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Old 05-09-2006, 05:57 PM
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input drum air check

When I air check the pistons in the input drum I get a hiss from all three. I have taken the input drum apart and I cannot find any problems with the seals...moulded seals by the way. Can the seals be bad even though they visually check out?

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Old 05-09-2006, 06:39 PM
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Quote:
Originally Posted by rocmemphis
When I air check the pistons in the input drum I get a hiss from all three. I have taken the input drum apart and I cannot find any problems with the seals...moulded seals by the way. Can the seals be bad even though they visually check out?
give us a clue on what tranny your are working on.
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Old 05-09-2006, 09:13 PM
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Quote:
Originally Posted by Crosley
give us a clue on what tranny your are working on.
Sorry about that. Late model 4L60E.
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Old 05-10-2006, 08:09 AM
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Quote:
Originally Posted by rocmemphis
Sorry about that. Late model 4L60E.
did you replace the small O ring seal down inside the drum?

have you located the hissing sound? Sometimes the input shaft is loose at the aluminum drum
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Old 05-10-2006, 11:33 AM
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Quote:
Originally Posted by Crosley
did you replace the small O ring seal down inside the drum?

have you located the hissing sound? Sometimes the input shaft is loose at the aluminum drum
Yes the o ring seal has been replaced. I also cannot pinpoint the hissing. Would a loose input shaft require a entirely new drum?
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Old 05-10-2006, 03:43 PM
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A little update on this. I bought a new forward, overun, and 3-4 piston. I am still getting the same problem. When air is applied to the 3/4 feed I can hear hissing from the drum. When air is applied to the overun feed and the piston is at its maximum travel air leaks from all sides. Any ideas?
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Old 05-10-2006, 06:54 PM
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Quote:
Originally Posted by rocmemphis
A little update on this. I bought a new forward, overun, and 3-4 piston. I am still getting the same problem. When air is applied to the 3/4 feed I can hear hissing from the drum. When air is applied to the overun feed and the piston is at its maximum travel air leaks from all sides. Any ideas?

you are air checking the drum with all the friction packs installed and set at proper clearance? If not , you are over extending the pistons

There is a very small piisser hole for the 3-4 piston that is on the input shaft side of the drum.

you can place some oil around the input shaft area where it is pressed into the drum. Air check and watch for bubbles. You will also se the piisser hole for 3-4 if you are not sure where it is.
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Old 05-10-2006, 08:53 PM
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3-4 oil is linked to the forward pack, esp. when the clearance is too loose.
Overrun oil/air will leak to forward oil. It's supposed to...
If you think the 3-4 air check leaks oil to the forward pack feed you should have air exiting the forward feed at the input shaft when you air check the 3-4 pack..........
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Old 05-10-2006, 11:16 PM
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Little Balls

Could it be leaking from those little check balls in the drum?
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Old 05-11-2006, 05:32 AM
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leak

What psi are you checking it with????

Keith
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Old 05-11-2006, 05:59 AM
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Thanks for the help everyone. I finally got it figured out.

***solution omitted as it might make me look like a numbnut***

Last edited by rocmemphis; 05-11-2006 at 07:10 AM.
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Old 05-11-2006, 08:30 PM
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Quote:
When air is applied to the overun feed and the piston is at its maximum travel air leaks from all sides. Any ideas?
this sentence makes me wonder. Since you cannot really see the piston edges when the drum is loaded with frictions.

Good to read you have figured the problem out and can move forward......

LOL ..... get it? move forward??

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