Induction Riser Pin Hole

Discussion in 'Maintenance Bay' started by Hunter, May 17, 2017.

  1. Hunter

    Hunter Pre-Flight

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    At last oil change, I found a pin hole leak in my #4 Induction Riser. Continental is covering it under warranty, but what scares me is that you can see a ground down spot where they saw a problem with it before it left the factory, and the part still ended up on my engine!!

    Does anyone have experience in dealing with warrantied parts, and getting reimbursed for the labor? I'm curious as to how this is going to play out.
     

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  2. Briar Rabbit

    Briar Rabbit Pre-Flight

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    Obvious that somebody screwed up at the factory. Man they should pay the whole bill on this one. If they show any sign of not bellying up to the bar I would make sure they know you intend to bring in the FAA. Let us know how this plays out! What engine and how old is it hours and calendar?
     
  3. Hunter

    Hunter Pre-Flight

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    ....Meant to put this in OP

    Factory Reman O-470R
    90 Hours
    installed August 2016
     
  4. Briar Rabbit

    Briar Rabbit Pre-Flight

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    I have a reman IO-520 built in the same month I am now going to inspect this week end. Thanks for the heads up!
     
  5. GlennAB1

    GlennAB1 En-Route

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    Rotary filed. Must have been gouged.
     
  6. Briar Rabbit

    Briar Rabbit Pre-Flight

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    You might want to discuss any potential damage done to the cylinder as it might have been operating too lean. Do you have an engine monitor that records that cylinder's egt & cht? I had a top on an engine once and the intake gasket on the jug leaked. Ran it about 10 hours until I discovered it. I had to pull the jug and rehone the cylinder. Maybe discuss pulling that cylinder and inspecting if you do not have a monitor since it was a brand new cylinder?
     
  7. Hunter

    Hunter Pre-Flight

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    I have a EDM 930, but the #4 cylinder has been normal. The #2, however, has been hot from the get go. Could an induction leak down the line be causing this?? I mentioned the problems I've had with the #2 cylinder in the original correspondence with Air Power, and they told me to check:

    "Cooling baffles missing, broken/bent
    Partially plugged fuel nozzle
    Engine improperly timed
    Exhaust gas leak onto cylinder
    Loose CHT lead or faulty probe"
     
  8. Briar Rabbit

    Briar Rabbit Pre-Flight

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    Here are my spur of the moment thoughts. I would certainly check to make sure the wire to the #4 lead is not swapped with the #2 lead? What have the Cht's and Egt temps been running for both cylinders? I can not imagine why a leak in the intake manifold could lead to an adjacent cylinder running hot, my bet is a lead for the EDM hooked up wrong? I would be tempted to pull the lead out from under the #4 plug, zip tie it to the spark plug lead away from the jug and run it and see if 2 or 4 stays on the peg? Then you could confirm there is not an unlikely mistaken electrical path inside the EDM unit? Is the spark plug(s) installed in #2 correct where the cht lead is placed? Does the engine run smooth on each individual mag, if not which jug is running cool on one mag during ground run up? You have an O-470 so no injectors, scratch off Airpowers second suspect cause. Loose nut or bad gasket at the #2 jug inlet (same problem I had once)? I have had probe failures but they generally are obvious? If you have an exhaust gas leak blowing on the #2 probe I would think you would see discoloration at the joint area? How many hours do you have on this new engine? Hope these thoughts help!
     
  9. nrpetersen

    nrpetersen Pre-takeoff checklist

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    Those marks are from the snagging grinder which is done at the foundry by workers separating the raw castings from the sand after everything has cooled down. That is just awful quality. Hard to imagine it got thru Continental manufacturing much less final engine test. A local aircraft engine rebuilder noted he once saw a Continental connecting rod with a blow hole in it.
     
  10. Briar Rabbit

    Briar Rabbit Pre-Flight

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    Hunter, here is a video from you tube showing a sophisticated method of checking for an induction leak. Before you go,to this much effort check to make sure you do not have a loose fastener.

     
  11. PaulS

    PaulS Final Approach

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    Although that is kind of an odd location I wonder if that is a gate or a pouring hole. Would be curious to see if another one looked the same. Regardless, crappy QC. A screw and some silicone would fix that right up. ;) Most of this casting is done in Mexico now and sometimes the quality really sucks.