Fan Shroud/ heater T's

[dick kennedy]

I got to looking at my fan shroud this evening. It stops just an inch or so
ahead of the fan blades. I would expect it to extend so at least a portion
of the blades are inside. Is this how it was designed or am I missing a
critical piece? Can someone fill me on what the shroud is supposed to look
like? Maybe this explains the vapor lock.

Also my lines from the engine to the hot water have been cut. There were
apparently T's in the heater hoses at some point but they're gone now. Can
somebody explain to me where the original T's were placed?

As it is one of the lines is 5/8 and the other is 3/4. The hose I'm
adapting is all 5/8 so I need a source for the T's. I haven't been to
hardware store to look but I think standard sizes are just 1/2 and 3/4 . I
assume standard plastic pipe fittings will work ok if I get the sizes to
match. Somebody flag me if this isn't correct. Anyway has somebody been
here before that can save me some time?

Also ordered AC hoses and fittings from ACME today. He told me that ACME
had bought out ARA a few years back. Then when I mentioned I was updating a
GMC he told me he was familiar with Cinnabar and Buskirk.

Will appreciate any inputs someone can give me.

Thanks

Dick

 

[bartz paul]

Dick:

Based on mine, you've got a 'dutched up" shroud. Of course I believe yours
is a 73 and mine is a 78, so maybe there was a change. On the other hand, I
seem to remember that the first couple years production may not have had a
shroud. My fan sits inside the shroud opening a bit. At this hour of the
day, I didn't go out to the coach to measure how much, but going on my
recollection.

In case you're looking for one, Frank Jenkins from FL, makes and sells a
fiberglass shroud.

As to your "T's", mine are "Y's", and located to the top right front side of
the engine. Try contacting Bounds/Buskirk-Rush/Cinnabar/Sirum for the
fittings.

Curious what a set of A/C barrier type hoses cost. Cinnabar was asking
~$200.00 last I new. I know an individual who had a place in Florida make
up a set for ~$75.00 this past March.

Paul Bartz

From: Dick Kennedy
Sent: 6/22/99 11:22 PM
Subject: GMC: Fan Shroud/ heater T's

I got to looking at my fan shroud this evening. It stops just an inch or
so
ahead of the fan blades. I would expect it to extend so at least a
portion
of the blades are inside. Is this how it was designed or am I missing a
critical piece? Can someone fill me on what the shroud is supposed to
look
like? Maybe this explains the vapor lock.

Also my lines from the engine to the hot water have been cut. There were
apparently T's in the heater hoses at some point but they're gone now.
Can
somebody explain to me where the original T's were placed?

As it is one of the lines is 5/8 and the other is 3/4. The hose I'm
adapting is all 5/8 so I need a source for the T's. I haven't been to
hardware store to look but I think standard sizes are just 1/2 and 3/4 .
I
assume standard plastic pipe fittings will work ok if I get the sizes to
match. Somebody flag me if this isn't correct. Anyway has somebody been
here before that can save me some time?

Also ordered AC hoses and fittings from ACME today. He told me that ACME
had bought out ARA a few years back. Then when I mentioned I was
updating a
GMC he told me he was familiar with Cinnabar and Buskirk.

Will appreciate any inputs someone can give me.

Thanks

Dick

 

[dick kennedy]

Rick

The keyword 'engine block heater' was what I needed to know. Asking for a Y
would probably draw a blank. On that vein I twice asked the NAPA guys
about T fittings to fit the AC lines and drew a blank. Then someone informs
me that NAPA has a TEMP catalog which is full of those fittings. I then
called to see if they could get me the catalog and was told they had one
but I couldn't have it. Kokomo must be the worst place in the whole world
to try to find oddball parts.

On the heater hoses, I think the line from the water pump end is the supply
and the line to the rear of the block is the return. I also think the
heater comes off before the thermostat. If this is true then the Shutoff
going to the heater is in the return line. Without looking inside the
water pump I don't know for sure. Does anybody know for sure? Minor point;
but interesting.

