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Old 07-01-2019, 02:11 PM   #1
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Transmission Cooler

I hope this makes it run much cooler. I will replace the thermostat at the same time. It should not get as hot as it does going up long grades.

2003 TC2000 FE 5.9 ISB with Allison AT545.

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Old 07-01-2019, 02:31 PM   #2
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Good luck with the mod! 545s need all the help they can find...
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Old 07-01-2019, 04:23 PM   #3
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That looks kind of small, but pics don't always represent truth.
What are the dimensions, if you know?
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Old 07-01-2019, 04:42 PM   #4
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Did this to my 28 foot t/c 2000 1991 5.9 at 545 here is the link do not know how well it works yet as i just got it running . http://www.skoolie.net/forums/f39/tr...a-21810-2.html
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Old 07-01-2019, 04:46 PM   #5
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I've got a REALLY sweet Earl's cooler from Tango to put on my bus with a 545.
Mine didn't come with a fan but I'm adding one.

The one pictured looks to be of a similar size but hard to tell.

Should be a great mod though!
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Old 07-01-2019, 07:19 PM   #6
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Just make sure the inlet and outlet are big enough for your transmission's hoses. Most coolers intended for cars have connections much too small to be useful for a bus transmission. When I added a cooler to my HT740 to reduce its heatload into the engine coolant, I had to use a big Thermal Dynamics one because it was the only one with 1" ports.

John
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Old 07-01-2019, 07:45 PM   #7
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Quote:
Originally Posted by Iceni John View Post
Just make sure the inlet and outlet are big enough for your transmission's hoses. Most coolers intended for cars have connections much too small to be useful for a bus transmission. When I added a cooler to my HT740 to reduce its heatload into the engine coolant, I had to use a big Thermal Dynamics one because it was the only one with 1" ports.

John
This is a Cummins 5.9 with a at 545 so the fittings are -8
(dash
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Old 07-01-2019, 11:46 PM   #8
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Quote:
Originally Posted by Iceni John View Post
When I added a cooler to my HT740 to reduce its heatload into the engine coolant, I had to use a big Thermal Dynamics one because it was the only one with 1" ports.

John
That is a great idea to keep the transmission heat out of the engine coolant and keep the transmission cooler. I did that with my 01 7.3 power stroke. Removed the stock tiny oil to water cooler and bolted in a oil to air cooler from a 6.0. It made a huge difference in transmission temps.

Ted
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Old 07-03-2019, 12:12 PM   #9
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Thanks for the feedback.

It has -8AN fittings so i think the size is good.

It measures 15"x11" with a 10" fan, 650 CFM.

Stay tuned for the results.
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Old 07-03-2019, 12:19 PM   #10
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Quote:
Originally Posted by Rivetboy View Post
Did this to my 28 foot t/c 2000 1991 5.9 at 545 here is the link do not know how well it works yet as i just got it running . http://www.skoolie.net/forums/f39/tr...a-21810-2.html
Yes i read this thread while researching. Curious about the results for you.
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Old 07-03-2019, 12:25 PM   #11
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Also about the thermostat. My bus has a 2002 ISB in a 2003 bus. Apparently leftover previous 02's were used in 03 buses.

My engine serial number indicates an 02 engine requiring a thermostat #5292742....180 degress....
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Old 07-03-2019, 02:16 PM   #12
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Quote:
Originally Posted by Disbus View Post
Also about the thermostat. My bus has a 2002 ISB in a 2003 bus. Apparently leftover previous 02's were used in 03 buses.

My engine serial number indicates an 02 engine requiring a thermostat #5292742....180 degrees....
Was there a difference between the 02 and 03 engines? The EPA crap didn't start till 04.Engines don't normally have a build date like the Chassis or body.
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Old 07-03-2019, 02:35 PM   #13
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Was there a difference between the 02 and 03 engines? The EPA crap didn't start till 04.Engines don't normally have a build date like the Chassis or body.
Taken from Cummins Forum entirely. Spelling and all.

1: well a quik insight is the first gen is a 12 valve cummins with a mechanical injection pump very simple and very reliable and can make gobs of hoarsepower

2: second generation is a 24 valve cummins with a electronic vp44 injection pump not the most reliable but not so bad if you treat it right and monitor certain perameters...also this is where plug and play come into fact can also get loads of hp out of this motor...if purchasing one of these definitly look into a good lift pump and fuel pressure gauge the day you bring it home

02 to 03 here

3:3rd generation is the same 24 valve cummins with a common rail injection it has a cp3 injection pump with the same weak link lift pump...will need to upgrade fuel system on this also...they do have some injector problems that can get pretty expensive and this mostly a result in human error but not always if purchasing one of these you shoud have the injectors flow tested to ensure there are no problems...also there is a guy here name maxtorq that is very knowledgable and can help you out with injector issues if you have them
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Old 07-08-2019, 07:54 PM   #14
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Trans cooler and thermostat coming this week.
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Old 07-08-2019, 08:11 PM   #15
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There are actually a lot of differences over the years in cummins engines. Yeah, the core engine and some components remained somewhat the same, but if you're looking at swapping, you're better off getting the same year engine.

For instance, most don't know that they changed the way the cam/crank timing is picked up in 2000.

Let alone changing from a vp44 to common rail in 2003, then adding egr and changing the cams in 2004, and going to a 6.7 liters in 2007. Plus the addition of different families of exhaust filters and catalysts has occurred since then. There were quite a few changes that most don't know about.
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Old 07-12-2019, 11:22 AM   #16
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The cooler is going in today. It's over 100 degrees all this week so a good test after.
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Old 07-13-2019, 12:48 PM   #17
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Installed the cooler and a new thermostat. The old thermostat looked fine. It was 180 degrees. Replaced with the same.

Better cooling characteristics all around. Cooler running temps, quicker cooling off when it get warm. I'll post some pics later.
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Old 07-13-2019, 11:16 PM   #18
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Positioned in front of the air filter housing



Lots of fresh air.

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Old 07-14-2019, 09:03 AM   #19
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Do you have a trans temp gauge? If so what readings were you getting. Very nice looking install.
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Old 07-14-2019, 11:43 AM   #20
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I don't have a temp gauge for the transmission. I'm considering it. VDO has a matching one to the rest of my gauges. Not too expensive.

Thanks! I'm happy with the way it turned out. I'll get some pics of hoses and routing asap.

The kit I bought came with every single piece I needed. Super happy with the connections and hardware. All 8an fittings connected to my existing hoses and oil cooler. Lost hardly any fluid. Derale 15900. ~170 on Amazon.
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