4L60E check valves - Transmission Problems


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4L60E check valves

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Auto Repair Home>> Automotive Repair>> Transmission Problems

olebyker
New User

Jun 5, 2014, 11:34 AM

Post #1 of 4 (2587 views)

4L60E check valves	Sign In

there are two small captive check valves in the pump body, can someone tell me what their function is?

Also the check balls from the valve body, are 1/4" steel, all but one that appears to be delrin, or some type of plastic.
Is there a reason for one being different, or a specific location for this one?

(This post was edited by olebyker on Jun 5, 2014, 12:56 PM)

Discretesignals
Ultimate Carjunky / Moderator
Discretesignals profile image

Jun 5, 2014, 1:21 PM

Post #2 of 4 (2572 views)

Re: 4L60E check valves	Sign In

Both the overrun clutch and reverse input captive check balls in the pump housing are for allowing air to escape from their circuits when fluid pressure increases during clutch apply. They also unseat when their respective clutches release to allow air into the circuit to displace the exhausting fluid.

Steel check balls are heavy and hard and will wear out the separator plate as they are banging around. I've seen quite a few where they were stuck in the plate.
Torlon check balls aren't as aggressive and seal better.
The rubber or elastomer check balls are just as gentle on the plate, but they reduce in diameter as they wear out.

Someone was in the transmission before you. From the factory all 8 non captive check balls where steel.

Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.

(This post was edited by Discretesignals on Jun 5, 2014, 1:28 PM)

olebyker
New User

Jun 5, 2014, 1:44 PM

Post #3 of 4 (2564 views)

Re: 4L60E check valves	Sign In

You're right some has been in it before, that is the source of some of my problems. This is not torlon, as I recall they are dark grey, this is white.
As far as the check valves in the pump, do you know where I can find an illustration of location & orientation.

Discretesignals
Ultimate Carjunky / Moderator
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Jun 5, 2014, 2:04 PM

Post #4 of 4 (2561 views)

Re: 4L60E check valves	Sign In

Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.

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