RV Trip Planning Discussions

Go Back   iRV2 Forums > POWER TRAIN GARAGE FORUMS > Allison Transmission Forum
Click Here to Login
Join iRV2 Today

Mission Statement: Supporting thoughtful exchange of knowledge, values and experience among RV enthusiasts.
Reply
 
Thread Tools Search this Thread Display Modes
 
Old 10-04-2019, 01:41 PM   #1
Senior Member
 
CountryB's Avatar
 
Monaco Owners Club
Join Date: Aug 2017
Location: Orlando, Florida
Posts: 4,644
How to test Transmission Cooler - transmission running hot, engine temps normal

On a 2003 Beaver Patriot Thunder with CAT C12 (505hp) with an Allison 4000 MH, the transmission oil temp is running much hotter than the engine coolant temperature. Usually the transmission and engine are within 10 degrees of each other (on other coaches).
On this coach, the engine temps run 190 all day but the transmission will hit 250 degrees under normal to heavy load in 6th gear. Dropping to 5th gear and getting engine rpm up will reduce the trans temps.

The transmission oil cooler is built into the radiator.

Is there any way to test the trans oil cooler (to determine if its clogged or if there is a flow issue)?

Any other ideas to what could be causing oil temps to run so high?
__________________

__________________
Mike ----- 2005 Beaver Patriot Thunder CAT C13 525HP, 42-ft Tag, with HydraLift -----
*SMC-Bvr-Mnco History/Brand Info https://1drv.ms/f/s!AtvAXw_lfqbToxXYREK9YdBP08Jn
*SMC-Bvr-Mnco Wiring/Air/Chassis manuals https://1drv.ms/f/s!AtvAXw_lfqbTm0WTuuNqpn9a8hCh
CountryB is offline   Reply With Quote
Join the #1 RV Forum Today - It's Totally Free!

iRV2.com RV Community - Are you about to start a new improvement on your RV or need some help with some maintenance? Do you need advice on what products to buy? Or maybe you can give others some advice? No matter where you fit in you'll find that iRV2 is a great community to join. Best of all it's totally FREE!

You are currently viewing our boards as a guest so you have limited access to our community. Please take the time to register and you will gain a lot of great new features including; the ability to participate in discussions, network with other RV owners, see fewer ads, upload photographs, create an RV blog, send private messages and so much, much more!

Old 10-04-2019, 05:03 PM   #2
Senior Member
 
Join Date: Jul 2017
Location: Michigan
Posts: 919
A trans shop can flush it. That's all I got.
__________________

steve52 is offline   Reply With Quote
Old 10-04-2019, 05:45 PM   #3
Senior Member
 
CountryB's Avatar
 
Monaco Owners Club
Join Date: Aug 2017
Location: Orlando, Florida
Posts: 4,644
Thanks for replying.
I figured a trans shop (or truck radiator shop) could do something - just wondering if there is anything that can be checked or done at home. I'm not even sure if that is the cause of the high temps.
__________________
Mike ----- 2005 Beaver Patriot Thunder CAT C13 525HP, 42-ft Tag, with HydraLift -----
*SMC-Bvr-Mnco History/Brand Info https://1drv.ms/f/s!AtvAXw_lfqbToxXYREK9YdBP08Jn
*SMC-Bvr-Mnco Wiring/Air/Chassis manuals https://1drv.ms/f/s!AtvAXw_lfqbTm0WTuuNqpn9a8hCh
CountryB is offline   Reply With Quote
Old 10-04-2019, 05:47 PM   #4
Senior Member
 
Chargerman's Avatar
 
Monaco Owners Club
Join Date: Nov 2015
Posts: 1,504
When was you fluid and filters last changed?
__________________
Steven & Laurie
2006 Moncaco Executive Rainier
Detrioit Series 60 (515HP), Allison 4000 series
Chargerman is offline   Reply With Quote
Old 10-04-2019, 05:53 PM   #5
Senior Member
 
bob caldwell's Avatar


 
Join Date: May 2017
Location: Vancouver Wash
Posts: 5,962
Add an external one....more capacity....
__________________
2010 Rockwood Sig Ultra lite 5er 8280......'99 Ram 2500, Cummins. 4x4.....Pullrite Superglide.......Use to work in calender factory.....got fired for tak'n a few days off.....RV Mutant 186.....Bob the Builder...
bob caldwell is offline   Reply With Quote
Old 10-05-2019, 06:33 AM   #6
Senior Member
 
CountryB's Avatar
 
Monaco Owners Club
Join Date: Aug 2017
Location: Orlando, Florida
Posts: 4,644
Thanks for the help and suggestions.

It not my coach so I cant tell you when the filters and oil was last changed.
It's a friends coach (very similar to mine but two years older). I know he takes good care of it.

We talked about adding a second cooler. That would not be an easy job considering the space and size of hoses, etc. But that is an option.

before that, I would like to rule out the factory trans cooler. It may be clogged (maybe it was undersized from the factory).

