Repalcing Leaking Hoses, HT740 to Exchanger

chessie4905 · June 12, 2020, 04:08:52 AM

Do you have a transmission temperature gauge to monitor running temp?

buswarrior · June 12, 2020, 04:20:03 AM

For the future readers, so its in one place:

The needs are very different, between an auxiliary trans cooler, plumbed in-line to the stock oil to anti-freeze cooler, and a dedicated stand alone oil to air cooler.

Many with an aux report little need for the fans to run, when mounted in the curb side engine access door, as there's enough wind there.

With a dedicated, all the heat has to leave via that cooler, and fans are WAY more important to shed all the trans heat.

Scott has a dedicated.

Happy coaching!
Buswarrior

chessie4905 · June 12, 2020, 06:49:43 AM

Since his is mounted underneath, I can see the needs for the fans. Wonder what fans he used? Probably something from Summit for autos. Those are set up ready to go and some can move some serious air.

luvrbus · June 12, 2020, 03:27:01 PM

I ran a ISCAAN on a 4060 Allison yesterday the owner installed a 22x28 double pass Hayden cooler with fans it wasn't even close to the heat rejection need for the 4060 WT @ 80% torque converter capacity he going to water to oil

chessie4905 · June 12, 2020, 04:07:02 PM

Too small. Go with larger single pass

luvrbus · June 12, 2020, 04:18:12 PM

Quote from: chessie4905 on June 12, 2020, 04:07:02 PM
Too small. Go with larger single pass

Hayden sized it for him and the CFM on the fans ,Allison tells you that you can use a air to oil cooler they just will not commit to the size and flow needed,they do commit saying water to oil is more efficient in less space in the Allison application manual lol maybe because Allison does make a air to oil cooler

chessie4905 · June 12, 2020, 08:11:24 PM

Since Hayden makes the coolers up to 415,000 btu heat rejection, I guess their recommendation for that particular application was too conservative. Or he had limited installation space.

Scott & Heather · June 12, 2020, 08:23:09 PM

I did install a gauge and then promptly wired it wrong and blew it up. So I need to buy another one. My cooler, is 34" by 30" give or take. It's huge. I have a twin fam setup from Hayden as well. Twin 16" fans. They move a ton of air and sound like a Boeing 747 at idle.

luvrbus · June 12, 2020, 08:38:26 PM

The little 8x8 x4 16 plate double coolers on the Detroits do a good job cooling the engine oil and transmissions,the way they are design the water pump pulls the cooled water from the radiator then through the cooler first then into the engine monitor your engine oil temperature and you tell how good they work

Glennman · June 22, 2020, 11:53:14 PM

Well, I installed my new transmission coolant hoses today. Spendy buggers. $244.00 for 2, 1" hoses. One is 52", the other 32". I decided not to install a separate cooler just yet. I'll be putting the fluid in tomorrow. When filling the transmission, there is a "cold" mark on the dip stick, and a "hot" range. When you check the fluid, do you have it running, like to old cars? Is the cold mark for when it's not running, and it's cold? At any rate, I'll figure it out, but thought I'd get all your guys' input. It's late now and I'm getting tired, so I start asking dumb questions. Thank you, Glennman.

buswarrior · June 23, 2020, 04:28:19 PM

Like your car, running.

If it has been sitting, same as the car, cycle through reverse and drive to ensure everything is full of juice, the way it is supposed to be, before pulling the stick.

Cold and hot depending on...

Happy coaching!
Buswarrior

Glennman · June 23, 2020, 10:44:35 PM

Thanks Bus Warrior!

It says right on the dipstick that you check it while running. It was late; you know how it is.

Fired up the bus tonight, no leaks.

On to the next project.

Glennman

Glennman · July 08, 2020, 09:35:26 PM

Quote from: Scott & Heather on June 01, 2020, 03:48:03 AM
Glen I think Bus Warrior was talking about your alternator goin from air cooled to oil cooled which explains the aftermarket oil line.

As for cooling the trans: I just replaced my engine in my coach and whilst at it, I yanked that coolant/transmission fluid cooler and installed a huge Hayden cooler in the floor of the engine bay on the drivers side. Now my temps run a lot cooler. Definitely worth it for me.

Scott, When you say that you installed the Hayden cooler in "the floor of the engine bay", does that mean it faces the ground? I'm thinking I could install mine on the passenger side under the bus floor in the engine compartment, but it would not be taking air directly from the outside, as it would be in the environment of the engine compartment. However, there is a lot of open area that is exposed to the outside. Do you think that would get enough air? Or, should I install it in place of the side access door?