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#1
06-13-2007, 07:33 PM
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Are these observed temps possibly right??
My 350SDL has been running around 100-105, so I took my Fluke IR temp tester and checked the temp of the fan clutch. At 300 degrees F it spun freely, thus I am thinking that it is dead. There was absolutely NO resistance to the free wheeling of the blade.
Having done that, I checked some spots around the top of the engine: upper radiator hose 312 degrees, water outlet to upper hose 299 degrees, air intake 119 degrees, IP, 203 degrees, exhaust manifold 475 degrees. top of radiator 295-304 degrees. I think the IP, exhaust and air intake manifold are about what you would expect, but not those hi temps for the cooling system. Through all of this, the temp gauge indicated 100+/- degrees. What gives??
__________________
71 220D 169K wrecked 83 240D 118K sweet 4 speed 91 350SDL (one of the 60% good engines) 156K 84 300d (loaner to my sister) 189K 79 300SD (partswagen) 86 420SEL partswagen 70 220d (partswagen) 68 280s GASSER!!! under construction now 85 300sd 310K miles winter beater car retired 93 300d 2.5 turbo 168K wife's car 83 280SL euro 5 speed 155K 69 250S newest project 54K 
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#2
06-13-2007, 09:05 PM
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Your fluke is due for calibration.
If the water outlet were 299degrees F, I believe it would be boiling with a 14psi cap.
__________________
 Gone to the dark side - Jeff
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#3
06-13-2007, 09:19 PM
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Recalibrate. At those temperatures, your coolant would be boiling over.
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#4
06-13-2007, 09:22 PM
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Quote:
In my opinion all the observations (even the exhaust manifold) are implausible.
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#5
06-13-2007, 09:42 PM
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I have to ask- you do realize that the dash gauge is C not F, right?
I agree though, temps in the 300F range are too high. Can't be right-You would be boiling over.
__________________
'83 300D Turrrbo 295K miles  
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#6
06-14-2007, 10:39 AM
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Seems like your fan clutch and your Fluke are bad and your temp gauge is alright. Change the fan clutch and recalibrate the Fluke (or don't use it anymore
 ). The non-working fan clutch is likely causing the higher than desirable temps.
__________________
1983 M-B 240D-Gone too. 1976 M-B 300D-Departed. "Good" is the worst enemy of "Great".
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