This year I've put the original engine in the car - a 528 evil Zenith carb e12.
And I have a strange cooling issue. When it was hot outside, the engine would warm up, the thermostat would open, temperature would raise a bit more, a bit over the first line above the middle. Just enough to panic me. But then the fan would kick in and the temperature would stay around that line, while caught in city traffic. As long as I drive, the temperature needle stays around the middle.
And then it got colder outside. Instead of heating up less, the temperature now goes up more, mostly right after warming up. Once the fan kicks in the temperature drops, and then things settle to something acceptable.
It is worst when the car is not moving. Saturday I worked in the carbs, I started the car, but did not move it, temperature went up steady close to red. Then the fan clutch engaged and things cooled down.
The fan clutch is the really old type http://bmwfans.info/parts-catalog/E12/E ... n_coupling
I have changed the clutch #6 with a new one, I have added some washers in an attempt to make it earlier, when it couples it cools well.
Could this be a radiator issue? No coolant flowing in front of the fan, causing the clutch to stay too cold?
Running hot when cold
- Falkenberg
- Posts: 520
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- Location: In Europe, far, far away.
Running hot when cold
1961 Simson AWO sport (Brasoveanca)
1968 BMW 114 2002
1976 BMW E12 528 (Malèna)
1987 Kawasaki GPz900r
1996 Moto Guzzi V75 PA NT
1968 BMW 114 2002
1976 BMW E12 528 (Malèna)
1987 Kawasaki GPz900r
1996 Moto Guzzi V75 PA NT
-
- Posts: 88
- Joined: Mon Sep 20, 2010 9:45 am
- Location: Fairfield, CA
If your radiator was an issue the engine would remain hot.
Does your radiator warm up gradually due to coolant bypassing the thermostat, or does it warm quickly due to the rush of coolant when the thermostat cracks?
Does your radiator warm up gradually due to coolant bypassing the thermostat, or does it warm quickly due to the rush of coolant when the thermostat cracks?
'72 3.5L 5-spd Bavarious - E3 with E12 front struts/brakes, E28 3.25 LSD rear axle, E39 wheels, Webers, etc, etc, etc...
- Falkenberg
- Posts: 520
- Joined: Wed Nov 10, 2010 6:46 am
- Location: In Europe, far, far away.
Gradually.
I was thinking that maybe if the rows near the fan clutch would clog up, that might these kinds of issues..?
Clutch seems to work fine as long as it actually receives heat. I might test this with a heat gun now that I think of it..?
I was thinking that maybe if the rows near the fan clutch would clog up, that might these kinds of issues..?
Clutch seems to work fine as long as it actually receives heat. I might test this with a heat gun now that I think of it..?
1961 Simson AWO sport (Brasoveanca)
1968 BMW 114 2002
1976 BMW E12 528 (Malèna)
1987 Kawasaki GPz900r
1996 Moto Guzzi V75 PA NT
1968 BMW 114 2002
1976 BMW E12 528 (Malèna)
1987 Kawasaki GPz900r
1996 Moto Guzzi V75 PA NT
Wow, I haven't seen one of them since the one on my old E3. But think about it, there was probably a reason they discontinued it. I didn't have any problems like that because the one on mine had already been bypassed and locked on by the time I got it. Unless you are trying to keep it purely original, I would put a later fan clutch on and a 8 or 9 blade fan.
Mike W.
1980 528i, 3.5 euro, 5 speed conversion
1981 528i, 3.6, Recaros and more. Project
1998 328is, quick and efficient, but not satisfying
2000 528iit, Vacation mobile/wife's grocery getter
1980 528i, 3.5 euro, 5 speed conversion
1981 528i, 3.6, Recaros and more. Project
1998 328is, quick and efficient, but not satisfying
2000 528iit, Vacation mobile/wife's grocery getter
- Falkenberg
- Posts: 520
- Joined: Wed Nov 10, 2010 6:46 am
- Location: In Europe, far, far away.
Well the original clutch was in there from 1976 up to 2012, that would be 36 years, and covering 2 or 3 hundreds of thousands of kilometers. Not exactly what I would call a weak design. I've seen several newer viscous models go wrong - but I see their advantage, they always apply some torque to the fan, pulling air through the radiator.
I'd give it a got with a new radiator if there would be any available locally at a reasonable price.
I'd give it a got with a new radiator if there would be any available locally at a reasonable price.
1961 Simson AWO sport (Brasoveanca)
1968 BMW 114 2002
1976 BMW E12 528 (Malèna)
1987 Kawasaki GPz900r
1996 Moto Guzzi V75 PA NT
1968 BMW 114 2002
1976 BMW E12 528 (Malèna)
1987 Kawasaki GPz900r
1996 Moto Guzzi V75 PA NT
- Falkenberg
- Posts: 520
- Joined: Wed Nov 10, 2010 6:46 am
- Location: In Europe, far, far away.