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Failed Transmission cooler
Well here I go again. Was traveling west on I40 jus oveer the Oklahoma line when I noticed the Allison was in 5th gear and would not shift to sixth. Stopped at the East bound visitor centre to check the tranny fluid WITHOUT shutting the engine...

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Re: Failed Transmission coole
Reply #1
Sorry to hear about this breakdown, Roland.  At least you are not out in the boonies...

Re: Failed Transmission coole
Reply #2
Ouch. 

Re: Failed Transmission cooler
Reply #3
That is a bummer! Man, I hope you get this solved and can put it in the rear view mirror soon. To fail that soon... there has to be a reason. Maybe the mounting points are stressing the assembly (not enough give in the mounts?). I feel your pain!
Don

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Re: Failed Transmission cooler
Reply #4
That is a bummer! Man, I hope you get this solved and can put it in the rear view mirror soon. To fail that soon... there has to be a reason. Maybe the mounting points are stressing the...


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Re: Failed Transmission cooler
Reply #5
GOOD NEWS!   ^.^d

Re: Failed Transmission cooler
Reply #6
Appears the new transmission cooler that was put in four years ago has failed. If that is the case I've had it, just can't throw more $$$$ at this thing. I'm at another 10CB in repairs this year already and the money tree has shed it's last leaf.

...

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Re: Failed Transmission cooler
Reply #7
Sorry to read of more troubles.

Any sign of transmission fluid in the plastic radiator overflow tank?

Any codes stored in the trans ECU?

Where are you parked?

Re: Failed Transmission cooler
Reply #8
Roland- very sorry to hear about your issue.  The good news is that you have your place in Ajo now, so you and Carmen have a home.  We were hoping to see you both at Quartzite in January, but it seems this might not happen.  Maybe we can swing by...

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Re: Failed Transmission cooler
Reply #9
Yes, need more info to give reasonable advice:

Any sign of oil in the coolant reservoir (milky/cloudy)?

Any sign of coolant in the transmission fluid or is it still clear pink?

No first hand experience with the Allison 4 speed, but never heard of...

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Re: Failed Transmission cooler
Reply #10
We are in Lakewood NM at an SKP coop park. Level in the plastic overflow tank is higher than it was before this happened. I was low on coolant but not anymore. I was hoping to see transmission coolant on the ground but nada.

HOW IT HAPPENED

...

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Re: Failed Transmission cooler
Reply #11
Roland,

Listen carefully to Brett. Yes, you may have an issue but perhaps not as bad as it seems. While I would not spend another $12K, I would look at possibilities before writing the coach off. If the cooler has failed, possibilities would be to...

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Re: Failed Transmission cooler
Reply #12
Roland,

I was thinking about something like this with an electric fan. 25-Row Dual Pass Fluid Cooler

or: 1030606-DS-12 - BD Xtrude Transmission Cooler with Fan - Double Stacked...

Mounting a trans cooler on the radiator face might be a good idea and...

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  • Andy 2
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Re: Failed Transmission cooler
Reply #13
Roland sorry to hear about the problems, I had a silver bus with a 892 Allison 4 speed, and had a stand alone trans cooler with a fan and it worked great, just some food for thought. Good luck my friend.

  • rbark
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Re: Failed Transmission cooler
Reply #14
Roland, sorry to hear of your problems. I hope there will be an easy and not too expensive solution. Good luck!

  • nitehawk
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Re: Failed Transmission cooler
Reply #15
Roland, here is a picture of what is in our coach. I believe it is available from O'reilly's
The mount for the tranny cooling radiator is welded to the frame.

Re: Failed Transmission cooler
Reply #16
Roland take the advice change the Trans oil and separate the cooler. You could bypass the cooler with the correct fluid level and take it for a short drive to verify the Trans is not damaged further then get an air cooler. Company near me makes...

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Re: Failed Transmission cooler
Reply #17
Wow!  Sorry to hear Roland. 

Pierce seems to have a good plan for you even if you don't jump right on it........not much deterioration of your FT in that New Mexico climate.

Good luck.
  • Last Edit: October 12, 2018, 08:07:03 am by Travelin' Man

  • bbeane
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Re: Failed Transmission cooler
Reply #18
Sorry to here of your problems my friend, hope you can work through them and keep on going. But I do completely understand all the leaves gone on that side of the money tree. JMHO I would have to be looking in used bin for a transmission and cooler.

Re: Failed Transmission cooler
Reply #19
When I read your HOW IT HAPPENED, what comes to mind is that the tranny ATF fluid is too low, which I think you know. Why not add more for now to see if the correct level settles out again.

Does the radiator coolant look like it is mixed with oil,...

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Re: Failed Transmission cooler
Reply #20
While the earlier Allisons w/o lockup will produce a lot more heat, the later coaches with lockup should not need a large ATF to air transmission cooler. Something to think about in the older coaches as this failure could be a game changer.

If the...

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Re: Failed Transmission cooler
Reply #21
OK I admit it. I panicked. Getting close to my move to Ajo and concluded the worst without any diagnostics. Not the transmission cooler. Finally got a chance to get under the coach this afternoon and I found the problem, I also found a bonus...

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  • Twig
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Re: Failed Transmission cooler
Reply #22
Dang. I wanted those tires. You coming through Deming, btw?

Re: Failed Transmission cooler
Reply #23
Any good truck repair shop can do the wheel seal, not motorhome specific.

Re: Failed Transmission cooler
Reply #24
BUT (yes, big BUT) the oil may have leaked onto the brake pads.  If so you need to do a rear axle brake job.