43 replies to this topic

[daenesh]

hey guys lemme cut this short and get to the point.. i recently did a complete ovehaul on my 998A+ engine and i made sure the block was clean and rust free... i used a high flow cast non bypass water pump like those fitted in 1.3 and im using a 3 core radiator with a copper/brass top which is in good condition as i recently cleaned it.. with a mini radiator cap as well 13lb or 15lb cant remember sorry.. also i have an extra electric fan which is operated with a switch and runs all the time im driving.. i have an air conditioning unit and the problem starts when i on my AC unit.. the higher the speed the longer the compressor runs right and the hotter the engine gets.. i used my standard meter and it goes slightly pass 3/4 and to be sure i used another temp gauge with its own sender unit and got a temp reading of almost 90+ but stays there.. i find that really hot considering the engine is in tip top condition.. not running lean nor is the timing out.. all good..

anyone can shed some light on this situation??

[KernowCooper]

I assume the timing and CO are correct both these could make it run hot, but you appear to have checked these? from your description sounds like the extra load of the air con is loading up the engine, how many miles has the engine done since the rebuild, new engines if a tight built will run a bit hotter. I see from your location its a hot country anyway.

Have you double checked the thermostat for correct operation and what temp is it set to open at? should be stamped on it.

[jaydee]

i used my standard meter and it goes slightly pass 3/4 and to be sure i used another temp gauge with its own sender unit and got a temp reading of almost 90+ but stays there..

91 deg stat?

[daenesh]

thanks for the reply.. yeah with the air cond on it gets hotter the faster i drive.. if its off it stays till half.. my country on a hot day can get up to bout 35 degrees Celsius.. but most other mini owners here dont have that problem.. also ive done 600kms since the rebuild.. and the thermostat when i bought it i sorta boiled it in water and put a thermostat in and the temp it opens up is around 87-88 degrees.. this is the current temp.. picture below..



this is my second gauge reading the same as my original gauge

[KernowCooper]

Just a thought you mention you have a electric fan on all the time, I assume you have the standard engine cooling fan as well, I assume the electric fan is in the N/S wheel arch, does the electric fan blow cold air from the wheel arch into the radiator or extract?
if it blows through would the 2 fans not be working against each other?

The way extra cooling fans work is they are normall set to come on at a preset temp to provide extra air flow when the car is slow moving when the cars standard fan is inneficient and when they reach a preset temp they cut out and as the revs rise the cars standatd fan provides efficient cooling

Does make me wonder if two fans are working against each other in effect reducing the airflow through the radiator, thats if you have the standard fan fitted?

[daenesh]

no no what ive done is the yellow belt driven fan blows and my extra fan in the wheel arch sucks the air out.. therefore we get a one way traffic and all the hot air gets blown and sucked out at the same time..

[KernowCooper]

Are you sure your fans on the right way I'm sure the std plastic ones have engine stamped in the boss of the fan ?

[MRA]

Are you sure your fans on the right way I'm sure the std plastic ones have engine stamped in the boss of the fan ?

The original plastic fan did have "engine side" on it..... and if I had a £1 for every time I saw a fan the wrong way around I'd be very wealthy, and some of those were people who should knw better.

Think of it like this... if you cup your left hand and move it from left to right that is the direction your fan should be blowing air (pay careful attention to the blade shape) now standing in front of your Mini facing into the engine bay your left hand over the radiator fan that is how the fan should also look.

Edited by mra-minis.co.uk, 06 March 2013 - 01:09 AM.

[KernowCooper]

(<---------This side toward radiator

[MRA]

Exactly thanks Dave

[daenesh]

I've rebuilt a few engines mates I'm pretty sure I know if my fan is tye wrong way around.. :) this is why I posted it here cause it's on of those weird situations for me where everything is fitted by the book and yet not working as it should.. Also all fittings and tolerances done to the book with exact measurement so I don't have a "tight" build engine.. Also first I thought the original gauge was faulty so that's why I bought another gauge and machined the sender to fit the head and still gave the same readings

[daenesh]

here you can see for yourself if i have fitted it wrongly..

[Earwax]

Hi

i come from similar Climate - Cairns Australia - and i use a 74 degree thermostat. ( either 74 or 71) - on a 1310 road car. it doesn't have airco (78 a series motor) - in traffic after a long while or after big loading going up hills it did get to 92-95 but otherwise runs early 80s. It could be the thermostat is just giving it 10 degrees too much heat to start with. I recently changed to a tridon high flow thermostat and this brings the heat range down to early 80s in all road situations.

[daenesh]

well running at 95 isnt good.. infact thats what bothers me.. in hotter climates you use higher temp thermostats if not they open too soon and stay open allowing a high water flow and reduced cooling.. this only happens when i on the AC as this put quite a bit of load on a 998 engine.. 1275 and above can handle the added load on and thats why they hardly show any signs of overheating.. today i noticed that it only gets hotter as i drive faster.. once i get stuck in traffic after a few minutes the temp goes down to half.. lets say 80 degrees celcius(guessing)

[firstforward]

Can you run this past me again......


.. in hotter climates you use higher temp thermostats if not they open too soon and stay open allowing a high water flow and reduced cooling..