fernando_say Posted June 11 Share Posted June 11 I have E7 mechanical engine and always have the fan clutch fixed, don't know how say !!! Always on, always active !!! I like to know how much save in diesel of I put fan clutch original? Quote Link to comment https://www.bigmacktrucks.com/topic/74256-fan-clutch-or-not-how-much-is-saved-in-diesel/ Share on other sites More sharing options...
Geoff Weeks Posted June 11 Share Posted June 11 I can't stand the noise of the fan running all the time. I don't know how much fuel is saved but the noise is enough for me to fix the clutch. I've had to make a few trips with the clutch locked when something went wrong, but never kept it that way. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/74256-fan-clutch-or-not-how-much-is-saved-in-diesel/#findComment-553517 Share on other sites More sharing options...
fernando_say Posted June 11 Author Share Posted June 11 4 minutes ago, Geoff Weeks said: I can't stand the noise of the fan running all the time. I don't know how much fuel is saved but the noise is enough for me to fix the clutch. I've had to make a few trips with the clutch locked when something went wrong, but never kept it that way. You use fan clutch with what temp thermostat? I have 160 degrees F, I want put it work over again but I think that thermostat 160 don't work well, ( sorry for my english ) 1 Quote Link to comment https://www.bigmacktrucks.com/topic/74256-fan-clutch-or-not-how-much-is-saved-in-diesel/#findComment-553518 Share on other sites More sharing options...
Solution Geoff Weeks Posted June 11 Solution Share Posted June 11 Engine coolant thermostat 180-190 deg F, Fan switch, 205-210 deg F. Often people who don't understand, use a low 160 deg thermostat to try and solve an overheating problem, it will not! the engine thermostat only sets the MINIMUM temp the engine can run at, above that the thermostat has no effect. 160 deg thermostat and fixed fan, tells me someone is having over heat problems and isn't dealing with the real problem but trying to "get by' without fixing the real problem, which it likely to be the radiator. The radiator only has to drop the coolant temp 10 degs F at full load, if it can do that, the engine will never over heat. The outlet of the engine at 190 (thermostat temp) and the inlet back to the engine at 180 deg. When really working hard the outlet will be 200 and the return 190, when there isn't enough air flow to drop the coolant that 10 degs the fan kicks on at 15 deg above thermostat temp or so. Overheat alarm is often set at 220-225 deg (may be higher on the newer engines.) Radiators can be expensive, but often they are the true fix. I have spent more on a radiator than I did on an engine overhaul kit ($2150 for a radiator, $1500 for an overhaul kit). 1 1 Quote Link to comment https://www.bigmacktrucks.com/topic/74256-fan-clutch-or-not-how-much-is-saved-in-diesel/#findComment-553521 Share on other sites More sharing options...
BOBWhite Posted June 12 Share Posted June 12 A fan depending on size and RPM can take 10-25 horsepower from the engine. Couldn't say how much more fuel a fan stuck on would take but it would be considerable. 2 Quote Link to comment https://www.bigmacktrucks.com/topic/74256-fan-clutch-or-not-how-much-is-saved-in-diesel/#findComment-553596 Share on other sites More sharing options...
JoeH Posted June 12 Share Posted June 12 Fan takes power from engine but also pushes you forward.... Like an airplane.Though it's probably inefficient. You should run 180°F thermostat, if the engine runs too cool unburnt fuel can gum up valves, exhaust, etc when idling. 1 1 Quote Link to comment https://www.bigmacktrucks.com/topic/74256-fan-clutch-or-not-how-much-is-saved-in-diesel/#findComment-553626 Share on other sites More sharing options...
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