omega0684
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| posted on 8/10/08 at 03:35 PM |
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cooling problem?
just put the car outside and started it up to get it up to temperature so that i could get it to idle nicely, when i came across a problem,
i topped up the coolent as it was looking a little low, hmmmmm i thought thats odd. anyways continued to let the engine run and watched the temp gauge
on the megasquirt screen intently! as it reached about 60 on the screen i noticed steam vapour coming from the breather! now that is odd i thought,
left it a little longer until it read 65, i kept an eye on the breather pipe and noticed that the vapour was now coming out faster and now in a
smoking pipe kind of way, like looking at a boiling kettle (but no whistling).
i turned the engine off and took the top off the header tank, BIG MISTAKE, i was exposed to a volcano of boiling water and it pi**ed all over my
engine bay!  
i got the sensor from the same guy that i got my MS from and he said that the sensors he sold are compatible to the MS and that i dont have to
calibrate it, i just connect it up, now im not so sure, the gauge was reading 65 degrees and it was boiling away in the pot!
what is my next move? any suggestions?
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JeffHs
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| posted on 8/10/08 at 03:40 PM |
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Are you sure you didn't have an airlock such that your sensor wasn't in the water? I had a Pinto with a leaking water pump. It would
slowly drain down with no adverse indication on the gauge (in winter the heater would go cold) until it boiled.
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omega0684
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| posted on 8/10/08 at 04:00 PM |
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the sensor is plumbed into a small tube that comes out of the head
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02GF74
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| posted on 8/10/08 at 04:15 PM |
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Water vapour (steam) is by product of combustion process as well as some condensation inside the engine mean that as engine warms up, you can expect
to see some steam coming out of the breather.
Once warmed up, say running for maybe 10 minutes, the condensation should have boiled off. Revving engine will increase the amount of steam from the
breather, this is quite normal.
But steaming like "a kettle" sounds too excessive to me and the finger of blame would be towards the head gasket although you would be
losing water, possibly via the exaust. The level in the tank when cold would drop.
hmmm, just noticed this bit: the gauge was reading 65 degrees and it was boiling away in the pot!
unless you are building on top of mt everest, the reading cannot be correct. the fact that the water is boiling - is it really boiing and not bubbles
of exhaust gas? - is not good.
Have you checked the radiator is getting hot?
[Edited on 8/10/08 by 02GF74]
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omega0684
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| posted on 8/10/08 at 04:33 PM |
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i thought the sensor had to be on the block side of the thrmostat?
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omega0684
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| posted on 8/10/08 at 04:54 PM |
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is this feasable?
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britishtrident
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| posted on 8/10/08 at 07:37 PM |
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Have you got a by-pass hose connection fitted ? you need one or the water i the block around the cylinders will start boil long before the the
thermostat or temperature sensor even get warm.
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omega0684
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| posted on 8/10/08 at 07:52 PM |
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a bypass hose to bypass what? a drawing may help
[Edited on 8/10/08 by omega0684]
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clairetoo
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| posted on 8/10/08 at 08:29 PM |
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I'm guessing your not using the original ford temp sender - so why not just tap it to the right size and fit the new sender in the right place
(in the head , before the thermostat) ?
Its cuz I is blond , innit
Claire xx
Will weld for food......
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omega0684
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| posted on 8/10/08 at 09:18 PM |
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i am using racetech gauges from rally design, so im guessing i need to use a racetech sender as when i used the original sender on the gauge it just
read that the car was over heating all the time!
[Edited on 8/10/08 by omega0684]
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Chippy
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| posted on 8/10/08 at 09:55 PM |
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Your temperature sender, and gauge, are going to have no effect on the temperature of the water. That is controlled by the thermostat, so even if you
gauge in telling lies, it should make no difference to whether the the thing overheats or not. If it's telling lies to the MS even that
won't make it boil, as it will just run very rich, which should keep the engine cooler. I think you have a problem that is to do with something
else, head gasket sounds a likely suspect to me, although could be something else. Cheers Ray
To make a car go faster, just add lightness. Colin Chapman - OR - fit a bigger engine. Chippy
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mark chandler
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| posted on 8/10/08 at 10:55 PM |
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assuming the sender is incorrect you need to break out the multimeter and test resistance at zero, 50 degrees and boiling then use
this to set up the variables.
Regards Mark
[Edited on 8/10/08 by mark chandler]
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