8v92 temperature

[Leroy Eckert]

I do not know what year Alarmstat electric controls were first installed by BB.
By reading posts on this and other forums apparently some earlier fan controls
were air operated. I have personally seen two coaches without either one. Mine
is a DDEC II and has an Alarmstat. The factory setting was 195 degrees. The
typical Alarmstat has an operating range of 8-10 degrees. I changed mine to 190
degrees some time ago. With the chassis air and the fan override off, the
temperature will cycle. There will be a noticeable difference in Winter due to
OAT being lower. In Summer the temperature should remain stable at about 190
degrees simply because the road surface temperature may not allow radiator water
to be cooled to the cut in point of the Alarmstat.(ie. the fan is constantly in
high mode.) In any case, if the fan override or the chassis a/c is on the fan is
always in high mode. Temperatures should remain stable in this configuration
until significant loads are introduced. Water
temperature on different coaches with the same Alarmstat configuration could be
as much as 5 degrees different depending on the placement of the chassis a/c
condenser (mine covers most of the front of the engine radiator, others are on
top of the bus with separate fans), how clean the radiator is and other factors.
I recently found from another owner that the fan is controlled by the DDEC
control unit on units with DDECIII configuration.Probably a later model Series
60.
If all works according to the book, mine will alarm at 210 degrees and shut down
a 215 degrees.
The real key is the engine oil temperature. It is controlled by the water temp.
All that being said, mine runs normally between 185 and 193 on the VMSpc. With
the fan override on I can see stable temperatures in Winter in the 178 degree
range. Summer between 188-190 with the chassis a/c on.
Hope this helps.
Leroy Eckert
1990 WB-40 Smoke N Mirrors
Dahlonega, GA

Scott Forman <sforman@...> wrote: 8v92
owners...what temp does your engine run when cruising?

Mine hovers around 190. When it creeps a bit past the 190 line on the
gauge, I assume the fan kicks in, and it cools to just below 190 on the
gauge. Then it heats back up and the process is repeated.

Is this similar to other owners' experiences?

Scott Forman
86 PT38
Memphis






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