4r100 temp issue
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Joined: Apr 2009
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4r100 temp issue
Hey guys so i posted a little while back that my trans is getting hot after i had a shop rebuild it. i had gotten the temp up to about 220 UNLOADED.
here is what the truck is running right now.
I replaced the 26 row cooler (OEM)
I bypassed the rad cooler for the trans so now its just out of the trans to the 26 row cooler and back
I also have a diesel site external trans filter which has a brand new filter and the lines have been blown out.
The truck was dropped off to the shop that rebuilt the trans and he is saying nothing is wrong with the temp reading.
The line coming out of the trans is HOT and the line coming back is ICE cold. Even my external filter is ice cold. Before my trans let go I always felt some heat coming off of the external filter so I knew it was circulating. Could it be that the bypass valve is no good and its just circulating fluid through the body of the trans?
Once i get the truck back i have two temp probes i will install on the feed and return lines and insulate them, take it for a drive and see what i am reading.
When i read the 220 it was on my scanguage but i was advised that the OEM temp prob isnt an accurate reading by the trans shop????? basic knowledge would say if one line is really hot and the other isnt at all lukewarm than something is going on.
Any help is greatly appreciated
AJ
here is what the truck is running right now.
I replaced the 26 row cooler (OEM)
I bypassed the rad cooler for the trans so now its just out of the trans to the 26 row cooler and back
I also have a diesel site external trans filter which has a brand new filter and the lines have been blown out.
The truck was dropped off to the shop that rebuilt the trans and he is saying nothing is wrong with the temp reading.
The line coming out of the trans is HOT and the line coming back is ICE cold. Even my external filter is ice cold. Before my trans let go I always felt some heat coming off of the external filter so I knew it was circulating. Could it be that the bypass valve is no good and its just circulating fluid through the body of the trans?
Once i get the truck back i have two temp probes i will install on the feed and return lines and insulate them, take it for a drive and see what i am reading.
When i read the 220 it was on my scanguage but i was advised that the OEM temp prob isnt an accurate reading by the trans shop????? basic knowledge would say if one line is really hot and the other isnt at all lukewarm than something is going on.
Any help is greatly appreciated
AJ
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More Turbo
Joined: Apr 2009
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as soon as I get my external temp readings I will post back
Frmr Ford Trans Engr
Joined: Aug 1999
Posts: 24,739
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From: SE Florida
The OEM sensor is the most accurate reading. The shop is wrong.
Tuned
Joined: Mar 2016
Posts: 354
Likes: 0
They are full of crap. You can't have a HOT and ICE COLD line and have sufficient flow thru a cooler. They just aren't that efficient.
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More Turbo
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Exactly! I wasn't born yesterday. I've worked with diesel engines for 16 year and never saw a radiator work at 100 + efficiency! Same thing goes for the trans cooler. Once i have the truck back ill chck it myself. I believe it may be that bypass valve.
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More Turbo
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it takes about 40 min to get around 200. Fan is running. Oil temp is right with coolant so like 180 190. This isn't normal for my truck. Before I had issues the truck would run no problem at 160 unloaded in the dead of summer. Once I put the 26 row cooler my temps dropped from 190 normal to 160 165
Post Fiend
Joined: Mar 2015
Posts: 5,277
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From: Blairsville, Pennsylvania
Well, sounds like you have the needed data to back up the proper operation of your truck.
Might be time to have another talk with your trans builder.
Failing that, here's and idea. What if you took your output line and connected it to your input line, bypassing the cooler? Then see if the return line gets hot as well- to match the output line.
If it doesn't there is no flow. If it does, check your cooler for obstructions.
But wait for Mark K to weigh in on this idea first. Transmissions can be picky and I am not a transmission expert.
Might be time to have another talk with your trans builder.
Failing that, here's and idea. What if you took your output line and connected it to your input line, bypassing the cooler? Then see if the return line gets hot as well- to match the output line.
If it doesn't there is no flow. If it does, check your cooler for obstructions.
But wait for Mark K to weigh in on this idea first. Transmissions can be picky and I am not a transmission expert.
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Billyclub
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Dec 31, 2011 01:15 PM