Temps

[Rob Robinson]

Mike if your radiator grill is like mine you will have two screws latches at the top which are turned with an Allen Key. Sometimes the paint is thick in the screw heads so look closely and you should see the octangal shaped holes. You loosen these counterclockwise and lift the grill cover UP and OFF. It hooks on at the bottom while the two screw latches at the top keep it in place

2008/6/18 Mike McMahan <"mmcmahan@hot.rr.com">:

Thanks everyone for the responses. Pete you were right about the
retarder. I guess my old age and senility set in and helped me to
get my two coaches mixed up. I had not verified what the second
small radiator(it does have two electric fans mounted on it) did.

I'm going over to the bus this afternoon and will look. I have not
ever removed the outer grill that covers the radiator. If memory
seves me correctly the only fastener that I see on the outside of the
grill is a pop rivet at the top. What is the procedure for removing

the grill to clean the radiator? Thanks again, MIke Mcmahan 96 42'
Wanderlodge

--- In "WanderlodgeForum%40yahoogroups.com", Pete Masterson

wrote:
>
>
> ===============================================
> Pete Masterson, Author of
> Book Design and Production: A Guide for Authors and Publishers
> Aeonix1@...
> Aeonix Publishing Group http://www.aeonix.com

> ===============================================
>
>
> On Jun 17, 2008, at 10:46 PM, Glenn Allen wrote:
>
> > Pete,
> >
> > Good Summary. Can you or someone elaborate on the following

> > questions I have about the areas of your post noted below relative
> > to a 1986 PT-40 6V92.
> >
> > Thanks,
> >
> > Glenn....(see questions noted below your comments):

> >
> >> The transmission cooler is in the bottom of the
> >> water radiator. The other radiator you see is not the
> >> transmission cooler. (I don't think it even has a fan.) The air

> >> flow through the transmission cooler is from the main radiator
> >> fan.
> >
> > 1a) There is a small radiator attached on the outside bottom left
of
> > the main radiator that has hoses running to the power stearing

fluid
> > cannister. I assume this small radiator is cooling the fluid for
> > power stearing and the hydraulic fan. There is also a round
> > cannister down low that is between the driver's side of the engine

> > and the main radiator with large diameter (3"+) hoses from the
> > radiator and engine. There are also lines from the transmission.
> > I'm assuming this is the transmission heat exchanger. I would

> > assume water is flowing from the bottom of the radiator to the
> > transmission cooler and then to the engine. Is this correct?
>
> I'd have to go out to the coach and take a look. I don't recall

the
> "canister" you mention (it might be there, but I don't recall it).
> The bottom (1/4 or so?) of the water radiator is a radiator for
the
> transmission fluid. When my radiator core was removed, there was a

> 'stub' radiator for the transmission fluid. The new core attached
> above it. I no longer recall if water moved through some of the
tubes
> and transmission fluid moved through the other tubes or exactly

what
> the physical arrangement was.
>
> The second small radiator is for cooling the power steering (and
may
> cool the hydraulic fan fluid as well). The power steering
reservoir
> is a large canister on the curb side visible through both the rear

> and side doors. Do not overfill it. If you do, it will coat
> everything nearby with oil. (And I'm not going back to that place
for
> service again.)
>
> The fan pulls air through a 'stack' of radiators. You can remove

the
> grill on the street side and you'll see (I'm going by memory here,
so
> bear with me) the AC condenser, and the Air Charge cooler. Behind
the
> air charge cooler is the regular water radiator with the

transmission
> radiator in the bottom portion of it. You can't see the water/
> transmission radiator since it's fully covered by the Air Charge
cooler.
>
> Looking from the inside, you mostly see the fan and the metal

shroud
> that makes the fan more efficient.
>
> > 1b)I notice on this transmission cooler there are plugs on each
> > end. Do these plugs drain the water or transmission fluid from
the

> > heat exchanger (or maybe both)?
>
> Afraid I don't know. I have a 400+ page DD Series 60 manual (as a
> PDF). Perhaps I can make a copy available to you if you'd like. (I
> bought a CD with it on eBay.) I don't know if this manual

discusses
> the radiator set up in the coach (bus) as it's mostly focused on
> heavy truck installations. More likely this is covered in Allison
> documentation -- I don't have any of that stuff beyond the owner's

> manual.
>
> >
> > 1c)Should this transmission cooler be cleaned or serviced?
>
> The transmission fluid filters should be changed every 36 or 48
> months depending on the size of filters you have. (I have to check

> this.) These are located in the transmission 'pan'. When the
filters
> are changed the transmission fluid is also changed. Use a
synthetic
> transmission fluid (I have Transynd). I don't think there's any

> specific service required for the cooler itself. You change the
> transmission fluid on the same interval as the filters. With an RV
> you're going to probably "time out" rather than exceed the

suggested
> miles.
>
> Change the engine oil (and filters) every year or 15,000 miles,
> whichever comes first. A full oil change will take nearly 40
quarts
> (10 gallons) of oil. You can use a synthetic, if you wish, but the

> change interval is the same. I have Rotella or Delo for heavy duty
> diesel engines.
>
> There is a canister on the curb side that holds about 3 gallons of
> oil and there's an automatic oil add system (requires air pressure

to
> operate), if needed.
>
> >
> >> I think it comes on at 190 or so ... or whenever you turn on
> >> the "fan override" switch
> >> or turn on the dash AC.

> >
> > 2a) I believe my fan is "always on". When the engine temp is
cool,
> > the AC is off, and the fan override is off, should the fan be
> > turning at idle speed or stationary?

>
> The fan should be not turning or turning very slowly at idle speed
if
> the engine isn't fully warm. They fan will run at full speed if
> _either_ the "fan override" or AC switch (the little button on the

> automotive heat control panel) are on.
>
> >
> > 2b) Is the speed of the fan proportional to the engine RPM?
>
> Not that I'm aware of. I think it has two or three speeds.

Frankly,
> I've never paid much attention to the fan when it was operating.
I've
> verified that it works and I've seen the clouds of dust it kicks
up
> when it's on, though.

>
> >
> > 3b) Where is the relay that the fan override switch controls?
>
> Front load center, SK 68 is the fuse. Relay K39 says "Chassis A/C
> Eng. Fan Enable" -- I don't see any other relay related to the Fan.

I
> suppose that the fan override switch tickles the same relay as the
AC
> switch.
>
> There area two other main Load Centers. One is behind the cabinets
> above the dashboard (on the right). The cabinets have a false back

> that pulls out, revealing the TV aerial wires and a load center.
> There's also a load center in the rear closet on the street side
> behind a felt-covered door.
> >
>

--
Rob, Sue & Merlin Robinson

94 WLWB