Air checking 4l60e assembled trans?
Thread Starter
Staging Lane
Joined: Jan 2014
Posts: 61
Likes: 2
Air checking 4l60e assembled trans? Is there diagram of how to air check a assembled trans with the valve body off? The flow charts I'm finding are for the valve body it's self, not below the separator plate. Or is there a better way? Thanks
TECH Junkie
Joined: Jun 2008
Posts: 3,202
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From: Nitro Alley
If you assemble the transmission in the order shown in a ATSG manual:
-You can air-check the Low-Reverse clutch pack with the valve-body off
-You can air-check the separate chambers of the 2-4 Servo assembly with the valve-body off.
As far as air-checking the other clutch packs go, you would place your pump assembly down so that you could install the assembled reverse-input drum and assembled input drum all together... Air-checking these 4 clutch packs via the passages on the back-side of the pump assembly.
Note: if you build a good amount of these regularly... the pump assembly and valve-body can be modified into air-check tools to test the transmissions before final assembly.
This is something that I used to do when I was starting out with my business...
After you have done enough of these, you will develop a feel for most everything and not have to bother with making air-checking tools.
I also use a transmission run-stand these days.
-You can air-check the Low-Reverse clutch pack with the valve-body off
-You can air-check the separate chambers of the 2-4 Servo assembly with the valve-body off.
As far as air-checking the other clutch packs go, you would place your pump assembly down so that you could install the assembled reverse-input drum and assembled input drum all together... Air-checking these 4 clutch packs via the passages on the back-side of the pump assembly.
Note: if you build a good amount of these regularly... the pump assembly and valve-body can be modified into air-check tools to test the transmissions before final assembly.
This is something that I used to do when I was starting out with my business...
After you have done enough of these, you will develop a feel for most everything and not have to bother with making air-checking tools.
I also use a transmission run-stand these days.
As far as air-checking the other clutch packs go, you would place your pump assembly down so that you could install the assembled reverse-input drum and assembled input drum all together... Air-checking these 4 clutch packs via the passages on the back-side of the pump assembly.
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TECH Regular
Joined: Jan 2013
Posts: 463
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I've used these "step cut" input seals on 700s. Dana includes them in his kits. Petty good if you dont have access to the resizing tools. I also used the blue scarf cut seals on the stator. Not sure about scarf cut on the 4l60e?
TECH Regular
Joined: Jan 2013
Posts: 463
Likes: 179
I've used these "step cut" input seals on 700s. Dana includes them in his kits. Petty good if you dont have access to the resizing tools. I also used the blue scarf cut seals on the stator. Not sure about scarf cut on the 4l60e?
TECH Junkie
Joined: Jun 2008
Posts: 3,202
Likes: 1,390
From: Nitro Alley
Most people today use the "Steel/ Bonded Pistons", which makes things pretty much fool-proof.
It is easier for a beginner to have an issue with the lip-seals used on an early aluminum apply pistons.
As long as the Scarf-cut PTFE sealing rings were installed with the ring-ends correctly placed...
They usually air-check fine.
MAKE SURE that the small green O-Ring gets installed towards the bottom of the drum first or around the same time as the 3-4 clutch apply piston.
And make sure to lubricate it with assembly lube or ATF once it is installed.
This O-Ring is often forgotten by beginners.
I often crank up the line pressure on these units and prefer the solid-PTFE rings.
It is easier for a beginner to have an issue with the lip-seals used on an early aluminum apply pistons.
As long as the Scarf-cut PTFE sealing rings were installed with the ring-ends correctly placed...
They usually air-check fine.
MAKE SURE that the small green O-Ring gets installed towards the bottom of the drum first or around the same time as the 3-4 clutch apply piston.
And make sure to lubricate it with assembly lube or ATF once it is installed.
This O-Ring is often forgotten by beginners.
I often crank up the line pressure on these units and prefer the solid-PTFE rings.
Thread Starter
Staging Lane
Joined: Jan 2014
Posts: 61
Likes: 2
I didn't have any leaks on the low reverse piston or on the input drum assembly. The reverse drum is hard to air check and I should of air checked all three components as an assembly before installing them into the trans.
I used solid-PTFE O-rings and slid in pretty easily ( I alittle problem with resizing the pump O-rings for the rev-drum but got the slide in. I'm sure every thing will work, BUT I think of to many what ifs.
I used solid-PTFE O-rings and slid in pretty easily ( I alittle problem with resizing the pump O-rings for the rev-drum but got the slide in. I'm sure every thing will work, BUT I think of to many what ifs.
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Teching In
Joined: Jun 2022
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If you assemble the transmission in the order shown in a ATSG manual:
-You can air-check the Low-Reverse clutch pack with the valve-body off
-You can air-check the separate chambers of the 2-4 Servo assembly with the valve-body off.
As far as air-checking the other clutch packs go, you would place your pump assembly down so that you could install the assembled reverse-input drum and assembled input drum all together... Air-checking these 4 clutch packs via the passages on the back-side of the pump assembly.
Note: if you build a good amount of these regularly... the pump assembly and valve-body can be modified into air-check tools to test the transmissions before final assembly.
This is something that I used to do when I was starting out with my business...
After you have done enough of these, you will develop a feel for most everything and not have to bother with making air-checking tools.
I also use a transmission run-stand these days.
-You can air-check the Low-Reverse clutch pack with the valve-body off
-You can air-check the separate chambers of the 2-4 Servo assembly with the valve-body off.
As far as air-checking the other clutch packs go, you would place your pump assembly down so that you could install the assembled reverse-input drum and assembled input drum all together... Air-checking these 4 clutch packs via the passages on the back-side of the pump assembly.
Note: if you build a good amount of these regularly... the pump assembly and valve-body can be modified into air-check tools to test the transmissions before final assembly.
This is something that I used to do when I was starting out with my business...
After you have done enough of these, you will develop a feel for most everything and not have to bother with making air-checking tools.
I also use a transmission run-stand these days.
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TECH Enthusiast
Joined: Jan 2019
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From: Roxana, IL
I use an air test plate that I cut and drilled myself out of a piece of 1/2" of aluminum plate. I can test FWD, OR, 3-4, Rev, L/R, P/R, 2nd, 3rd & 4th circuits. I do need 2 sources of 40 psi to test the 2rd release..