Allison 3060 over heating

Topic: Allison 3060 over heating (Read 1620 times) previous topic - next topic

Re: Allison 3060 over heating

Reply #25 – September 17, 2023, 08:51:48 pm

Quote from: Scubajeeper – September 17, 2023, 06:44:09 pm

I read that thread, the post about 200-230 being ok is disturbing, there's no way it can survive at those temps.

Actually with the newer Allison fluids, particularly the new Transynd 668 those temperatures are not a problem.

But, look at the fluid path from water pump to the transmission cooler. As already posted, some applications have a restrictor to direct more coolant flow to the transmission cooler.

Re: Allison 3060 over heating

Reply #26 – September 18, 2023, 05:48:45 am

Maybe others can chime in that have your setup,we just have the rocker switch,when you turn it off
no retarder,when on and you use the brake the light comes on in other words when the light is on
the retarder is on and in use.

Re: Allison 3060 over heating

Reply #27 – September 18, 2023, 09:47:25 am

On my 95 3060R, trans temp runs with engine temp. On mine thermostat temp is 181. According to conditions my engine will run 200 - 202 a lot of time in the summer months. If retarder is working during normal stop at red light from 60mph, trans temp will go to 220 for a short time. Using retarder on down grades will also send trans temps above 200 quickly.

Re: Allison 3060 over heating

Reply #28 – September 18, 2023, 12:17:54 pm

Just throwing this out there but could Scubas retarder be on all the time causing the overheat?

Re: Allison 3060 over heating

Reply #29 – September 18, 2023, 03:00:06 pm

I had to replace my transmission cooler on my 2001 a few years ago. I found that it was not cooling or even coming down fast enough after going up high. I found a bit of the weld had broken off inside after having it removed.

Re: Allison 3060 over heating

Reply #30 – September 18, 2023, 05:12:00 pm

The single wire that plugs into to the module on the accumulator, I've been told to unplug it and drive it to see if it heated up. What's your thoughts, if the retarder was dragging, I could see where it would build heat. Will this isolate the retarder or am I wasting diesel?

Re: Allison 3060 over heating

Reply #31 – September 24, 2023, 08:09:57 am

Is it possible that the disconnected retarder is operating constantly/ permanently in the lowest setting, which would be barely noticed yet would be loading the transmission?

Re: Allison 3060 over heating

Reply #32 – September 24, 2023, 06:16:51 pm

On my coach the ABS controls the clutch lock up and retarder. ABS failure could cause clutch to not lock up and overheat the transmission and cause the retarder to be inoperable.

Re: Allison 3060 over heating

Reply #33 – September 24, 2023, 08:21:22 pm

Quote from: Tom & Lynda – September 24, 2023, 06:16:51 pm

On my coach the ABS controls the clutch lock up and retarder. ABS failure could cause clutch to not lock up and overheat the transmission and cause the retarder to be inoperable.

I do have an ABS light on, I didn't make a connection. I guess that could have something to do with it. The only thing is, the ABS light was on when I bought it and we've made a long trip with no issues last year. I'll call Risch tomorrow and see what he says. Thanks for the post, you may be on to something.

Re: Allison 3060 over heating

Reply #34 – September 24, 2023, 08:27:39 pm

Do you feel the "mini-shift" at higher RPM in 2nd gear? That is when the torque converter should be locking up as you accelerate.

Re: Allison 3060 over heating

Reply #35 – September 25, 2023, 12:04:49 am

Quote from: wolfe10 – September 24, 2023, 08:27:39 pm

Do you feel the "mini-shift" at higher RPM in 2nd gear? That is when the torque converter should be locking up as you accelerate.

I don't, but the tech at United Engines in Shreveport drove the coach and said that he detected no problems with the function of the transmission. But he also didn't say anything about the ABS light being on either.

The only code the TCM showed was high sump temp. Wouldn't it throw a code if the converter wasn't locking up?

Re: Allison 3060 over heating

Reply #36 – September 25, 2023, 07:38:01 am

Quote from: Scubajeeper – September 25, 2023, 12:04:49 am

The only code the TCM showed was high sump temp. Wouldn't it throw a code if the converter wasn't locking up?

Sorry, don't know the answer to that one. You could certainly ask Allison (have your transmission model and serial number handy):

Allison help line 800 252 5283

Re: Allison 3060 over heating

Reply #37 – September 25, 2023, 01:05:37 pm

Open your ABS control box and unplug the power connector. Check to see if you have retarder function restored and check clutch lockup.

