Fast Onan Question

michael1

New member
Nov 14, 2010
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Did the Original Onan genset liek the one from my year GMC (73) "pull-out" on a pull out tray? Mine does, I can pull my Onan out with its slide tray to service it. I was just wondering if all GMC generators do that?
--
***"Gettin There"-1973 23' Sequoia-
Michael, Casa Grande, AZ
 
> Did the Original Onan genset liek the one from my year GMC (73) "pull-out" on a pull out tray? Mine does, I can pull my Onan out with its slide tray to service it. I was just wondering if all GMC generators do that?


All the GMCMH Onans are pullout. Known as "Power Drawer". Not sure about the Kohler units.
--
Steve Southworth
1974 Glacier TZE064V100150 (for workin on)
1975 Transmode TZE365V100394 (parts & spares)
Palmyra WI
 
Great, what year started to have the battery also slide out since mine is under the seat in the rear.
Also I said it was a fast question, but another quick one, when using the generator does anyone pull it out. Just figured it would allow heat to escape easier and keep the exhaust out away from the coach a little more.
--
***"Gettin There"-1973 23' Sequoia-
Michael, Casa Grande, AZ
 
On a hot day I have seen lot of people pull them out for better cooling.
We have the hot air deflectors of 2 different designs to deflect the
hot cooling air away from the set and also avoid steering up dust
under it which the generator will draw up for the carburetor..
 
You bet! It made the Troll easily viewable while cursing at it.

Larry Davick

>
>
> Did the Original Onan genset liek the one from my year GMC (73) "pull-out" on a pull out tray? Mine does, I can pull my Onan out with its slide tray to service it. I was just wondering if all GMC generators do that?
> --
> ***"Gettin There"-1973 23' Sequoia-
> Michael, Casa Grande, AZ
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> Great, what year started to have the battery also slide out since mine is under the seat in the rear.
> Also I said it was a fast question, but another quick one, when using the generator does anyone pull it out. Just figured it would allow heat to escape easier and keep the exhaust out away from the coach a little more.

Mike,

There is no room in the rear of a 23 for the house bank.

The battery-Onan arrangement is quite different in a 73-23 and almost anything else. Only 73-4 had the APU start battery in the rear and a house bank in the front. GM quit upfitting 23s for 75my, that is also when the house bank went to the rear and is also the APU start. The battery drawer is a completely after market piece and only fits in a 26. (Yes, I am a little jealous.) The space is there regardless of build year and most 26 have been refit to have the house bank in the rear.

There is volume in the APU locker aft of the Onan that is inaccessible. Other than the squirrel that used the space to store his stash of walnuts, I have not known any use to be made of it.

Matt
--
Matt & Mary Colie
'73 Glacier 23 Chaumière (say show-me-air) Just about as stock as you will find
SE Michigan - Twixt A2 and Detroit
 
> Did the Original Onan genset liek the one from my year GMC (73) "pull-out" on a pull out tray? Mine does, I can pull my Onan out with its slide tray to service it. I was just wondering if all GMC generators do that?


Michael,

Here is a poor photo showing the battery on my 73, 23 ft. Sits in a hole accessible from inside the coach -- under a gaucho cushion. I power the macerator from this battery as well.

http://www.gmcmhphotos.com/photos/showphoto.php?photo=38037&title=pertronis3-002&cat=4620

Dennis
--
Dennis S
73 Painted Desert 230
Germantown, TN
 
> Great, what year started to have the battery also slide out since mine is under the seat in the rear.
> Also I said it was a fast question, but another quick one, when using the generator does anyone pull it out. Just figured it would allow heat to escape easier and keep the exhaust out away from the coach a little more.


The slide out batteries were never a GM supplied arrangement. Many people have added battery slide-outs later.
--
Bob de Kruyff
78 Eleganza
Chandler, AZ
 
Matt,

Does your electrical cable not store behind the APU compartment? Most
Birchavens I've seen have a cable door in the side of the rear cap into
which the cable is pushed to curl up into that blind space.

Ken H.