I also asked him to verify that the engine (hyd) fan is working properly. He knows it does not spin when the engine is cold but has not really noticed if it spins when the engine is hot. However the engine coolant temperatures are in the normal range (no overheating).
__________________
Mike ----- 2005 Beaver Patriot Thunder CAT C13 525HP, 42-ft Tag, with HydraLift -----
*SMC-Bvr-Mnco History/Brand Info https://1drv.ms/f/s!AtvAXw_lfqbToxXYREK9YdBP08Jn
*SMC-Bvr-Mnco Wiring/Air/Chassis manuals https://1drv.ms/f/s!AtvAXw_lfqbTm0WTuuNqpn9a8hCh
CountryB is offline   Reply With Quote
Old 10-05-2019, 08:08 AM   #7
Senior Member
 
Chargerman's Avatar
 
Monaco Owners Club
Join Date: Nov 2015
Posts: 1,504
I would try to verify last filter and fluid change. The factory cooler should be sufficient since it was previously. I would remove the cooler lines and flush the cooler out as see what comes out. Be sure not to flush through the trans or you can create a much bigger problem. I changed my fluid at 60k and it looked discolored and kind of burnt in color. I did not do a fluid sample but it is also a good idea. Thereís an Allison post on here and it might be good to post there as there was a a former Allison Engineer there and he is VERY knowledgeable
__________________
Steven & Laurie
2006 Moncaco Executive Rainier
Detrioit Series 60 (515HP), Allison 4000 series
Chargerman is offline   Reply With Quote
Old 10-05-2019, 01:22 PM   #8
Senior Member
 
CountryB's Avatar
 
Monaco Owners Club
Join Date: Aug 2017
Location: Orlando, Florida
Posts: 4,644
Quote:
Originally Posted by Chargerman View Post
The factory cooler should be sufficient since it was previously.
He said it has always run hot since he has owned the coach (about 4 years now I think). Sounds like it was this way when he bought it. Maybe it was this way from factory (defective cooler) or perhaps it clogged up years ago, or maybe something else going on.

This higher than normal transmission temperature has always bothered him. But he watches the temp and downshifts when it hit 250 degrees and gets temps down to under 220 before continuing.

He shouldn't have to do that.
My trans temps run about the same as my water temps. He has the C12 (40 footer with tag) mines a C13 (42 footer with tag).

Any idea what the proper/best way to flush is? I know tranny shops have a machines for flushing. Can this be done at home with simple tools?
__________________
Mike ----- 2005 Beaver Patriot Thunder CAT C13 525HP, 42-ft Tag, with HydraLift -----
*SMC-Bvr-Mnco History/Brand Info https://1drv.ms/f/s!AtvAXw_lfqbToxXYREK9YdBP08Jn
*SMC-Bvr-Mnco Wiring/Air/Chassis manuals https://1drv.ms/f/s!AtvAXw_lfqbTm0WTuuNqpn9a8hCh
CountryB is offline   Reply With Quote
Old 10-08-2019, 06:16 AM   #9
Senior Member
 
Join Date: Apr 2009
Posts: 518
A couple of suggestions:
1. Make sure the trans fluid and the engine coolant cross flow. If the trans cooler is a bottom tank, make sure the trans flow to the cooler is on the opposite side of the top radiator hose which should be hot coolant from the engine. If the trans cooler is a side tank, make sure the trans oil to the cooler goes in the bottom and out the top.


2. One simple way to get some flushing action is to back flush. Reverse the to and from cooler lines from the transmission. Leave the hose that is coming out of the cooler into a bucket and start the engine. As the engine is running, make sure the trans stays at a proper oil level. Look at what comes out of the cooler to see if it contains any debris.
dbarton291 is offline   Reply With Quote
Old 10-10-2019, 01:01 PM   #10
Senior Member
 
CountryB's Avatar
 
Monaco Owners Club
Join Date: Aug 2017
Location: Orlando, Florida
Posts: 4,644
Thanks. Great advise.
__________________

__________________
Mike ----- 2005 Beaver Patriot Thunder CAT C13 525HP, 42-ft Tag, with HydraLift -----
*SMC-Bvr-Mnco History/Brand Info https://1drv.ms/f/s!AtvAXw_lfqbToxXYREK9YdBP08Jn
*SMC-Bvr-Mnco Wiring/Air/Chassis manuals https://1drv.ms/f/s!AtvAXw_lfqbTm0WTuuNqpn9a8hCh
CountryB is offline   Reply With Quote
Reply

Tags
engine, test, transmission



Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Normal Coolant, Tranny temps...extra tranny cooler necessary? marjoa Ford Motorhome Chassis Forum 8 12-20-2017 02:47 PM
Normal engine running temps fsudelt Newmar Owner's Forum 15 06-07-2017 08:11 PM
Allison Transmission running colder than normal DEC0717 Alpine Coach Owner's Forum 6 01-15-2015 09:39 PM
Replacing Charge Air Cooler/Trans Cooler Assembly mharner Class A Motorhome Discussions 3 03-16-2012 07:20 AM
Engine temperature running hotter then normal. M&EM Workhorse and Chevrolet Chassis Motorhome Forum 29 05-06-2011 04:35 PM

» Featured Campgrounds

Reviews provided by


All times are GMT -6. The time now is 03:55 AM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2020, vBulletin Solutions, Inc.
×