Over heating 6V92

[Tom Warner]

Jay here is the procedure from my Detroit Diesel factory manual. I
would do the leakage test on it first

Tom Warner
Vernon Center,NY
1985 PT 40



At 11:50 PM 7/1/2006, you wrote:
>Jack(and the rest of the gang here),
>
>I removed both thermostats from the 6V92.
>
>Threw them and thermometer, along with 1 of the new thermostats, in a
>pan of water on the stove. When the water temp was 178 degrees, the
>new thermostat began to open. The old thermostats remained closed up
>to 190 degrees. The thermostat from drivers side required 205 degrees
>to open and then it didn't open very much, maybe 1/3 as much as the
>new thermostat. The passenger side thermostat opened at 190 degrees
>but only about 1/2 as far as the new thermostat.
>
>Found a heater hose that is located along the passenger, outer frame
>rail, just forward of the drive tires had a little leak. I guess that
>lost enough coolant to cause the water pump to cavitate and not move
>coolant.
>
>I received an e-mail from Tom Warner who indicated that if the temp
>were to exceed 195 degrees, its bad for them. Something about sleeve
>seals... I need to look into that. I have been to 200 degrees thru the
>desert and the mountains many times.
>
>The oil level is correct, no signs of anti freeze. The antifreeze
>looks good, no signs of oil.
>
>Is there a trick to refilling the coolant so as not to have air
>pockets in the coolant?
>
>If you have, yourself, flushed your cooling system and refilled it, I
>would like to hear of the procedure.
>
>Thanks AGAIN!
>
>Jay Darst
>85PT40 6V92 MTB654CR
>Springfield, IL


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