> ...
> There is volume in the APU locker aft of the Onan that is inaccessible.
> Other than the squirrel that used the space to store his stash of walnuts,
> I have not known any use to be made of it.
>
>
 
IIRC: The GM upfitted 23 foot coaches had the same "electrical cable" compartment over the street side rear wheels as the 26 foot coaches.

I agree that having the cord utilize the space behind the Onan would be much better. BUT, I would not do it like Coachman did it... I find the little doors they used rather ugly. My plan (for any of the coaches) is to move the access to behind the license plate. I found some flip down plate holders at the junkyard. It is on the list... almost as far down my list as a paint job.

My thought on the compartment that GM put the cord in? It looks like a good location for an outside shower.


> Does your electrical cable not store behind the APU compartment? Most
> Birchavens I've seen have a cable door in the side of the rear cap into
> which the cable is pushed to curl up into that blind space.
>

> > ...
> > There is volume in the APU locker aft of the Onan that is inaccessible.
> > Other than the squirrel that used the space to store his stash of walnuts,
> > I have not known any use to be made of it.

--
Mike Miller -- Hillsboro, OR -- on the Black list
(#1)'73 26' exPainted D. -- (#2)`78 23' Birchaven Rear Bath -- (#3)`77 23' Birchaven Side Bath
http://m000035.blogspot.com
 
Mike,

I agree with you that the Coachmen wiring plug cover is chintzy --
especially now that I've replaced the always-breaking bakelite plug
with a more substantial one -- which won't let the door close. :-(

When I installed the flip-down license plate I was more concerned
about getting rear control of the air suspension than hiding the
utilities, so I filled that area with switches. No turning back now,
that I can see.

An interesting side note: When I gutted the GMC I found that there
was structure at the rear, above the Onan, for a standard GMC utility
door casing. So I got a door from Zeb Frady and made a jig to guide a
router around the outer contour. When I cut the plug out, lo &
behold, there was a welded-on striker lug for the latch! Behind that
door is now a fairly good sized fiberglassed storage compartment,
beneath the floor of the bathroom closet. Water hoses, extension
cables, adapters, etc., all reside there.

Some years ago I bought a purpose-designed external shower compartment
with door. I've never installed it because I can't figure out how to
duplicate the setup I had on the 40' SOB: I had a U-shaped 3/4"
aluminum tube "curtain rod" which swung up against the side of the
coach, surprisingly innocuously. A plastic curtain around that gave
me a private outdoor shower for use in relatively private parking
locations. I seldom used the inside shower upon return from the gym
and beach, even though it was home-sized.

Ken H.

>
>
> IIRC: The GM upfitted 23 foot coaches had the same "electrical cable" compartment over the street side rear wheels as the 26 foot coaches.
>
> I agree that having the cord utilize the space behind the Onan would be much better.  BUT, I would not do it like Coachman did it... I find the little doors they used rather ugly.  My plan (for any of the coaches) is to move the access to behind the license plate.  I found some flip down plate holders at the junkyard.  It is on the list... almost as far down my list as a paint job.
 
> Matt,
>
> Does your electrical cable not store behind the APU compartment? Most Birchavens I've seen have a cable door in the side of the rear cap into which the cable is pushed to curl up into that blind space.
>
> Ken H.

Ken,

Mike is correct. There is an access door about centered over the aft rear wheel. There is a space to coil the shore power cable and the city water fitting. This works out to being the back side of the electrical locker.

I have never seen any door in the left corner of the rear cap.
Now, if there was a neat way to open up that space, I could move the cable back there and free up the space it is in now.

Matt
--
Matt & Mary Colie
'73 Glacier 23 Chaumière (say show-me-air) Just about as stock as you will find
SE Michigan - Twixt A2 and Detroit
 
>> Great, what year started to have the battery also slide out since mine is under the seat in the rear.
>> Also I said it was a fast question, but another quick one, when using the generator does anyone pull it out. Just figured it would allow heat to escape easier and keep the exhaust out away from the coach a little more.

I recall reading in one of the Onan drawer model manuals that one should not run it continously when pulled out.
The air cooling system is designed to pull air around the outside of the Onan and blow it out through the bottom area.
It doesn't do this when pulled out.

Also, the weight is supported on the two slides and when pulled out and run, the vibration can loosen bolts holding the supports.

