Charlie D.
E. Texas-Orange
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RCMAN46 wrote:Until we get some temperatures from the OP we do not know what is overheating. An overfilled Allison will overheat without the engine temperature beyond the limits. We need more information from the OP. From what I read I was of the impression his transmission was overheating but then what some consider too high is often well within normal operating temperatures.
X2-
What temperature is it running and how do you know it is running hot?
My 2006 runs about 80 deg. above ambient.
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RCMAN46
NorthWest
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I am not trying to bash Killerbee. I have an 05 LLY and I did replace my mouthpiece after reading the Killerbee information. I did not have a overheat problem with engine cooling or transmission. I was running into the 1300 plus with EGT's. The mouthpiece helped with that.
We need to know what is the problem the OP has. If his engine temperatures are in the normal range below 220 then there is not much that can be done to the engine cooling system to help the transmission. The engine thermostats will keep the engine near 210. But if the transmission is overheating then the OP needs to look elsewhere. Transmission fluid level is one and another that will help is Tow Haul and keeping rpm's up to lower the torque demand on the transmission.
Some temperatures from the OP would probably help us to help him.
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Kip81
utah
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If its just your tranny its probably overfilled as said before its best to run the allison a little low. The overheating problems on the LLY have been blown we out of control. The fan kicking on when pulling up hills isn't overheating.
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mapguy
Puget Sound
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Very important not to overfill the Allison! Proper oil checking procedure is also needed. Check your Owners Manual -in the Duramax Supplement....for procedure. Your goal is repeatable dipstick readings to verify level.
160* Temp on Tranny Gauge = oil level near the bottom of "Hot" hash (XX) markings of dipstick
180* Temp on gauge = oil level in the middle of the "Hot" range.
200* Temp on gauge = oil level at top of "Hot" range.
Yes, the fluid can expand that much. Over filled causes transmission to fight itself internally due to the over abundance of fluid -simplified explanation.
With TranSynd of other TES-295 certified oil -low 200's temps are no problem. If not using the high end fluids -strongly suggest using TES-389 certified fluids to avoid DexronVI related seal failure long term.
Additional benefit to TES-295 fluids is the long service life....
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mapguy
Puget Sound
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BTW -if your overheat issue is cooling system based check out this thread over at the Dieselplace.com. You will have to register to view this thread.
DIY secondary cooling system LLY
There are several issues that can contribute to an LLY Duramax overheating. The above is a proven auxilary radiator solution. It does not deal with the problem related to thermal dynamics of the intake system or an overfull transmission.
EDIT: Forgot about the DIY tranny cooler for LLY (not 2006 LLY)and earlier:
DIY Duramax Trans Cooler
* This post was
edited 04/16/12 02:24pm by mapguy *
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ib516
Up here!
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Kip81 wrote:If its just your tranny its probably overfilled as said before its best to run the allison a little low. The overheating problems on the LLY have been blown we out of control. The fan kicking on when pulling up hills isn't overheating.
You're right. The fan coming on is not overheating.
THIS IS OVERHEATING
HERE'S A GOOD BUNCH OF DISCUSSION ON THE OVERHEATING TOPIC
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mapguy
Puget Sound
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ib516 wrote:Kip81 wrote:If its just your tranny its probably overfilled as said before its best to run the allison a little low. The overheating problems on the LLY have been blown we out of control. The fan kicking on when pulling up hills isn't overheating.
You're right. The fan coming on is not overheating.
THIS IS OVERHEATING
HERE'S A GOOD BUNCH OF DISCUSSION ON THE OVERHEATING TOPIC
Correct. Fan engagement is proper when you see 220* or so. Hayden has a severe duty clutch that is a little quicker to engage. This is one of the side benefits of the auxilary cooling mod linked earlier. It eliminates the fan engagement except at extreme usage.
Part of the problem is the grossly inaccurate water temp gauge. Really need something that is accurate like a scangauge. Search on engine temp gauge for these era GM diesels will give you more reading than you want....
These trucks don't like being lugged at all, temp wise -coolant & egt.
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Kip81
utah
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mapguy wrote:ib516 wrote:Kip81 wrote:If its just your tranny its probably overfilled as said before its best to run the allison a little low. The overheating problems on the LLY have been blown we out of control. The fan kicking on when pulling up hills isn't overheating.
You're right. The fan coming on is not overheating.
THIS IS OVERHEATING
HERE'S A GOOD BUNCH OF DISCUSSION ON THE OVERHEATING TOPIC
Correct. Fan engagement is proper when you see 220* or so. Hayden has a severe duty clutch that is a little quicker to engage. This is one of the side benefits of the auxilary cooling mod linked earlier. It eliminates the fan engagement except at extreme usage.
Part of the problem is the grossly inaccurate water temp gauge. Really need something that is accurate like a scangauge. Search on engine temp gauge for these era GM diesels will give you more reading than you want....
These trucks don't like being lugged at all, temp wise -coolant & egt.
I have a CS to monitor everything put that doesn't matter all it does is monitor it, it won't stop you from overheating.
If overheating was such a big problem don't you think there would be a company making the cooling kits and make millions?
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Fastfwd101
Mt Home Idaho Via TEXAS (Air Force)
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Have not had time to check the fluid level yet. Just had the 50,000 tranny service done. She did it before and after. ot Doed not get hot all the time, just towing up grades and then it will hit the 3/4 mark or higher.
I like the sound of the ingleewood cooler..Has anyone here used one?
Also like the cold air intake box, wonder if its worth the price.
05 2500HD Duramax/Allison
3:73/4X4/CC
08 31Ft Keystone Energy TH
89 17.5 Stratos FS
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mapguy
Puget Sound
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Kip81 wrote:++++ snip ++++++....I have a CS to monitor everything put that doesn't matter all it does is monitor it, it won't stop you from overheating.
If overheating was such a big problem don't you think there would be a company making the cooling kits and make millions?
Sorry, this isn't a debate on "if" these trucks overheat. Just responding to OP on issues that may contribute to the high transmission heat numbers.
To OP -which grades are problematic for you - maybe the pull back out of the S Fork Boise River from Pine/Featherville. This is a workout for my 06 LBZ pulling a 14K toyhauler. Tranny temps are well over 200* coming out of here. Imagine going up and over the hump going to the Boy Scout camp area (head waters of the S Fork Boise) from Fairfield would be the same but haven't done that one with this truck yet.
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