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Re: [GMCnet] Fan Clutch [message #61612 is a reply to message #61580]

Sun, 25 October 2009 17:38

Tin Gerbil

Messages: 236
Registered: October 2006
Location: Vancouver Island, B.C.

Karma:

Senior Member

Emery Stora wrote:
Another potential problem with running too low an engine temperature
> is that any condensation in the engine block must be evaporated by
> the heat of the engine to prevent the water from floating around in
> the oil pan and being picked up by the oil pump and getting into the
> bearings, etc. Water is not a good lubricant. It also will rust
> parts in the engine block.

What water boils off significantly faster at 195* than at 185*? What we
need to pay attention to is the oil temperature, which on the bottom of
the pistons, is at least 50* hotter than the water temperature. We are
looking at 235* VS 245*, both of which will take care of any
condensation. I guess it is conceivable that if one is using their GMC
as a grocery getter and only going 10 blocks to the store, with ambient
air temperature of 0*F, the build up of condensation could occur with
either a 185* or 195* thermostat, THAT NEVER OPENED? If the engine
water temperature never got over 150* condensation will build up. This
was a damaging factor with a propane powered 1978 GMC Suburban grocery
getter using a 160* thermostat. The oil was always clean so I seldom
changed it. The acid built up and ate the main bearings. Luckily it
burned a valve before the crank went. This is when I went back to using
Litmus paper on dipsticks of propane powered vehicle and on engines with
FRANZ oil filters that keep the oil clean for 25,000 miles.

With normal use of a GMC, the entire idea of water rusting an engine
because of a 185* thermostat is just a little silly. Yes, I also
realize no one ever said such a thing. Just broad meaningless, mixed up
statements as in "too low", "higher temperatures", "high temperature
thermostats",etc. It is very hard to understand if you are speaking of
water temperature or oil temperature? You seem to use them
interchangeably?
I have drained the oil from engines which have sat abandoned, unused for
20+ years. There was no sign of water in the oil pan. There was fly
rust on the crankshafts, in the blocks and rust on the valve trains. No
sign of rust in the rings, bearings or the wrist pins. I currently have
a 1979 Moto-Ski snowmobile with 300 original miles on it that was
abandoned in 1980. I'm now very anxious to open it up to see what it
looks like inside. The blackberry vines were 8' high over it and have
grown into the seat. I will look very carefully for water collected in
the dry sump of this 2 cycle engine. There is also a 1979 Honda CBX
1000 (13,000 miles) abandoned in 1980 and a 1984 Honda 450 (1200 miles)
abandoned in 1985. The CBX is seized but the 450 runs well after I
cleaned the carbs and fuel tank. Too many opportunities!

Gordon "From the Cold Damp North, 185* thermostat, with no sign of rust
in the valve covers or water in the oil"

> On Oct 25, 2009, at 12:05 PM, The Tin Gerbil, Ad Nauseum wrote:
>>
>> Some people mistakingly believe that a 185*F thermostat will cause
>> moisture to accumulate in the oil.
>
> Strange, but I have never heard anyone say that.
> What I and others have said was that a 195 deg temperature will take
> the moisture out of an engine quicker than 185 deg.
>
> Emery Stora
> 77 Kingsley
> Santa Fe, NM
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Gordon '74 Canyon Lands "Tin Gerbil" Vancouver Island, B.C.

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[Message index]

		[GMCnet] Fan Clutch By: USAussie on Wed, 21 October 2009 22:36
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		Re: [GMCnet] Fan Clutch By: Rick Denney on Thu, 22 October 2009 00:33
		Re: [GMCnet] Fan Clutch By: Tin Gerbil on Thu, 22 October 2009 00:49
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		Re: [GMCnet] Fan Clutch By: Tin Gerbil on Thu, 22 October 2009 10:54
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		Re: [GMCnet] Fan Clutch By: Tin Gerbil on Fri, 23 October 2009 00:44
		Re: [GMCnet] Fan Clutch By: Ken Burton on Fri, 23 October 2009 01:43
		Re: [GMCnet] Fan Clutch By: Tin Gerbil on Fri, 23 October 2009 09:28
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		Re: [GMCnet] Fan Clutch By: USAussie on Fri, 23 October 2009 18:31
		Re: [GMCnet] Fan Clutch By: Rick Denney on Sat, 24 October 2009 01:35
		Re: [GMCnet] Fan Clutch By: USAussie on Sat, 24 October 2009 02:47
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		Re: [GMCnet] Fan Clutch By: Tin Gerbil on Sun, 25 October 2009 13:05
		Re: [GMCnet] Fan Clutch By: emerystora on Sun, 25 October 2009 13:29
		Re: [GMCnet] Fan Clutch By: Tin Gerbil on Sun, 25 October 2009 17:38
		Re: [GMCnet] Fan Clutch By: emerystora on Sun, 25 October 2009 18:02
		Re: [GMCnet] Fan Clutch By: Tin Gerbil on Sun, 25 October 2009 18:51
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		Re: [GMCnet] Fan Clutch By: Tin Gerbil on Thu, 22 October 2009 10:23
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		Re: [GMCnet] Fan Clutch By: Ray Erspamer on Fri, 23 October 2009 13:12
		Re: [GMCnet] Fan Clutch By: Tin Gerbil on Fri, 23 October 2009 13:16
		Re: [GMCnet] Fan Clutch By: Ray Erspamer on Fri, 23 October 2009 13:43
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