Emery Stora
77 Kingsley
Santa Fe, NM
 
> ...
> An interesting side note: When I gutted the GMC I found that there
> was structure at the rear, above the Onan, for a standard GMC utility
> door casing. So I got a door from Zeb Frady and made a jig to guide a
> router around the outer contour. When I cut the plug out, lo &
> behold, there was a welded-on striker lug for the latch! Behind that
> door is now a fairly good sized fiberglassed storage compartment,
> beneath the floor of the bathroom closet. Water hoses, extension
> cables, adapters, etc., all reside there. ...


The only coach I have ever "seen" with a door where you seem to be saying was the 23 foot Avion:
https://picasaweb.google.com/116133311780080773161/Avion23

As this is the only 23 foot Avion I have even seen pictures of, I do not know if it is "standard" or not.... I expect "standard" as the circuit breaker panel is just inside... behind the street side dinette seat back.

I also use the space above the Onan for storage, just access it from inside the coach. (The closet floor lifts out in sections.)
--
Mike Miller -- Hillsboro, OR -- on the Black list
(#1)'73 26' exPainted D. -- (#2)`78 23' Birchaven Rear Bath -- (#3)`77 23' Birchaven Side Bath
http://m000035.blogspot.com
 
Mike,

This appears to be the same galvanized box that Avion used on their 26" models. In the 26' it comes in under the bathroom sink:

http://www.gmcmhphotos.com/photos/showphoto.php?photo=36567

Click on View All and you will find picture 36 of 82 which is a view from the inside behind the drivers side dinette seat.

You can see the water line at the rear going down to the blue water pressure regulator and the armored cable going from the plug
that's mounted on the front of the box down to the Onan.

Regards,
Rob M.

-----Original Message-----
From: Mike Miller

The only coach I have ever "seen" with a door where you seem to be saying was the 23 foot Avion:
https://picasaweb.google.com/116133311780080773161/Avion23

As this is the only 23 foot Avion I have even seen pictures of, I do not know if it is "standard" or not.... I expect "standard" as
the circuit breaker panel is just inside... behind the street side dinette seat back.

I also use the space above the Onan for storage, just access it from inside the coach. (The closet floor lifts out in sections.)
--
Mike
 
If you blow this photo up and look very carefully directly above the
generator door just above the beltline, you can see the door. I've
seen one other coach with it.

http://www.gmcmhphotos.com/photos/showphoto.php?photo=440&cat=3055

Sorry I can't offer a blow up of that area, but I seem to have lost my
copy of the photos in that album. Thank goodness for bdub & his
GMCMHPhotos!

Ken H.

> The only coach I have ever "seen" with a door where you seem to be saying was the 23 foot Avion:
> https://picasaweb.google.com/116133311780080773161/Avion23
>
 
Vibration is a major concern for sure. Didn't know about the cooling however very interesting.
--
***"Gettin There"-1973 23' Sequoia-
Michael, Casa Grande, AZ
 
My 23' Norris upfit is done that way.  The door is about 8x20, and the compartment is such that it's easy to just push the cable into a roll on the walls of the (shallow) compartment.  There's no genset plughole in there, Norris used a switch inside under teh vanity to select genset or shore power.  The switch back is in the genst bay where the shore power cable also runs, not in the cabionet with the rest of the electrics.
 
--johnny
 
'76 23' transmode Norris
'76 paslm beach

________________________________
From: Ken Henderson
To: gmclist
Sent: Tuesday, December 20, 2011 8:36 PM
Subject: Re: [GMCnet] Fast Onan Question

If you blow this photo up and look very carefully directly above the
generator door just above the beltline, you can see the door.  I've
seen one other coach with it.

http://www.gmcmhphotos.com/photos/showphoto.php?photo=440&cat=3055

Sorry I can't offer a blow up of that area, but I seem to have lost my
copy of the photos in that album.  Thank goodness for bdub & his
GMCMHPhotos!

Ken H.

> The only coach I have ever "seen" with a door where you seem to be saying was the 23 foot Avion:
> https://picasaweb.google.com/116133311780080773161/Avion23
>
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