use same pump? are they straight forward to fit? can't find one on ebay.
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Post by ilegalalien on Oct 8, 2009 19:06:54 GMT 1
yea they just bolt on, i have one spare if you want it
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Post by oddjob1 on Oct 8, 2009 19:33:43 GMT 1
hmm..how many beer tokens or any spares you are after? i have a few parts..calipers,rear seat panel,a mirror,relays and few other bits
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Post by ilegalalien on Oct 8, 2009 20:04:32 GMT 1
we are talking about the impellor? on the bottom left hand side of the engine?
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Post by oddjob1 on Oct 8, 2009 20:25:56 GMT 1
yeah..bike overheats..have changed thermostat,bypassed temp switch on radiator, outside casing on impellor is damaged so guessing it going to be that.
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Post by ilegalalien on Oct 8, 2009 21:11:52 GMT 1
Bypassing the temp switch on the rad should set the fan on all the time.. if it's earthed that is..
is the fan on all the time?
NTV's dont need thermostats, they're only there for cold countries, i ran a ntv for 3yrs without one.
The impellor is a slot drive connection and unless that has snapped it can't really break, have you checked the thermostat opens in boiled water from the kettle, it should open 5mm or more, bung it in a cup and watch it open and close, if it dont then no worries, chuck it in the bin and run without one. run the bike from cold with the thermostat cap off (with no thermostat), you should see water circulating, if you dont then it's the impellor. Also i suggest you take the thermostat out, reconnect the temp sensor and run the bike without, if it overheats whilst ticking over then we have eliminated the thermostat.. then it must be the temp sensor or wiring to it (test by earthing the spade terminal, the fan should start)... try these ideas and see where you get
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Post by ilegalalien on Oct 8, 2009 21:13:06 GMT 1
a lot of the cooling system is the same on NTV, revere, Bros, NT650Hawk, cb1 500
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Post by oddjob1 on Oct 8, 2009 21:41:39 GMT 1
ok thanks...fan does come on when earthed(made a switch) but doesn't seem to reduce temp much if at all.this is why i think it the pump.if no water circulating then switching fan on wouldn't make any difference. will try without thermostat and cap tomorrow to confirm.
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Post by McF on Oct 9, 2009 8:29:06 GMT 1
Endorse everything said by illegal and a tale of my own to add
Bought a second engine and installed that. Started up and she ran beautifully. Took her on a short ride around the village; no first / second gear problem, but I had a terrible rattle and started overheating.
Traced this to the water pump, removed the cover and a lot of "teeth" fell out - every blade off the impeller had sheared off (god knows why).
So I removed the pump body from the older engine (with gear problems) refilled the cooling system and all was well (until I discovered the head gaskets are probably blown - but that is hardly surprising!).
Personally, I think it will be easier to drain the cooling system and remove the top of the pump to take a look at the impeller, than remove the tank, air filter etc (I used to hate that - I did it so many times!!!)
I found a few breakers yards (2 years ago) with pumps in for under £30 if you do end up needing one.
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jonno1962
Ahh! Just passed their bike test
Posts: 25
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Post by jonno1962 on Oct 11, 2009 21:07:25 GMT 1
always keep a close eye on my cooling systems as i had a cx500 with pump problems, and they were sods to get to(motor out), i had the housing on my revere crack so i welded it up, has been fine since, she gets a bit hot under the collar on warm days in slow traffic but any other time is fine, change the coolant on a regular basis though (50/50 distilled and anti freeze).
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Post by oddjob1 on Oct 12, 2009 12:55:50 GMT 1
drained the system..brown liquid,took thermostat out,refilled with water,switched engine on.seems to circulate but water turned brown. guessing an oil seal gone at pump?
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Post by McF on Oct 12, 2009 13:07:48 GMT 1
drained the system..brown liquid,took thermostat out,refilled with water,switched engine on.seems to circulate but water turned brown. guessing an oil seal gone at pump? It's not the oil seal at the pump. Look underneath the pump and you will see a small drain hole. There are two seperate seals, one is an oil seal into the engine (the water pump is driven from the back of the oil pump), the other is a water seal for the pump. If either seal fails, they will drain via the small hole I mentioned and that way, you do not get oil in the water, or water in the oil. If the cooling system is getting brown quickly, it may be your head gaskets, pressurised exhaust gasses getting into the cooling system. You can have the coolant (or fresh water by the sounds of it) checked for presence of hydro carbons. Your local garage may be able to do this for you. Compression testing on your cylinders is also worth doing. I speak with the voice of experience  My aNTy's engine is sat on the bench awaiting time for me to strip and replace the head gaskets as all evidence points to them having failed. I've been there with dirty brown coolant etc Did you take the top off your pump and check the impellor? Sounding more like you don't need to, but the cure is going to be a headache if you need to replace head gaskets. If that is the case, I'd recommend "engine out" to work on the front one |
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Post by ilegalalien on Oct 12, 2009 13:41:20 GMT 1
Sounds like your system needs a good flush because of years of rust build up from the radiator and steel pipes ect, i'd take off the impellor case front (not the back part) and put a garden hose into the thermostat cap hole, run some water through it till it gets clean, replace the cap and then i'd take off the hose from the front cylinder (front of the engine) and do the same, this will clean it all out and possibly remove any bad build up's, then do the same to the resevoir's container, then refit all bits and fill with water and test, I done this on one of my NTV's and it improved the running temp but i also removed the 2 sensors and cleaned them with emery cloth.. it ran perfect after a good flush.
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jonno1962
Ahh! Just passed their bike test
Posts: 25
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Post by jonno1962 on Oct 12, 2009 18:37:23 GMT 1
Good advice, also replace the o ring seal before you put the impellor cover back on, they flatten with age, in fact that goes for any o ring or seal that has been disturbed, especially when it comes to cooling systems, they do tend to leak if seals are reused. dont want to preach but i've come unstuck a few times while trying to save a few bob!
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Post by oddjob1 on Oct 13, 2009 12:45:40 GMT 1
flushed system out..take for trip later...back brake pedal starting to get sticky..always something to do
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