A long afternoon

[ronmarabito2002]

Bob: My oil temperature runs there all the time.

R.E. (Ron) Marabito, Dallas, TX 92WB40

--- In WanderlodgeForum@yahoogroups.com, Robert Johannesen wrote:
>
> Thanks, Leroy - sounds like we have gone through the same thought processes. I
will check it soon. As an aviator myself, 230 degrees of oil temp bothers me!
> Bob J
>
>
>
>
> ________________________________
> From: Leroy
> To: WanderlodgeForum@yahoogroups.com
> Sent: Sat, March 6, 2010 8:08:21 AM
> Subject: [WanderlodgeForum] Re: A long afternoon
>
> Â
> The Alarmstat is located on the left hand side of the water pump in the water
jacket of the engine on my coach. It is a bulb looking instrument with two wires
attached to it. The original had screws attaching the wires attached to it. The
replacement has slide on connections. If it has not been painted it may have the
name Kysor on it. The temp range is stamped on the hex part of the instrument.
BB part number for the 190 version which means nothing except for reference
purposes is 1594951. You can see one at http://www.medallionis. com under switches,
senders and sensors, pn 1002-07478-30. The NC version.
>
> As for oil temp mine runs in the 215- 230 range but is affected by OAT,
radiator water temp and road speed. I have messed with that also. My
understanding is there are two Detroit oil coolers which bolt onto the left side
of the engine. They have a different number of cooling plates. It is cooled by
the radiator water. So reduction of the average water temp reduces oil temp but
only by about 5-8%. In winter my oil temp will run about 215 at 62mph. In summer
is runs 230 at the same speed simply because the average running water temp
increases. The only way to reduce oil temp would be to add an oil cooler. My
conclusion on that issue has been I have not done it. If I did, I believe the
way to do it would be to somehow have the pick up on the pressure side off the
main oil filter cycling oil to a separate air cooled cooler and dump the cooled
oil into the pan which would then reduce overall pan oil temp before it is
reintroduced onto the main oil pump pick
> up. Or have a larger engine oil cooler which is water cooled built. Probably
cost prohibitive.
>
> I have had lengthy discussions with BB and Detroit. Detroit did not spec the
Alarmstat in BB engines. BB engineers did and I was never able to determine why
it was installed in the first place but speculate it was intended to have the
fan idle to prevent dust from blowing all over creation, including being
inducted into the fins of the radiator while operating off the highway at slower
speeds.
>
> As a practical matter, the Alarmstat forces temps to run higher than I like.
While it is important to heat up the oil to remove moisture this is accomplished
at 180-200 or 230. In aircraft, oil temp typically runs 180-190 and all is well.
>
> So, in the summer I personally run my coach on fan override after I get on the
highway and that keeps temps at a solid 190 on the water and around 220-230 on
the oil. I simply shut off the fan override before leaving the highway and let
the alarmstat control things them. In winter I allow the Alarmstat to do its
thing.
>
> I know, the fan supposedly robs horsepower. I have not been able to prove that
either using the computer. Besides, I have a solid argument regarding horsepower
and that fan which I will not go into indepth here. It is simple. On the flat
you are not using the HP. Climbing the mountain it is not available because the
fan is on high: That assumes the HP rob was there in the first place.
>
> Hope this gives you some insight into the ops.
>
> --- In WanderlodgeForum@ yahoogroups. com, Robert Johannesen wrote:
> >
> >     Leroy, I would like to know also! Thanks for your response.
> >
> >     Where is the alarmstat for the fan normally located? I will
check and see what its setting is. My goal was to have all the engine temps
run lower. My oil temp is now about 230 constantly.
> >     I will go back an read my maintenance log to refresh my
memory, because it has been about 10 years since I tried the change. I remember
being very disappointed. I know I didn't change my alarmstat for the fan because
I didn't realize I had one. It is probably in the hydraulic circuit between the
pump and the valve that opens the flow and maybe I can read the setting on the
device itself.
> >     I will go back and research the system (I think I have the
applicable BB prints) again because I do want it to run cooler (Oil temp and
water temp) if possible. I am also not opposed to designing an in line oil
cooler. Having it closer to the water temp is OK with me. My heat exchanger
