rear cowl flap motor issue

[B2C2]

Hi. I have looked through the forum and understand this is a known failure mode for this airplane. On my 1969 T337D I was preparing to leave Carlsbad on Sunday but when I hit the switch to open the rear cowl flaps I didn't hear the motor running. Sure enough the flaps were not opening. I tried puling and resetting the breaker, and looked for any loose wires on the switch in the panel (the motor was inaccessible due to closed rear cowl flaps making it not possible to get the panels off). After about 20 minutes of messing around with no apparent effect, suddenly it decided to work. I flew it home and exercised the motor once I was back on the ground in Livermore where I am based. It is now running. I did hear a slight hitch in it on one cycle but it seems to be running without issue. My question is for those of you who have had this fail, does it fail hard or is it intermittent? I am wondering if I may have a loose connection somewhere and this is causing the problem and not the motor. There is also a reference to cleaning of the motor assembly in the forum, which I may have my mechanic do if it looks like the motor is the issue. the motor is now about $7800 from Cessna, and about $6K on line from others so i'd like to understand where I may be having an issue and not just swap it out.

[hharney]

B2C2, have the motor cleaned and inspected by someone that understands small low voltage DC motors. Have your A&P install it and make sure it is working properly to make the correct log book entry. Yeah it's not 100% by the book but that's all you can do.

The little motors get moisture in there and the grease dries up. Service will hopefully do the trick

[B2C2]

Hi Herb

okay thanks, I will give that a try. The plane is going in for annual soon so Ill use the opportunity to have this done. I hate these intermittent problems. You are never sure if they are actually fixed.

[Jerry De Santis]

I agree with Herb. They are very simple motors and easy to have cleaned. Also, since your plane is not pressurized, I understand that there is a conversion kit that you can install and eliminate the motor. Maybe someone on this site has more information regarding it.

Cheers
Jerry

[LostKiwi]

http://www.cessnaskymaster.com/mech-...ol-system.html

I don't have that mod installed, so I can't comment on whether its any good or not, but $1495 is a lot cheaper than 7800 bucks for a new motor!

http://www.cessnaskymaster.com/cowl-flap-motors.html

Looks like they do exchange/overhaul of motors too if it comes to that.



Leighton.

[Kim Geyer]

Try Georges Electrical Service in Sacramento CA 916 922-4277. The overhauled 2 for me about a year ago for $700.00 each. It may be more if it has a brake on it.
Talk to Michael Headley
Kim

[Skymaster337B]

Check out this older post http://www.337skymaster.com/messages...hp/t-3471.html

RLB accessories rebuilt my motor for hundreds of dollars....not thousands.

He fixed it, returned it with invoice in box, used the trust system for me to pay. Good dude.