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Re: Have Avco will Travel

Unread postby Acesneights on Thu Jun 13, 2013 5:31 pm

Did you try Summit racing for a universal shifter cable ? They might have something.
Check the body on the TQ for cracks. They have been known to split open and spill fuel.
The body is a phenolic plastic or something like that.
Did you check Onanparts.com ?
I have found stuff on Ebay too.
1975 Travco 270
1974 Travco 220 Parts unit
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Re: Have Avco will Travel

Unread postby Dr. Righteous on Thu Jun 13, 2013 8:37 pm

Acesneights wrote:Did you try Summit racing for a universal shifter cable ? They might have something.
Check the body on the TQ for cracks. They have been known to split open and spill fuel.
The body is a phenolic plastic or something like that.
Did you check Onanparts.com ?
I have found stuff on Ebay too.


"Universal" cables won't work for this application.
Need the specific correct cable for this and that is what I ordered.
Navistar had an exact replacement but they quit making them some time within the last couple years.
There are a few RV parts dealers that "horded" these cables and are asking $250 each. Better off having a custom cable made. All these cables will eventually fail. If your has not yet it is just a matter of time.
Thermoquad is already built and installed.
The plastic body was fine. What usually causes the cracks is torquing the screws down to tight. The spec is just a few inch-lbs. So that translates into just snugging the machine screws in. When the gasket swell on first use it will be ok. For some reason people want to crank the screws down as tight as possible, that will crack the screw bosses in the bowl assy.
It works fine and it runs nice. The only issue I had was the style of accelerator pump was the old type with a leather diaphragm. It was non-serviceable so I had to order the new type pump piston.
Thermostatic choke for the genny is installed and working fine. At first I installed the spring backwards so it started nice and after a bit started to choke itself out. :oops:

It rained off and on all day today so I could not get any mechanical work done.
My son and I worked on clearing more junk out of the interior and cleaning it up inside.
I bet I have unloaded at least 1000 lbs of junk from this thing and I have yet to go thought all the storage cabinets.
While we were cleaning found a '76 Dodge chassis manual. -woot!- According to the manual this sits on a M600 chassis, Rockwell rear with 4:88:1 gears.
Man do I need an overdrive!

I added water to the holding tank for the first time. No leaks but I found the fixtures are shot. At least those are fairly easy to replace.
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Re: Have Avco will Travel

Unread postby Acesneights on Fri Jun 14, 2013 9:58 am

I kept my TQ as well for a future rebuild . The plastic bodys work better for the fuel perculation but I will say mine runs really smooth with the Holley replacement.
Have you looked at gearvendors OD units ? Pricey but sometime can find a used on on CL or the bay.
Dodge made an OD tranny that was not computer controlled but I dont know if they made a big block version.
I think mine has 4:56 and it screams at 65.
I plan on an eventual cummins swap with with either the Dodge tranny that mates to it or possibly an Allison.
That is great that you found that manual. I wonder what the differences are to the M500.
Does the manual show the tag axle ?
1975 Travco 270
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Re: Have Avco will Travel

Unread postby Dr. Righteous on Fri Jun 14, 2013 2:50 pm

Acesneights wrote:I kept my TQ as well for a future rebuild . The plastic bodys work better for the fuel perculation but I will say mine runs really smooth with the Holley replacement.
Have you looked at gearvendors OD units ? Pricey but sometime can find a used on on CL or the bay.
Dodge made an OD tranny that was not computer controlled but I dont know if they made a big block version.
I think mine has 4:56 and it screams at 65.
I plan on an eventual cummins swap with with either the Dodge tranny that mates to it or possibly an Allison.
That is great that you found that manual. I wonder what the differences are to the M500.
Does the manual show the tag axle ?


