Fresh Air Vent Repair

[GeneralT001]

Hi,

The fresh air vent down by the pilots knee leaks air badly and I would like to fix it. Is there any info on how to go about this repair...I'm guessing its fairly simple and have searched the forums with out any luck...if someone could steer me in the right direction

[carusoam]

Eyeball vents are easy to clean, lubricate, and or replace…

They are easy to find…

Seem to last forever…

Best regards,

-a-

[KB4]

4 screws hold the flange, remove those and that eyeball assembly comes right out. 

[GeneralT001]

3 hours ago, KB4 said:

4 screws hold the flange, remove those and that eyeball assembly comes right out. 

Finally...something relatively simple to try and fix

[carusoam]

2 minutes ago, GeneralT001 said:

Finally...something relatively simple to try and fix

Right after that…

you will looking for tubing health for delivering air from the heat and outside air…

Still something you can fix… just a little more challenging…

-a-

[Marc_B]

On 2/6/2022 at 9:32 PM, carusoam said:

Eyeball vents are easy to clean, lubricate

@carusoam I have a few vents that are a tad sticky.  what's the best product to clean and lube with?  silicone spray?  looking for a rec that doesn't attract grime and doesn't add a smell.

[carusoam]

On 8/20/2022 at 1:58 PM, Marc_B said:

@carusoam I have a few vents that are a tad sticky.  what's the best product to clean and lube with?  silicone spray?  looking for a rec that doesn't attract grime and doesn't add a smell.

Great question…

There is probably a right answer for this… found in the service manual….

But, I most likely used WD40 as the cleaner…a version of Tri-flo for lubrication….  
 

Good for washing out aluminum dust left from wear….
 

As far as aroma goes… I couldn’t tell.  Age + olfactory senses….  

Best regards,

-a-

[PT20J]

The only way I have found to fix sticky  wemac vents is to take them apart and thoroughly clean them. If you spray them from the outside with silicone, it just loosens the eyeball but doesn’t do much to loosen the butterfly mechanism so when you try to adjust them all that happens is that the eyeball spins around without changing the airflow. It’s possible spraying them with brake cleaner might wash the gunk out — I haven’t tried that,

On my M20J, they are attached to the inside of the NACA scoops with sealant and then covered with the carpeted side panel and then everything is held in place with the trim ring. So, to get them out, I had to remove the trim ring and then the carpeted panel. Once out, there is a metal strip on the back that can be pulled out with long nose pliers and then the parts can be removed and cleaned and lubricated with a little silicone spray. Be sure to replace the sealant. I used regular hardware store duct sealant.

Skip

[Marc_B]

1 hour ago, carusoam said:

There is probably a right answer for this… found in the service manual….

This is the only reference to the Wemac valves that I can find in the service manual...and surprisingly no mention of interior item lubrication in the lubrication and service chart in the manual.  Service manual interior limited to flight controls and doors/seals recommendations.

Thanks for the the suggestions @carusoam and @PT20J

[PT20J]

3 minutes ago, Marc_B said:

This is the only reference to the Wemac valves that I can find in the service manual...and surprisingly no mention of interior item lubrication in the lubrication and service chart in the manual.  Service manual interior limited to flight controls and doors/seals recommendations.

Thanks for the the suggestions @carusoam and @PT20J

I don’t think they are intended to be lubed and any lube that leaves an oily residue is just going to gunk them up eventually.