irvined
|
 posted on 2/5/06 at 08:09 PM |
|
|
Cooling
I have a 1300 xflow, with a polo radiator, and its overheating.
Havent touched the timing since it was out of the donor and it ran and worked fine then. I've spent the afternoon moving the radiator down as
low as I can get it so that the thermostat housing where I fill it up is the highest point in the system. I can now more or less fill it in one go
although it does seem to trap quite a lot of air.
When i look down onto the thermostat, I can see water sloshing around from the top radiator hose, however there doesnt appear to be any flow (Even
when the thermostat is closed.) through the heater circuit, is this normal? I had expected that to have quite a lot of water flowing through it.
If thats not normal, whats likely wrong? I dont have a heater, so that hose from the inlet manifold goes directly into the water pump.
*boggled*
David
http://irvined.blogspot.com
|
|
|
|
|
flak monkey
|
| posted on 2/5/06 at 08:11 PM |
|
|
Air lock is the most likely cause.
Check the top and bottom rad hoses are getting hot. If not you probably have an air lock in the system somewhere.
Have you got a header tank fitted?
David
Sera
http://www.motosera.com
|
|
|
irvined
|
| posted on 2/5/06 at 08:49 PM |
|
|
No header tank,
Whats the best cure for an airlock? so far i've drilled a 4mm hole in the stat to let a little watter past just in case, and i've
disconnected the heater hoses and filled the system up through that which has made a difference.
Rad hoses are getting hot, and i can see water circulating when i remove the filler cap.
Cheers
David
http://irvined.blogspot.com
|
|
|
Chippy
|
| posted on 2/5/06 at 10:14 PM |
|
|
Drilling a four mil hole in the stat is definately not a good idea, I would put a new stat in, and then clear what would seem to be an air lock. I am
not conversant with the Polo rad, does that have a facility to bleed it, if not you will need to get the top hose lower than the stat housing on the
engine, to allow air to bleed back and out of the filler. If you cant do this you will need to somehow fit a vent to the top of the rad. Hope that all
helps. atb Chippy
|
|
|
MikeR
|
| posted on 2/5/06 at 11:30 PM |
|
|
add a picture to the photo archive.
I seem to recall your system looked very similar to mine.
When i added water to mine it self bled (apart from the top of the radiator which had very little air in it to bleed out)
have you tried filling it with the rear raised up / front raised up?
squeezing a hose to push water round? whilst filling?
without a stat
after how long does it get hot?
have you checked the stat opens correctly (could be bust)
|
|
|
David Jenkins
|
| posted on 3/5/06 at 07:04 AM |
|
|
I had the same problem when I first filled my x-flow - turned out to be air stuck under the thermostat, which then kept the water off the wax
cartridge in the 'stat, so it never opened.
I took advice here and drilled a tiny hole in the 'non-active' part of the thermostat (about 2mm dia). This would have little or no
effect on the engine when the 'stat was closed, but did let the air through when filling.
I poured coolant in - got a stream of bubbles through the hole - poured in more - more bubbles - and so on, until I got no more bubbles. Squeezed the
hoses as much as possible - more bubbles - topped up and the nall was OK (eventually - took me 2 or 3 attempts at filling before I cleared all the
airlocks).
Dumb question - do you have the stat the right way up? You wouldn't be the first, nor the last...
David
|
|
|
DarrenW
|
| posted on 3/5/06 at 08:35 AM |
|
|
I had similar problems with my Pinto. It was caused by the block being sludged up (happened before i got engine). I ran it for a while with good
antifreeze mix. Suffered muddy brown looking water for a while being ejected. I then flushed for ages with hosepipe and refilled which has improved it
no end. Next job is to use proper coolant system flush.
So in summary mine was caused by excessive sludge and possible air lock. Last time i refilled i took the water pipe off the carb, held it high up and
filled from here first then topped up the rad. I then went thro 3 warm up cycles with rad cap off and finally topped up. It was great on Sundays 400
mile round trip.
|
|
|
irvined
|
| posted on 4/5/06 at 12:05 PM |
|
|
As usual, it was a combination of lots of minor things.
Its all working now though, i was getting airlocks because the rad was too high, the fan wasnt coming on because the polo thermostat was a bit wonky,
and it was in the rad so not getting hot enough in the first place, there was an airlock, in the top hoses, and the engine was full of sludge.
So i flushed and flushed and flushed, then i moved the radiator down a little, then i used a fan switch in the thermostat housing, adjusted the timing
and mixture, and now it gets to about 100C, fan comes on, goes down to 90C, fan goes off, happy bunny? Oh yes I am.
Cheers for the help.
http://irvined.blogspot.com
|
|
|