The best version of the TQ was the one with an electric choke; that way you do not have to rely on the heat riser system to work correctly. That version is hard to find because it was an aftermarket version. I had one with a broken thermostat housing (plastic) and the part was N/A and nobody made a replacement since it wasn't a OEM carb. Problem with the heat riser is they all apart when they get old. This is why people say a Dodge is "cold natured" because of a non working heat riser. This one runs smooth with the TQ installed. You can tweak it some to make cold starting easier. The best fix is go to an electric fuel pump so you have instant fuel pressure before you turn the key.
Since this thing has 4.88:1 gears a overdrive will be a must. The kit for LoadFlight 3 speed with the parking brake on the tail shaft is $3400.
But think how quickly this will pay for itself if this can save you a couple MPG as well as a more comfortable and quiet operation.
The Dodge chassis manual does not cover the tag axles. I crawled under and looked that the air bags; they are shot. The bags are coming apart, so the system won't work without replacing them.
My shifter cable will be here on Tuesday so what is the last piece of the puzzle for now.
I think I have identified the fuel issue. Most of the length of the chassis there are hard fuel lines; when they split off and go to the fuel tanks, rubber lines are used. The lines going to the fuel tanks are dry rotted and leak just enough air you cannot prime the fuel pump unless the tanks have a large quantity of fuel in them. Then the pressure in the tank pushes the fuel through the lines. When the tank is low, there is almost none of this pressure, and it sucks air.
The only fix here is the drop the tanks. :(
I have to get under the chassis and make some measurements; I'm not 100% sure I will be able to get them out once I unbolt them.
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Re: Have Avco will Travel

Unread postby Acesneights on Sun Jun 16, 2013 7:34 pm

Wow that stinks, having to drop the tank. I had to replace my fuel lines as well but the Travco tanks have the bulk heads on the side so they are easily accessible without dropping the tank.
Believe me I am beginning to wish I had just repaired the TQ. The Holley is acting up when it sits hot for a bit. It's getting heat oak as well. I think at this point an Aluminum intake and blocking the riser ports is a must.
Check the bay and CL for GV units. IIRC the base unit is universal then you buy whatever adapters you need.
3400 is steep. Makes me wonder if just putting a factory OD tranny would be cheaper.
1975 Travco 270
1974 Travco 220 Parts unit
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Re: Have Avco will Travel

Unread postby Dr. Righteous on Sun Jun 16, 2013 8:34 pm

Acesneights wrote:Believe me I am beginning to wish I had just repaired the TQ. The Holley is acting up when it sits hot for a bit. It's getting heat oak as well. I think at this point an Aluminum intake and blocking the riser ports is a must.


Yeah, the old cast iron intake hold heat in and don't wick if off like aluminum. Switching to an aluminum manifold pretty much guarantees you will have heat soak issues. The better heat insulator adapters are made by Edelbrock. They have composite wood adapters that isolate better than the plastic ones.
That is what I use on my Dodge Ramcharger which I run a Eddy 1406 on a aluminum MoPar M1 intake.
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Re: Have Avco will Travel

Unread postby Dr. Righteous on Wed Jul 10, 2013 12:58 pm

Not posted in a little while.
Replace the shifter cable, all that is works good now. Rebuilt TQ carb, engine runs nice now.
Had to drop the fuel tank and rebuild it.
It has a massive buildup of varnish inside. Had to cut the top of the tank off to clean it all out and coat the inside with a tank sealer.
Welded it back together and will install a new fuel level sender and pickup assy soon. Expect to
have it install back in the MH this weekend.
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Re: Have Avco will Travel

Unread postby 77Travco on Thu Jul 11, 2013 10:26 am

I would be curious to know the part number for the fuel sender unit that you used. I have a 70 gallon tank in my M500 chassis that needs a new one.
Last edited by 77Travco on Fri Jul 12, 2013 10:42 am, edited 1 time in total.
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Re: Have Avco will Travel

Unread postby Dr. Righteous on Thu Jul 11, 2013 10:40 am

77Travco wrote:I would be curious to know the part number for the fuel sender unit that you used. I have a 70 gallon tank in my M500 chassis that need a new one.


Yeah, this is a real find and it is inexpensive also.

It is made by Auto meter and is a universal sender that is adjustable to different tank sizes.
$31 from Jegs.

http://www.jegs.com/i/Auto+Meter/105/3262/10002/-1

This one even matched the mounting bolt pattern of the original one so it will go right in.
The only work around will be determining if your gauge needs a high resistance for full or low resistance for full.
You have to reverse the wires on the sender to make it work.
You would think that low resistance= full tank, but that isn't necessarily the case. You have to test first.
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Re: Have Avco will Travel

Unread postby 77Travco on Fri Jul 12, 2013 10:47 am

Please be sure to post how well it works once installed. Mine is low resistance = full... or at least when I ground the wire, the gauge goes to full.
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