for the Oil and water is so close to the frame on the left side of the block
that it cannot be removed to inspect or examine it.
> >      I may set up and try my alarmstat the way you did
since you seem like it that way and your temps are very reasonable.
> >     Will let ya'll know. Going back to VaBch next month so I
may get it done and check it before then.
> > Thanks, Bob J.
> >
> >
> >
> > ____________ _________ _________ __
> > From: Leroy
> > To: WanderlodgeForum@ yahoogroups. com
> > Sent: Fri, March 5, 2010 4:34:57 PM
> > Subject: [WanderlodgeForum] Re: A long afternoon
> >
> > ÂÂ
> > I am interested in this engine thermostat phenomenom. I messed with my
cooling system for months and found a combination that works well for me.
> > The engine thermostats do not control the fan cycles on my coach. I don't
believe they do on yours. Could be wrong. An separate system incorporating an
Alarmstat does that. Stock Alarmstats were 195 degrees with an approximate 8-10
degree spread. The fan cycled to high at 203-205 and back to about 193 at fan
idle. I run a 190 degree Alarmstat with 180 degree thermostats. I can see the
movement on the gauge and the VMSpc. My spread is between 188 and 195 depending
on OAT. If I run my fan on override it holds at 180 in winter and 190 in summer.
> > I sure would like to know how your fan is configured and why it would be
cycling after you changed thermostats. If it ran 170 all the time it should
never cycle but remain in idle or about 500rpm.
> >
> > --- In WanderlodgeForum@ yahoogroups. com, Robert Johannesen ...> wrote:
> > >
> > > I dropped my thermoststs to 170s for about 6 months and the fan
kept cycling on and off so often I went back to stock after talking to Detroit.
I probably still have them if you want to try them on your rig.
> > >
> > > ÂÂÂ
> > >
> > >
> > >
> > > ____________ _________ _________ __
> > > From: ronmarabito2002
> > > To: WanderlodgeForum@ yahoogroups. com
> > > Sent: Sun, February 28, 2010 1:58:50 PM
> > > Subject: [WanderlodgeForum] Re: A long afternoon
> > >
> > > ÂÂÂ
> > > Mike: Why do you want to change thermostats to 170's? Good heat without
overheat makes the engine run better and more efficiently. I think 180's is cool
enough.
> > >
> > > R.E. (Ron) Marabito, Dallas, TX 92WB40
> > >
> > > --- In WanderlodgeForum@ yahoogroups. com, "mbulriss" <mbulriss@ .> wrote:
> > > >
> > > > I spent all afternoon (into the early evening) opening up the bed and
then the innards to be able to replace alternator #1 - one more time. In mine, I
also have to work around all the plumbing, which was conveniently installed in
the way of the engine hatch! After opening the floor, you can't even see the
alt!!! I have to stand on the tranny and kind of remove the alt by feel. I
bought a new one and replaced it. Not going to screw around rebuilding the old
one again - 7000 miles since the last time has soured me on rebuilds. Besides,
the new one was the same price as the last rebuild. This is really not a fun
job.
> > > >
> > > > After I finished installing the alt, I then installed a replacement
turbo intake tube that I found in a 'reclamation center' (aka: truck junk yard)
to replace the one that broke in South Padre. The weld job did not hold up. If
you want a good laugh, I called Detroit to see about getting a new one, because
I really wanted a new one. When I heard $500 for a piece of exhaust pipe, I
decided to try to find a used one. If anyone knows of a place to get part number
5101394 (yup, it's stamped right on it) for way less than $500, let me know
please. And I used to think Harley parts were high dollar!
> > > >
> > > > Man, I am beat up and sore all over! I left the floor open as I want to
remove the 'infamous' coolant hoses to the air pump tomorrow. At least that's
the current plan. I realllllly am not looking forward to that job! I think I
will replace them with braided stainless steel hoses so I never have to do it
again!
> > > >
> > > > While I was having fun, the wife pulled each screen window and washed
them, did the Invisible Glass cleaning on each window, and then scrubbed each
window track and silicon lubed them. They slide open really nice now.
> > > >
> > > > It seems my to-do list just keeps growing without getting shorter! Is it
just me? I want to change the thermostats to 170s. I need to rebuild the Gast
air pump. I have service the air dryer on the list. I plan to pull the electric
heaters to clean them out. And on and on..... And I haven't even started on the
wife's list of modifications yet! I keep wondering: Are we having fun yet?
> > > >
> > > > Long day..... having fun.
> > > >
> > > >
> > > > Mike Bulriss
> > > > 1991 WB40 "Texas Minivan"
> > > > San Antonio, TX
> > > >
> > >
> >
>