Thanks

Dick

>
>> Also my lines from the engine to the hot water have been cut. There were
>> apparently T's in the heater hoses at some point but they're gone now. Can
>> somebody explain to me where the original T's were placed?
>>
>> As it is one of the lines is 5/8 and the other is 3/4. The hose I'm
>> adapting is all 5/8 so I need a source for the T's. I haven't been to
>> hardware store to look but I think standard sizes are just 1/2 and 3/4 . I
>> assume standard plastic pipe fittings will work ok if I get the sizes to
>> match. Somebody flag me if this isn't correct. Anyway has somebody been
>> here before that can save me some time?
>
>Dick,
> One tee was in the heater supply hose on the right rear of the engine.
>This hose takes hot water from the rear of the right cylinder head and sends
>it forward to the heater. The tee was just about a foot from where it left
>the head. The other tee was (of course) in the heater return hose, up near
>the front of the engine, just about 1 - 1 1/2 feet before that hose connects
>to the water pump. From there, the water heater preheat line runs rearward
>together with the existing heater supply hose, until both preheat lines arc
>off towards the right (passenger side) rear corner of the engine
compartment,
>then down and back inside the rocker panel, etc. There are some top view
>engine pictures in the owner's manual and maintennance manual that may help.
> The tees were there on my coach, so I didn'ty have to buy them, just the
>hoses and supports. All the preheat hosese on mine are 5/8" ID, a common
>size. I would be afraid to use standard plastic fittings, as I don't think
>they would withstand the 200 deg. F temperatures involved. When I wanted to
>tee into my system for auxiliary heaters, I ordered brass "Y" fittings from
>NAPA. (They are made for installing engine block heaters.) Not real
>expensive IIRC.
> Good luck, HTH.
>
>Rick Staples
>'75 Eleganza
>Louisville, CO
>
>
>
>

 

[ron & gina]

Hi Dick

I have a 73 and the fan is completely covered about an inch inside the
shroud. The shroud is plastic(on rad. side) which is in front of fan and
there's a rubber shroud that is riveted to plastic shroud and also attached
to engine with 2or3 brackets. this rubber part is what covers fan blade. As
for the "t" I don't know mine is disconnected also. Hope this helps.

Ron&Gina
73 Pumpkin-Rose
Fort Mohave, AZ

- -----Original Message-----
From: Bartz, Paul
To: 'gmcmotorhome'
Date: Tuesday, June 22, 1999 9:07 PM
Subject: RE: GMC: Fan Shroud/ heater T's

>Dick:
>
>Based on mine, you've got a 'dutched up" shroud. Of course I believe yours
>is a 73 and mine is a 78, so maybe there was a change. On the other hand,
I
>seem to remember that the first couple years production may not have had a
>shroud. My fan sits inside the shroud opening a bit. At this hour of the
>day, I didn't go out to the coach to measure how much, but going on my
>recollection.
>
>In case you're looking for one, Frank Jenkins from FL, makes and sells a
>fiberglass shroud.
>
>As to your "T's", mine are "Y's", and located to the top right front side
of
>the engine. Try contacting Bounds/Buskirk-Rush/Cinnabar/Sirum for the
>fittings.
>
>Curious what a set of A/C barrier type hoses cost. Cinnabar was asking
>~$200.00 last I new. I know an individual who had a place in Florida make
>up a set for ~$75.00 this past March.
>
> Paul Bartz
>
>From: Dick Kennedy
>Sent: 6/22/99 11:22 PM
>Subject: GMC: Fan Shroud/ heater T's
>
>
>I got to looking at my fan shroud this evening. It stops just an inch or
>so
>ahead of the fan blades. I would expect it to extend so at least a
>portion
>of the blades are inside. Is this how it was designed or am I missing a
>critical piece? Can someone fill me on what the shroud is supposed to
>look
>like? Maybe this explains the vapor lock.
>
>Also my lines from the engine to the hot water have been cut. There were
>apparently T's in the heater hoses at some point but they're gone now.
>Can
>somebody explain to me where the original T's were placed?
>
>As it is one of the lines is 5/8 and the other is 3/4. The hose I'm
>adapting is all 5/8 so I need a source for the T's. I haven't been to
>hardware store to look but I think standard sizes are just 1/2 and 3/4 .
>I
>assume standard plastic pipe fittings will work ok if I get the sizes to
>match. Somebody flag me if this isn't correct. Anyway has somebody been
>here before that can save me some time?
>
>Also ordered AC hoses and fittings from ACME today. He told me that ACME
>had bought out ARA a few years back. Then when I mentioned I was
>updating a
>GMC he told me he was familiar with Cinnabar and Buskirk.
>
>Will appreciate any inputs someone can give me.
>
>Thanks
>
>Dick