Gascolators

Discussion in 'Maintenance Bay' started by Tom-D, Sep 14, 2018.

  1. Tom-D

    Tom-D Taxi to Parking

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    Started new thread because Yes it was major thread creep on the forum.

    This is why I inspect the gascolator on every annual.
    The pictures below are of a Gascolator I removed from a 150, I don't believe it had ever been off prior to this. You'll see the corrosion that occurs in these fuel strainers, you can see the brass 100 mesh screen, which is supposed to separate the water from the fuel, From the looks of it it has never been cleaned or serviced. The "O" ring is hard and brittle, and the whole assembly is dirty, corroded.
    Those that believe these do not require inspecting just because they have no AD, are the inspectors you do not want doing your annual.
     

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  2. timwinters

    timwinters Touchdown! Greaser! PoA Supporter

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    From the 100 hr / annual inspection checklist in my 182's service manual:

    2-15

    Fuel System
    1. Fuel strainer for internal cleanliness, security, leaks, and safetying; drain valve and control for proper rigging, operation, leaks, and security.
     
  3. Dan Thomas

    Dan Thomas En-Route

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    That O-ring came off in one piece? Can't be more than 20 or 30 years old;) I sometimes see them crumble into little bits when they come off.

    I think a lot of airplanes get maintained like cars. Fix it when it quits. That's usually when the fuel filter on a car gets replaced.
     
  4. Tom-D

    Tom-D Taxi to Parking

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    It's pretty evident that some inspectors don't use that as the required list as mentioned in FAR 43-D.
     
  5. kyleb

    kyleb En-Route

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    I replaced the gasket on mine at the last condition inspection. When I pulled the gascolator to clean/check the screen, I found that the gasket had turned brittle - it actually cracked when I flexed it. So I flexed it again. And a new crack formed. Another $3.50 down the tubes. ;-)
     
  6. Dan Thomas

    Dan Thomas En-Route

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    That's a really old gasket. The screen gasket usually lasts quite a while. It's the two O-rings that should be replaced periodically: The MS29513-111 at the bottom, and the MS29513-138 at the top, in the groove where the top of the bowl goes. Then there's the MS29513-010 inside the top body, to seal the plunger shaft. That one is plenty of fun to replace, especially in a crowded compartment.

    The above applies to the typical legacy Cessna strainer. There are numerous other types. When strainers get too old and worn out, repairs can be expensive. Steve's Aircraft has STC'd gascolators that are easier to work with: https://www.stevesaircraft.com/gascolator.php
     
  7. Tom-D

    Tom-D Taxi to Parking

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  8. Dan Thomas

    Dan Thomas En-Route

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    O-rings aren't the issue. Rotted-out bowls, failed plunger tips, standpipes chewed up by mechanics using vise grips, or their valve seats corroded and leaking, screens falling apart: those are the issues. Even the aftermarket parts aren't cheap. The Steve's gascolator uses a single reusable O-ring (metric, mind you, so order spares), a simple screen disc, and you install your own curtis drain valve in the bottom. Cheap to maintain and real easy to open and clean.
     
    Last edited: Sep 15, 2018
  9. Dan Thomas

    Dan Thomas En-Route

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  10. flyingron

    flyingron Touchdown! Greaser!

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    Yep, especially if you find the pilot has been illegally running some amount of unknown autogas in the thing. We've found some Navion crashes that we're pretty sure were caused by ethanol. There are no STCs for autofuel in the NAVION and there are no STCs that permit any amount of ethanol in the autofuel they allow.
     
  11. Tom-D

    Tom-D Taxi to Parking

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    They are the only issue when you do the inspection and find a good unit.
    If you don't find a good unit, 99% of owners will call salvage and get another.
    I don't believe I would advise any owner to buy a $300 replacement when a used good unit is $100 or less.
     
  12. Let'sgoflying!

    Let'sgoflying! Touchdown! Greaser!

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    does this gascolator look ok? 3FB5B36A-816C-4BD9-A8F2-14BBFDB23E98.jpeg
     
  13. Tom-D

    Tom-D Taxi to Parking

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  14. Let'sgoflying!

    Let'sgoflying! Touchdown! Greaser!

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    Looking into it today, will fix up.
     
  15. kyleb

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    My gascolator has one gasket and an o-ring in the drain. The assembly is inspected every year and parts are replaced as necessary. It is a 10 minute job, including the leak check afterwards.
     
  16. Salty

    Salty Pattern Altitude

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    This is of extreme importance, but a chunk of broken metal inside the engine is no big deal? Ok.
     
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  17. JAWS

    JAWS Line Up and Wait

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    They are both serious.

    You have to wade through the BS and diatribes to find any value. Welcome to the internet - take everything with a large grain of salt and do your own homework to make your own decision.
     
  18. Let'sgoflying!

    Let'sgoflying! Touchdown! Greaser!

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    Wrong thread?
     
  19. Salty

    Salty Pattern Altitude

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    Not me. You?
     
  20. Let'sgoflying!

    Let'sgoflying! Touchdown! Greaser!

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    Oh, I thought perhaps you thought you were in this thread about the metal part in the engine; if not ignore.
     
  21. JAWS

    JAWS Line Up and Wait

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    Welcome to cheap and fast annuals. Complacency at its finest!
     
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  22. Salty

    Salty Pattern Altitude

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    No. I was comparing the two threads. Perhaps reread my post?
     
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  23. Gary Austin

    Gary Austin Pre-Flight

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