Piper Cherokee 140 nose cowling crack

Discussion in 'Maintenance Bay' started by jason gula, Jan 31, 2020.

  1. Timbeck2

    Timbeck2 Final Approach

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    cosmetic but in an odd place. I was thinking it was somewhere else. Repair as mentioned above, touch up with red paint and be done with it.
     
  2. mondtster

    mondtster En-Route

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    I, for one, would want to know how the hole got to be there and what the back side of the nosebowl looks like before making any determination on if I'd leave it alone for now or fix it. Judging by its location, I'd guess the baffling chafed it from the back side until it wore through.
     
  3. Timbeck2

    Timbeck2 Final Approach

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    Good point and would explain the odd location.
     
  4. jason gula

    jason gula Pre-Flight

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    Thats the answer I wanted to hear!! Will do and thanks.
     
  5. Timbeck2

    Timbeck2 Final Approach

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    But look on the back side and see if it is a wear through from the baffle or just a crack. Looks like a wear through from the picture. Wouldn't do any good to repair it only to have it wear through again.
     
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  6. jason gula

    jason gula Pre-Flight

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    Its in such an odd location its tough to see, but I don't believe there is anything behind it. I could be wrong, but it kind of looks like something hit it, creating the damage.
     
  7. mondtster

    mondtster En-Route

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    At a minimum, something was behind it at one time. That's right about where the alternator, alternator belt, and baffling is, all of which are close to the cowl. Easy or not, someone with knowledge of what is acceptable needs to look at the back side and insure that whatever rubbed the hole in it isn't going to keep rubbing.
     
  8. murphey

    murphey Final Approach PoA Supporter

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    Crud....I forgot to put the on the *silly* emoji there.
     
  9. jason gula

    jason gula Pre-Flight

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    I guess to expand a bit further, and again I'm new to this so I'm looking for some help, I have another thread here where today I found a 2" orange duct, disconnected with a loose clamp, which goes from the unfiltered air scoop on the bottom of the cowling, into a box which someone identified as the fuel pump/gascolator box. It definitely was connected and somehow came loose. Any chance this is related to the nose cowling damage? Vibration or something? Or just a coincidence all of a sudden.
     
  10. danhagan

    danhagan Pattern Altitude

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    Jason, find a mechanic that works with owners. Tell him you want to learn how to do your own oil changes. You'll learn how to cowl and de-cowl your plane. You'll be at a shop already if something bad turns up. You'll learn all your systems and how to check for other items that like to "get loose" like exhaust hangars, etc. If it doesn't have one, you'll spend $57 to put in a quick oil drain and learn how to safety wire. Recommend you also show up at annual and learn how to re-pack bearings, remove wheels ... these are all things you're allowed to do without being an A&P and will help you that much more on a pre-flight ESPECIALLY after maintenance.
     
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  11. jason gula

    jason gula Pre-Flight

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    will do thanks.
     
  12. Timbeck2

    Timbeck2 Final Approach

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    I was that "someone" :) in the other thread. I doubt the the damage was caused by the hose as it would have to jump over the hose from your nose cowl to the carburetor in order to hit that area. Seems like you have two separate issues, both of which (based on the information you provided) are not hard or expensive to fix.
     
  13. jason gula

    jason gula Pre-Flight

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    I'm on it. Thanks for the help.
     
  14. murphey

    murphey Final Approach PoA Supporter

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    Jason....is there an A&P school in your area? If so, consider taking the General course. You’ll learn safety wiring, what tools you should have, how to do an oil change, tires, batteries, what you’re allowed to do and what needs an A&P to do or sign off, and meet many students who want to be A&Ps. Some of those students will be very happy to help with owner-permitted work in exchange for airplane rides....
     
  15. Dan Thomas

    Dan Thomas Final Approach

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    Most likely. The aluminum baffle might have been replaced but not trimmed to ensure clearance between its edge and the cowl. The sealing strip is supposed to bridge the gap.

    I have seen holes worn in cowls by the baffle seal, too. Grit gets between the seal and cowl and turns the seal into sandpaper. Airplanes parked outside in dust storms can get that.
     
  16. jason gula

    jason gula Pre-Flight

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    Well I spoke with the previous owner today. He stated the baffling on the devious engine ended up chafing it. He stated new baffling was installed with the engine change. This occurred in 2014 so it’s been like this for 6 years now. I feel it will be fine then until I make the repairs.
     
  17. Tom-D

    Tom-D Taxi to Parking PoA Supporter

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    Within 6 years, it should have been repaired.
     
  18. Domenick

    Domenick Pre-takeoff checklist

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    I have not seen a hole, but the zinc chromate underside of my Warrior's cowling had been worn through by the old hard, OEM black baffling. I covered the worn and adjacent areas with metal foil duct tape. When I replaced the engine, I replaced all the aluminum baffling topped with blue silicon. When/if the metal tape ever shows wear, I'll simply replace it.

    https://www.homedepot.com/p/Nashua-...ulti-Purpose-HVAC-Foil-Tape-1207792/100030120
     
  19. Dan Thomas

    Dan Thomas Final Approach

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    I've seen that, and once I used a polyurethane anti-abrasion tape for the purpose, but the heat under the cowl loosened it and a piece found its way into the cold air inlet to the heat muff and made smoke in the cockpit. It could conceivably have ended up in the carb if carb heat had been applied. Not good at all. One has to be careful to look for unintended consequences.