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 Post subject: Help Help Overheating
PostPosted: Thu Jul 18, 2013 11:36 pm 
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Whats your location?: Kildare
Region: Eastern
What Minis have you?: 1975 VTEC round nose
1976 Mini Clubman
Location: Naas
Hi, I'm very frustrated with my 1976 mini overheating.

What keeps happen after driving a couple of miles the pressure builds up to the point the cap can no longer hold the pressure and water sprays everywhere.

I did a test on the thermostat (brand new) . It a 82 degrees thermostat. Opened fine. I then replaced the 13lb rad cap (brand new) with a 15lb cap last night and let the car tick over for an hour without any problems.

Thinking the problem was sorted I went for a couple of miles this evening and it happened again.

can anybody give me some pointers?


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PostPosted: Fri Jul 19, 2013 9:06 am 
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Whats your location?: Longford
Region: Eastern
What Minis have you?: 1971 Mini Marcos.
1984 Mini Sprite
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Modifications: 1380cc
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S/C CR gearbox and drop gears
Location: Longford
Do a compression test, any mayonnaise on the oil cap ?

Did you drain/flush the rad and block?

Is the water pump circulating the water ?

Is the internal heater working ?

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PostPosted: Fri Jul 19, 2013 9:43 am 
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Whats your location?: Kildare
Region: Eastern
What Minis have you?: 1975 VTEC round nose
1976 Mini Clubman
Location: Naas
I will check the oil cap.

I didn't drain the rad yet, That was my next step. What's the best way to do it?

The water pump is new.

The internal heater it work.


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PostPosted: Fri Jul 19, 2013 10:50 am 
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Whats your location?: Drogheda
Region: Eastern
What Minis have you?: Traveller
Turbo
Hornet
Equinox
MINI Clubman
Location: LOUTH
Two things that can cause a "good" engine to overheat are lean fuelling and timming off. If your car is standard it will have a HS4 carb ,check the bottom of the floatchamber for dirt. Check that the dizzy is tight and hasn't moved.
Does the car start easy and how does it run?

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PostPosted: Fri Jul 19, 2013 12:18 pm 
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Whats your location?: Kildare
Region: Eastern
What Minis have you?: 1975 VTEC round nose
1976 Mini Clubman
Location: Naas
Hi Woody.

Interesting you say that. I got the timing done but I wasn't very happy with it. He told me that he had set the mixture quite rich because I would not be using the car a lot. Also when I try and start the car its like the battery is low or the engine is trying to fire on a wrong cylinder and push the engine in the other direction. But when the engine is running it runs well.


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PostPosted: Sat Jul 20, 2013 12:05 am 
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Whats your location?: Drogheda
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Hornet
Equinox
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Location: LOUTH
Doesn't sound very reassuring, petrol and air have an optimum mix for best performance ,running too rich or too lean is not good by any means for daily use. Sounds like the timing is too advanced and you'll have to get it set by someone that knows what there doing. Check that the vacumn advance and centrifucal advance are working properly first.

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PostPosted: Sat Jul 20, 2013 6:04 pm 
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Whats your location?: Kildare
Region: Eastern
What Minis have you?: 1975 VTEC round nose
1976 Mini Clubman
Location: Naas
Found the problem. When I took off the drain plug at the back of the block no water came out. I flushed out the water and put in Holts "Speed flush", ran the engine for 40 minutes without the drain plug and still nothing.

I'm not sure what to do next. Thinking of using my compressor to blast air up the drain hole but will have to find a way to seal the hole to get good pressure.

Any advice??


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PostPosted: Sat Jul 20, 2013 7:51 pm 
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Whats your location?: Drogheda
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Location: LOUTH
Not likely its your problem, often happens. Push a 8mm drillbit in and turn by hand, should clear it out.

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PostPosted: Fri Aug 02, 2013 1:22 pm 
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Whats your location?: Kildare
Region: Eastern
What Minis have you?: 1975 VTEC round nose
1976 Mini Clubman
Location: Naas
Thanks Woody. That unblocked it.

After flushing the system, Clearing the blockage in the drain hole at the back of the block, removing the thermostat, using a 15lb rad cap instead of the standard 13lb and installing a new Water pump it's a bit better but not quite.

The next step is to remove the rad to see if there's a blockage. Does anybody know what the capacity of the standard Rad from a 1976 Clubman is?


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PostPosted: Fri Aug 02, 2013 1:30 pm 
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Whats your location?: Drogheda
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Location: LOUTH
Did you get the timming and mixture checked?

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PostPosted: Fri Aug 02, 2013 1:33 pm 
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Whats your location?: Kildare
Region: Eastern
What Minis have you?: 1975 VTEC round nose
1976 Mini Clubman
Location: Naas
No not yet, I can do all the cooling check but will have to farm out the timing.


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PostPosted: Fri Aug 02, 2013 2:17 pm 
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Whats your location?: Drogheda
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Hornet
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Sounds like you may be chassing your tail looking for the problem in the wrong place. The cost of fitting new parts which may not be needed could buy a timming gun.

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PostPosted: Mon Aug 05, 2013 7:06 pm 
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Whats your location?: Kildare
Region: Eastern
What Minis have you?: 1975 VTEC round nose
1976 Mini Clubman
Location: Naas
You were absolutely correct. The timing was way off, have no idea how the engine was even running. The overheating problem is solved.

Thanks for your help.


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PostPosted: Tue Aug 06, 2013 7:18 pm 
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Whats your location?: Drogheda
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Hornet
Equinox
MINI Clubman
Location: LOUTH
Result :D

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