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#1
11-19-2013, 03:45 PM
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engine temperature maxing out at 70 C...?
even after vigorous driving my cluster only indicates an engine temp of about 150 F. i checked the block with an infrared thermometer, and sure enough, 68 C. on this basis i think the sensor and gauge are working. getting up to temperature i have no questions about, i have just read so many posts about temperatures north of 90 C that this low reading confuses me.
my (W126) radiator fan appears to run nonstop. would a failed viscous clutch have this effect on temperature, or is something else likely to be afoot? do i actually have a problem? thanks for any tips.
__________________
'77 240D, 504H, OM617.952, etc. 
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#2
11-19-2013, 03:48 PM
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Bad thermostat is a good possibility.
__________________
14 E250 Bluetec "Sinclair", Palladium Silver on Black, 153k miles 06 E320 CDI "Rutherford", Black on Tan, 171k mi, Stage 1 tune, tuned TCU 91 300D "Otis", Smoke Silver, 142k mi, wastegate conversion 19 Honda CR-V EX 61k mi Fourteen other MB's owned and sold 1961 Very Tolerant Wife
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#3
11-19-2013, 03:48 PM
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^ Agreed.
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83 SD 84 CD
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#5
11-19-2013, 05:16 PM
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Be very very careful with the bolts, they have a nasty habit of breaking off with little provocation.
__________________
The OM 642/722.9 powered family Still going strong 2014 ML350 Bluetec (wife's DD) 2013 E350 Bluetec (my DD) both my kids cars went to junkyard in 2023 2008 ML320 CDI (Older son’s DD) fatal transmission failure, water soaked/fried rear SAM, numerous other issues, just too far gone to save (165k miles) 2008 E320 Bluetec (Younger son's DD) injector failed open and diluted oil with diesel, spun main bearings (240k miles) 1998 E300DT sold to TimFreeh 1987 300TD sold to vstech
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#6
11-19-2013, 06:33 PM
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On your second note, a viscous coupled fan always spins but the degree of coupling to the engine varies based on the temperature of the air coming through the radiator.
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-Evan Benz Fleet: 1968 UNIMOG 404.114 1998 E300 2008 E63 Non-Benz Fleet: 1992 Aerostar 1993 MR2 2000 F250
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#7
11-19-2013, 06:35 PM
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very good, that was an easy fix. the only hiccup was figuring out that my thermostat housing was original to the chassis, so i had to reuse the old O-ring instead of the brand new gasket with the stub protrusion. i took the opportunity to reroute another heater hose and spill coolant all over my alternator. happy day!
so, now it gets up to 90ish C much more quickly, and i am more happy too. i was incorrectly assuming that the thermostat opening temperature was much lower than it actually is (80 C). thanks folks!
__________________
'77 240D, 504H, OM617.952, etc.
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#10
11-19-2013, 10:02 PM
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hi trudge, i bought it from pelican parts. they have several from different brands, but as far as i can tell, the main difference is whether they have the old or new style of gasket (does the vernet one come with both?). the one i got was wahler brand.
__________________
'77 240D, 504H, OM617.952, etc.
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