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jgswartout(at)gmail.com
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 Posted: Thu Sep 18, 2008 3:23 am Post subject: Leaking 801 flap motor gear box |
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Dear Listers:
I received my flap motor assembly, made by Commercial Aircraft Products of Wichita, KS (model # D145-00-36-3) from ZAC about 5 years ago. It sat in the box for a couple of years until I got ready to install it, and I then discovered it had leaked quite a lot of oil--I'd guess a couple of tablespoons. After I installed it, it has continued to leak oil for a couple more years, staining the cabin floor and creeping back beneath the rear seat. I discussed the leak with ZAC when I discovered it. They didn't think it was anything to worry about (i.e. they were not eager to replace it without some proven defect).
The leaking has subsided--most likely because almost all of the oil has already leaked out. Well, I'm going to fly the airplane in a few months, and this apparent defect has been bothering me for quite a while. So I talked to a technician at Commercial Aircraft Products about it. He said it is possible that the gear box could leak, but it really shouldn't unless subjected to heat/stress/etc. He also said that he has overhauled these units that have been use in the field for 15 years, have no oil in them, and they still work. A leak could be due to a poorly seated seal around the motor shaft, a bad seal at the jackscrew shaft, or debris compromising a seal, or a cracked housing. He suggested I ask ZAC for a replacement if I am concerned about it. So that's what I did.
ZAC returned the same unit to me, saying they "could find nothing wrong with the flap motor."
A casual inspection would reveal that the motor runs and the gear box does not appear to leak. That does not mean it isn't defective. It doesn't leak because it's been leaking for 5 years and there's nothing left to leak out.
I am about to disassemble the gear box, re-install the jackscrew seal with a gasket sealer, and refill the gearbox with lubricant. ZAC told me I cannot get replacement parts for these units, so if I make any errors, I'm stuck with a $600 boat anchor. I shouldn't have to do this, but I don't want to install a defective motor into a new airplane.
I would like to know if others have had any similar experiences with these flap motor gearboxes leaking oil.
John
[quote][b]
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n85ae
Joined: 14 Mar 2007
Posts: 403
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| Posted: Thu Sep 18, 2008 5:38 am Post subject: Re: Leaking 801 flap motor gear box |
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Once you get the seal out, you should be able to find a replacement
at McMaster Carr. Just measure it, and look through their catalog for
a dimensionally equivelant part. http://www.mcmaster.com
Jeff
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jgswartout(at)gmail.com
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| Posted: Fri Sep 19, 2008 7:02 pm Post subject: Leaking 801 flap motor gear box |
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Thanks, Jeff. I showed it to an auto parts store person, and they said they could probably match it, even if it weren't a direct replacement. I will need to place an order to McMaster-Carr anyway, for some O-rings. Thanks for the tip.
John
On Thu, Sep 18, 2008 at 9:38 AM, n85ae <n85ae(at)yahoo.com (n85ae(at)yahoo.com)> wrote:
[quote]--> Zenith701801-List message posted by: "n85ae" <n85ae(at)yahoo.com (n85ae(at)yahoo.com)>
Once you get the seal out, you should be able to find a replacement
at McMaster Carr. Just measure it, and look through their catalog for
a dimensionally equivelant part. http://www.mcmaster.com
Jeff
Read this topic online here:
[url=http://forums.matronics.com/viewtopic.php?p 4910#204910]http://forums.matronics.com/viewtopic.php?p 4910#204910[/url]
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