Re: Allison 3060 over heating

Reply #38 – September 25, 2023, 04:31:41 pm

Quote from: Tom & Lynda – September 25, 2023, 01:05:37 pm

Open your ABS control box and unplug the power connector. Check to see if you have retarder function restored and check clutch lockup.

Would you be so kind as to tell me where the ABS control box is?

Thanks

Re: Allison 3060 over heating

Reply #39 – September 25, 2023, 05:10:54 pm

On your '97 it should be hid in the basement behind the HWH compressor. Should be the 2nd bay on the drivers side of the coach behind the front tire. Some are on the wall and some were mounted on the celling of that basement bay. Look for a grey box that is about 8" square and 3" thick.

Mike

Re: Allison 3060 over heating

Reply #40 – September 25, 2023, 05:47:18 pm

It's in a really tight spot, I can't get behind it to try to disconnect power, I need both hands back there. Any suggestions?

Re: Allison 3060 over heating

Reply #41 – September 25, 2023, 10:02:57 pm

Wondering if this ABS issue could also be affecting my tranny heat issue.
By chance does anyone have the ABS box location for a 2001 U295?

Also, would leaving the Retarder turned on offset the ABS issue ?

Re: Allison 3060 over heating

Reply #42 – September 26, 2023, 09:28:57 pm

Completely disconnected the ABS box. Still having the overheating issue.
The tranny and retarder only got up to 199 today, but I believe that's because the ambient temperature was down.
Tranny is running about 12 to 15 degrees hotter than the radiator. Tranny ran 196 to 199 while motor was mid 180's.
Doesn't matter if the retarder is on or off. When stopped and idling, the tranny temp drops quickly to the motor temp.
Stumped on this one. Good news is the forecast is for relatively cool temperatures for the next couple of weeks and should keep the temps down.
I'll try to find a good Allison shop in Northern Colorado when I get back.

Re: Allison 3060 over heating

Reply #43 – October 14, 2023, 10:26:33 am

After taking the coach to a shop in NAC, it's still running hot. They basically did nothing but waste my time.

Everything points to insufficient cooling. I'm going to go with my original idea and add an air to fluid oil cooler in addition to the fluid to fluid cooler that's on there. I've figured out where to put it so I can use the return line from the original cooler to run to the new unit and have a short run back to the transmission. I plan on controlling the fan with a 180 degree on and 165 off switch. I'll post my results when I get it finished.

Re: Allison 3060 over heating

Reply #44 – October 14, 2023, 11:15:06 am

If fitting a second transmission fluid cooler, put it IN LINE BEFORE the OE cooler. You can over-cool ATF as well.

This routing will reduce heat load on the "cooling package" and insure that the ATF is not over-cooled.

But, since this is a very unusual issue, you are fixing a symptom, not the cause. Not necessarily bad, but......

Re: Allison 3060 over heating

Reply #45 – October 14, 2023, 02:15:53 pm

Are you 100% sure the tranny cooler from Ice box diesel was the same size cooler,agree with Brett,the trans is getting abnormally
hot for some reason.If the trans was not getting hot with the old cooler then the new cooler is the problem.

Re: Allison 3060 over heating

Reply #46 – October 14, 2023, 03:56:50 pm

Dimensionly they are identical, although they are not constructed the same.

Re: Allison 3060 over heating

Reply #47 – October 14, 2023, 04:33:57 pm

Quote from: Scubajeeper – October 14, 2023, 03:56:50 pm

Dimensionly they are identical, although they are not constructed the same.

Any engineering/BTU specs on either???

Re: Allison 3060 over heating

Reply #48 – October 14, 2023, 05:29:04 pm

When I had my cooler cleaned and tested the tech told me they don't make them like this
anymore.

Re: Allison 3060 over heating

Reply #49 – October 14, 2023, 08:53:07 pm

It has been long ago but it seems like Garry O had a similar problem and had to pull the control module out of the bottom of the trans and have it repaired. In my search I haven't been able to find the old thread that talks about his trouble yet.

Now with you living around Alex. LA. your go to place for trans work would be S & S in Longview, TX as they do a lot of Foretravel work. Longview | Stewart & Stevenson

I will keep hunting for the thread as it is here somewhere.

Mike

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