4L60E - When Does Fluid Flow To The Cooler?
Thread Starter
TECH Fanatic
Joined: Dec 2017
Posts: 1,466
Likes: 265
From: Bossier City, Louisiana
4L60E - When Does Fluid Flow To The Cooler? Hello,
I have a freshly rebuilt 4L60E in my Catalina that shifts very nicely but I have not gotten the transmission warmed up - very short test drives so far. When will I start to detect fluid flow out of the passenger side case ports? Is there a thermostat in the transmission that will eventually open up and allow fluid to flow or should I expect fluid to be flowing now when its cold?
My gut worry here is about potential leaks at those two case ports. I have none now but don't want a gusher to sprout when I begin to take longer test drives.
Rick
I have a freshly rebuilt 4L60E in my Catalina that shifts very nicely but I have not gotten the transmission warmed up - very short test drives so far. When will I start to detect fluid flow out of the passenger side case ports? Is there a thermostat in the transmission that will eventually open up and allow fluid to flow or should I expect fluid to be flowing now when its cold?
My gut worry here is about potential leaks at those two case ports. I have none now but don't want a gusher to sprout when I begin to take longer test drives.
Rick
TECH Junkie
Joined: May 2012
Posts: 3,045
Likes: 713
From: Poplarville, MS
Fluid will flow out of the bottom case port through the cooler and back into the transmission through the top port. The fluid will flow as long as the engine is spinning over. This means that fluid is flowing as soon as the starter is cranking over and all the while the engine is running. There is no thermostat in a 4L60E that controls fluid flow.
On The Tree
Joined: Aug 2021
Posts: 123
Likes: 30
From: Moscow
And in case any restrictions like bent rubber hose it can rise up to line pressure 200+ PSI at WOT and even more in reverse
There is no pressure release valve for oil cooler line (like some tranny has)
So avoid cheap tube type additional oil cooler - they rise pressure for no profit
There is no pressure release valve for oil cooler line (like some tranny has)
So avoid cheap tube type additional oil cooler - they rise pressure for no profit
Moderator
Joined: Aug 2010
Posts: 7,323
Likes: 529
From: Ann Arbor, MI
To prevent case port leaks, be sure to use the correct threaded hose adapters. They are not tapered NPT !! They are straight thread which need a washer or o-ring. Hmmm- was there a switch some year between washers and o-rings?? (I'm forgetting details.)
In any case (pun intended), a tapered NPT will crack the port over time.
In any case (pun intended), a tapered NPT will crack the port over time.
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TECH Enthusiast
Joined: Jan 2019
Posts: 677
Likes: 490
From: Roxana, IL
To prevent case port leaks, be sure to use the correct threaded hose adapters. They are not tapered NPT !! They are straight thread which need a washer or o-ring. Hmmm- was there a switch some year between washers and o-rings?? (I'm forgetting details.)
In any case (pun intended), a tapered NPT will crack the port over time.
In any case (pun intended), a tapered NPT will crack the port over time.
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