What is the ideal operating temp for a OM617?
The mechanical cooling fan decided that it didn't want to be on the truck.
I'm not sure how it broke off but it was just laying on the cross member of the truck the other day, all 4 bolts sheered off.
So I decided to install an electrical fan.
The flex lite fan I installed pulls 3100 CFM.
I drove into work this morning and low RPM's the temp was a straight 180*F maybe even a little lower.
At high RPM's the engine would go to +- 195*F.
I think that is a bit to hot but any thoughts....

Thanks.

80 to 95 C. Can't help with F.

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83 SD

84 CD

About 175 to 205 F is the ideal temp.

180 running normal and 195 under load are perfect temps.

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-diesel is not just a fuel, its a way of life-
'15 GLK250 Bluetec 118k - mine - (OC-123,800)
'17 Metris(VITO!) - 37k - wifes (OC-41k)
'09 Sprinter 3500 Winnebago View - 62k (OC - 67k)
'13 ML350 Bluetec - 95k - dad's (OC-98k)
'01 SL500 - 103k(km) - dad's (OC-110,000km)
'16 E400 4matic Sedan - 148k - Brothers (OC-155k)

Thanks for the replies. Im glad the temps are in range for now. But those water temps are when it was 32*F outside. I am a little nervious for the summer... Being new to this motor, how do they handle heat in the summer?

Mine will reach 110 C in the summer months, under heavy load i.e. climbing through a mountain pass in SoCal on the way to Vegas. It'll usually sit at 80 C under normal driving.

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1982 240 D, 308,000 - 321,127 miles (sold)
1982 300 TD,166,500 - 226,000 miles
1998 E 320, 120,000 - 144,000 miles
2005 C 230 K, 26,000 - 77,000 miles (sold)

Thats too hot. You probably need your radiator cleaned or replaced. When its 90F out and I run mine hard I can barely get it over 88-90C. With my old radiator it would climb to 110 like yours does.

__________________
-diesel is not just a fuel, its a way of life-
'15 GLK250 Bluetec 118k - mine - (OC-123,800)
'17 Metris(VITO!) - 37k - wifes (OC-41k)
'09 Sprinter 3500 Winnebago View - 62k (OC - 67k)
'13 ML350 Bluetec - 95k - dad's (OC-98k)
'01 SL500 - 103k(km) - dad's (OC-110,000km)
'16 E400 4matic Sedan - 148k - Brothers (OC-155k)

The deserts and mountains of Southern California might well present challenges not easily duplicated in many parts of the country.

if all 4 bolts sheared, then what is turning the water pump??

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1984 123.193 372,xxx miles, room for Seven.

1999 Dodge Durango Cummins 4BTAA 47RE 5k lb 4x4 getting 25+mpgs, room for Seven.

Climbing the hills of PA with 1100lbs of stuff in the car, hills so steep that the pedal to the floor in 3rd only gets you to about 35-40mph uphill....outside temp in the low 90's......my car went up to 110C...with a new radiator in similar conditions I can barely come close to 90C, even pulling a trailer on a very hot day.

__________________
-diesel is not just a fuel, its a way of life-
'15 GLK250 Bluetec 118k - mine - (OC-123,800)
'17 Metris(VITO!) - 37k - wifes (OC-41k)
'09 Sprinter 3500 Winnebago View - 62k (OC - 67k)
'13 ML350 Bluetec - 95k - dad's (OC-98k)
'01 SL500 - 103k(km) - dad's (OC-110,000km)
'16 E400 4matic Sedan - 148k - Brothers (OC-155k)

I run stock thermostat for Fall thru Spring.In summer I have one with 5 holes drilled in it,for mountain high speed driving.Both Benz,and Toyota.

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1999 w140, quit voting to old, and to old to fight, a god damned veteran, deutschland deutschland uber alles uber alles in der welt

Thats very bad. If you have to mutilate the thermostat just for it to cool better then you definitely need to clean or replace the radiator.

100 degrees C shouldn't be too hot. That's the third has mark, between 80 and 120. My temp gauge will climb slightly higher than the 100 C (110 estimate) mark. It only gets that warm when climbing 3,000ish feet, with three 200lb passengers, luggage, at Hwy speed, in 100 degree desert heat.

My radiator might not be new, but it does fine. The red line is at 120 C and boilover for the coolant is a little higher. Just keep it out of the red I say.

Now that fan that sits in front of the radiator, I have no idea if that works as it should....

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1982 240 D, 308,000 - 321,127 miles (sold)
1982 300 TD,166,500 - 226,000 miles
1998 E 320, 120,000 - 144,000 miles
2005 C 230 K, 26,000 - 77,000 miles (sold)

Can a cheap-o fan clutch have anything to do with higher temps? I replaced my thermostat and water pump, both good quality, along with a cheap e-bay fan clutch and temps under normal conditions went from 80 C to 90 - 100 C. Might try replacing the t-stat with a higher quality one, or did I just mess up being cheap?

sorry to jack the thread.....

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1985 300D - 1984 Euro 280E AMG Clone (SOLD) - 1978 280CE (SOLD) - 1983 300D (SOLD) - 1981 300D (SOLD)

how about lower temps? mine runs a little below 175 most of the time.

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1980 300D, 128K

I run mine triggered at about 80*C, that's 175*F. Hasn't given me any trouble during the 115* summers in SoCal. Enjoy the extra horsepower!