Cooling The Automatic in an MC7

[Stormcloud]

I think I may have the solution.

The Hayden 2305 is suitable as a replacement cooler; it is a tad bit large at 24" x 31".

The engine bay doors on my bus are kinda banged up a bit ( previous owner ), so I think I will make one door to replace the 2 doors, skin with stainless, put some expanded stainless mesh in the centre area, and install one of these Hayden coolers in the new door.

If I need to add an electric fan or two later, I can.
I may extend the back bumper an inch or 2, just for a bit more buffer.
I have to relocate the license plate, but really no additional modifications.

The more I think about this, the better I'm liking it.  

Thanks to everyone that posted!

Mark

[lostagain]

I think you will need a lot of air to flow through your cooler. You can try without fans, but I bet you will need them, and good ones too. They could be remote controlled with a switch on the dash, or better yet with some kind of thermostat.

Another thing to consider is if you have the back of the engine compartment open, a lot of road grime and moisture will get in there and corrode things. That is what I found with the 102D of the hockey team's. I had to deal with corrosion in the wiring and small parts in the engine compartment, and the rad and intercooler from driving lots in the winter. I see the newer buses aren't open at the back anymore, they've gone back to side openings.

JC

[wg4t50]

MCI  7, all have cooling issues, after about mid 1972, they changed the configuration of the routing of the hoses from the thermostat housings, each went to a radiator, then had a small balance line between them, earlier models fed both thermostat housing into a junction box, then over to each radiator, well that was an issue due to the closest route to the bottom of engine moved the most water, so the radiator on the right side did little cooling vs the left side that did the major cooling.
Why I removed all the original radiators, fan, gear box etc and installed a large radiator across the rear using a pusher fan to cool, worked much better.
Cheers
Dave

[Stormcloud]

I can't see how there could be an accumulation of grime back there; the inside of the present bay doors are a bit dirty,  I have never cleaned them in the 5 years I have owned the coach, but theres nothing much more than dust there.

On our return trip from Az this winter, the 8V started leaking...a lot....how much I won't say, but my toad will never rust again. There was almost no fresh oil deposited on the inside of the doors. I think the air blowing down from the fans keeps pushing any grime down to the ground, rather than deposit it on the rear door, and I hope that continues if the door becomes ventilated.

I can install fans on a thermostat if necessary, along with a couple of guages to monitor it.

[Barn Owl]

I think he might be talking about the dirt and oil that gets sucked up from the low pressure created by the poor aerodynamic shape, and gets deposited on the outside. I am amazed how a couple of drops of oil managed to flip way up onto the back glass as I travel. If there was a cooler there then that stuff could get into it.

[buswarrior]

The rear of a coach style body is constantly pelted with a swirling vortex of sorts.

The air can be thought of curling up from under the coach and rolling back against the coach all the way to the roof sort of like those waves the surfers like to ride through.

Or, for those few busnuts that actually drive in the rain... have you seen a bobtail tractor driven in the rain? Notice the phenomenon of what the spray kicked up by the rear tires does in relation to the back of the sleeper cab?

So, all the dust, fluid drips, small gravel, rains onto the back of the coach.

You don't want to allow intake air to come from this area.

As long as your cooler is going to exhaust into that area, that's good, just so long as it actually does. Aerodynamics is a strange and mysterious force. It sucks and blows in ways that often doesn't make sense to us mere mortals!

And overpowers fans.

happy coaching!
buswarrior

[Stormcloud]

Yes, the plan is for the cooler to exhaust through the 'rear door' to the outside. The electric fans will force the air out of the engine bay through the cooler, and also help to keep the grime off the cooler.

I still think this is the best of the available options.

Mark