Re: Ah man...what's next...Kid and 450D

Posted by P Backus on December 05, 2005 at 17:29:13 from (69.128.32.197):

In Reply to: Re: Ah man...what's next...Kid and 450D posted by Mr Bill No. Mn. on December 05, 2005 at 16:17:08:

Hi Mr Bill,
This is one of my pet subjects. Any engine, when running, is
creating heat, but the coolant is constantly circulating, taking
away the heat. When your engine is working the coolant may
200 degrees, but the iron around the combustion chamber is
much hotter. When an engine is allowed to idle for a while after
working, the coolant can take away the heat and equalize the
temps in the head and block. Also the oil circulating does a fair
amount of cooling of the bearings and pistons. Engines,
especially diesels, don"t create much heat when idling. IF it is
shut off right after working, all that heat has nowhere to go and
kind of builds up unevenly, causing some parts to get hotter
than they ever would while running. Did you ever see a cooling
system boil over when shut down hot?
Now the IH diesels that start on gas, run on diesel were
notorious for cracked heads, especially from shutting down hot,
or not being allowed to warm up before hard work. For some
reason the design of the head couldn"t handle the sudden wide,
uneven temp swings. So much so that it"s hard to find a head for
an MD or WD-9 that"s not cracked.
I"m fussy about warming up/cooling down ALL my engines. I"ve
got two pickups, one with 440,000 miles, the other with
300,000 miles, neither of which ever needed engine work.
Farmer friends of mine that are fussy about that as well seem to
be able to get 10,000 hours or more out of their tractor engines.
Other farmers that I"ve worked for don"t pay any attention to that
and often end up having to rebuild engines at 4, or 5,000 hrs. or
less. I"m not saying that it"s the only factor in engine longevity,
but I"m convinced that it"s a major one!
Sorry for the long post, but it"s something I feel strongly about!
Paul

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