| Engine Temperature Too Hot? [message #196740] |
Tue, 29 January 2013 08:23  |
Clark76
Messages: 62
Registered: February 2010
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Question: 208 degrees seems too hot to be running the engine. Since I am not used to seeing the temps with my new gauges what should normal?
NEW GAUGE READINGS: I recently installed new high quality analog gauges and matched senders to replace the “Idiot” OEM gauges on the dash – Engine Temp, Trans Temp, Voltage, Oil Pressure, Air Tank Pressure. I recently drove over 1,000 miles and noticed that my Engine Temp did not change from 208 degrees and the Transmission Temperature varied from 180 to 195 degrees (I was towing a Geo Tracker). On one long steep grade it did get up to 220 degrees and the fan clutch kicked in. On the downhill side it cooled back to 208 degrees. Drove mostly on flat land a few hills, the fan did kick in when going up a few long steep grades. Outside ambient temperature 40 to 70 degrees in January. Drove 10 hours one day with a 1 hour lunch stop, 1 gas fill-up stop and two short dog stops. This summer in a few months it will get to the 90-105 degree ambient temps.
BACKGROUND: 76 GMC 455 engine, Mobil 1 Oil (new oil and filter before trip), New Water Pump before trip, Green Radiator Fluid 50/50 (held level nicely in reservoir), original headers and fairly new exhaust system, new heavy duty fan clutch installed 6 months ago, rebuild transmission 1 year ago. New oil sending unit replaced the old sending unit. There is a supplemental small transmission radiator cooler in front of the A/C cooler which is in front of the Radiator Cooler (And yes, the transmission cooler is tied into the transmission cooler that is in the big OEM radiator so heat transfer takes place). There is a 9# radiator cap on the unit.
OTHER POSTS OF INTEREST:
I do not know what the thermostat is in the radiator, but I have seen the posts on using a Robet Shaw 330-195 balanced flow thermostat 195 degree or the 330-180 is preferred. I understand that the 9# cap raises the boiling temperature to 250 degrees with
Reference Temperature Sender: http://www.gmcmotorhome.info/engine.html
Engine Temp Discussion Threads on GMCnet: http://gmc.mybirdfeeder.net/GMCforum/index.php?rid=0&t=msg&th=17989
http://gmc.mybirdfeeder.net/GMCforum/index.php?rid=0&t=msg&th=22412
http://gmc.mybirdfeeder.net/GMCforum/index.php?t=msg&goto=129002&rid=0
http://gmc.mybirdfeeder.net/GMCforum/index.php?t=msg&rid=0&th=19404&goto=147642
http://gmc.mybirdfeeder.net/GMCforum/index.php?t=msg&rid=0&th=22163&goto=173055
http://gmc.mybirdfeeder.net/GMCforum/index.php?t=msg&rid=0&th=20462&goto=157344
http://gmc.mybirdfeeder.net/GMCforum/index.php?t=msg&rid=0&th=20239&goto=155354
GMC Cooling Issues (Installing Air Flow Modifications with Mud Flap Material) http://minniebiz.com/gmcmotorhome/2011/05/20/gmc-engine-cooling-issues/
GMC Engine Cooling System: http://www.gmcmotorhomeinfo.com/radiator.html
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