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| 67 Cooper S running hot https://www.ausmini.com/forums/viewtopic.php?f=2&t=91058 |
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| Author: | glenndunn [ Thu Nov 19, 2015 9:54 am ] |
| Post subject: | 67 Cooper S running hot |
Hi all I am only new here, was wondering if anyone could help me with my S running hot. Sometimes it sit about 185 - 190 but when speed increases over 80 is it will get up to 200 and further, it has not boild yet but I don't want to push it, I have flushed the system but I'm not sure if the rad is a proper Cooper s how can I tell and also I have taken the thermostat out which helped a little not much, should I put it back in as I've been told yes they should run with a thermo in Cheers Glenn |
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| Author: | simon k [ Thu Nov 19, 2015 11:11 am ] |
| Post subject: | Re: 67 Cooper S running hot |
Put the thermostat back in, the water flows too fast without it and doesn't get enough time to cool in the radiator No difference between an S radiator and a standard car (deluxe or otherwise). Best thing to do is remove the radiator, have it checked and cleaned properly, flush the block with a garden hose in the top radiator hose (do it while the thermostat is still out) While the radiator is out, remove the water pump and check the condition of the blades. A new pump is < $50 so stick a new one in Then have it tuned properly, running lean or retarded will make it run hot 200* F is 93* C, it shouldn't be getting that hot, but it's not |
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| Author: | glenndunn [ Thu Nov 19, 2015 11:28 am ] |
| Post subject: | Re: 67 Cooper S running hot |
Thanks Simon the only thing I didn't do when I had the rad out was the water pump, will try a new one and check the timing Thanks Glenn |
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| Author: | 1018cc [ Thu Nov 19, 2015 12:50 pm ] |
| Post subject: | Re: 67 Cooper S running hot |
I don't know if S blocks have it but there is a plug down near the clutch slave cylinder that faces the firewall. I have removed the plug before and cleaned that out and run water through the block through that port too. If you are going to all of the above trouble, why not try that as well. +1 on checking timing and mixture. |
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| Author: | winabbey [ Thu Nov 19, 2015 1:33 pm ] |
| Post subject: | Re: 67 Cooper S running hot |
You say it hasn't boiled yet so is your temperature sender and gauge accurate? If you have access to spares you could try them so as to confirm it really is overheating. |
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| Author: | gtogreen1969 [ Thu Nov 19, 2015 1:47 pm ] |
| Post subject: | Re: 67 Cooper S running hot |
I bought an infrared thermometer for $15 and checked it was calibrated on the kettle. |
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| Author: | 1018cc [ Thu Nov 19, 2015 1:58 pm ] |
| Post subject: | Re: 67 Cooper S running hot |
gtogreen1969 wrote: I bought an infrared thermometer for $15 and checked it was calibrated on the kettle. Even the cheap ones are quite good. I also have a cheap one (probably about the same price as you paid) and have compared it to an expensive one ($100 or so I think it was). My cheapie read within 0.2°C of the expensive one on the hot surface we tested it on >150°C from memory. |
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| Author: | glenndunn [ Thu Nov 19, 2015 3:25 pm ] |
| Post subject: | Re: 67 Cooper S running hot |
Well that's another problem I'm not sure if my temp gauge is accurate, it may be reading high in that case it might be running at normal temp I will have to check it and see, thanks for all the help everyone |
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| Author: | phillb [ Thu Nov 19, 2015 3:49 pm ] |
| Post subject: | Re: 67 Cooper S running hot |
I made certain about the gauge by removing the sender from the head but still connected and dip it in a kettle and bring to boil watching the gauge. Disconnect the coil so u don't damage it cause you'll need the ign on. The smiths gauge are usually 75deg at N and 100deg at the beginning of the red mark. Also at the same time drop your thermostat into the water and as it heats up to make sure it opens fully and at the right temperature. The little infrared thermometers are also a handy little tool. |
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| Author: | danny_ [ Thu Nov 19, 2015 4:26 pm ] |
| Post subject: | Re: 67 Cooper S running hot |
Does anyone know how much more effect the 6 blade metal fans are compared to 11 blade plastic (new ones) The temp rises from 84 to 100c while sitting in traffic on a 28c day, 35c day the car ran at 99-100c with thermo fan on. |
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| Author: | i got a mini [ Thu Nov 19, 2015 5:32 pm ] |
| Post subject: | Re: 67 Cooper S running hot |
Keep the plastic one imo, I have a warm 1100 and it never gets off normal no matter how hard I flog it or how long it sits there. keep the plastic fan get the cooling system right and running right and it won't over heat  on a 40 deg day mine stays on normal and yes my gauge is accurate
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| Author: | GtiMini [ Fri Nov 20, 2015 9:01 am ] |
| Post subject: | Re: 67 Cooper S running hot |
Also check to make sure your fan isn't on backward. |
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| Author: | danny_ [ Fri Nov 20, 2015 10:33 am ] |
| Post subject: | Re: 67 Cooper S running hot |
GtiMini wrote: Also check to make sure your fan isn't on backward. Its on the correct way thermostat also pops open at 82c. New rad time i think. The previous owner put a whole bottle of head gasket copper repair and i cant seem to flush it all out. |
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| Author: | drmini in aust [ Fri Nov 20, 2015 11:13 am ] |
| Post subject: | Re: 67 Cooper S running hot |
Danny, Get the rad cleaned out professionally. About $150. For added peace of mind I'd add a Clubby heater core behind the grille. |
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| Author: | deluxe67 [ Fri Nov 20, 2015 11:25 am ] |
| Post subject: | Re: 67 Cooper S running hot |
Or you can buy an alloy radiator for about $120. They are very good, doesn't go above "N" even on a hot day including being stuck in a traffic jam for 1 hour (temp was in the 30's) |
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