REFLECTOR: Piston Crack -- Dye Penetrant Testing

Tom Cacek via Reflector reflector at tvbf.org
Mon Jun 15 16:24:18 CDT 2015


Won't be with 10 to 1's.  More "Feel Good" legislation, like lead ban for hunting/fishing.

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-----Original Message-----
From: Ron N VelocityXLFG via Reflector <reflector at tvbf.org>
To: John Dibble <aminetech at bluefrog.com>; Velocity Aircraft Owners and Builders list <reflector at tvbf.org>
Sent: Mon, Jun 15, 2015 12:34 PM
Subject: Re: REFLECTOR: Piston Crack -- Dye Penetrant Testing



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 Care full what you ask for . I hope the lead free gas is compatible with our tanks?
 
 
 
 Ron
 
 
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On 6/15/2015 11:16 AM, John Dibble via Reflector wrote:
  
 
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Looks like lead deposits.  Amazing how fast the lead builds up.  Can't wait for the lead-free avgas.
   
 
   
 John
   
 
   
 On 6/15/2015 9:12 AM, Bob Jackson via Reflector wrote:
   
 
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    <p class="aolmail_MsoNormal"><span style="font-size:12.0pt">While checking the valves (with my new eBay Dental camera 'borescope'), I happened to rotate it 180 degrees and noticed what appeared to be a crack in the top of the #3 piston.  The valves looked great, but a piston crack is scary.  The engine only has 75 hours on it and has not been abused operationally.  The cylinders and pistons were brand new from Continental (for our TNIO-550N).</span></p> 
    <p class="aolmail_MsoNormal"><span style="font-size:12.0pt"> </span></p> 
    <p class="aolmail_MsoNormal" style="text-align:center" align="center"><span style="font-size:12.0pt"><img id="aolmail_Picture_x0020_0" alt="Cyl-3_Piston_Before-2.jpg" height="432" width="576" src="https://mail.aol.com/webmail/getPart?uid=29551523&partId=1.2.2&saveAs=Image"></span><span style="font-size:12.0pt"></span></p> 
    <p class="aolmail_MsoNormal" style="text-align:center" align="center"><span style="font-size:12.0pt"> </span></p> 
    <p class="aolmail_MsoNormal" style="text-align:center" align="center"><span style="font-size:12.0pt">  <img id="aolmail_Picture_x0020_3" alt="Cyl-3_Piston_Before-4.jpg" height="265" width="353" src="https://mail.aol.com/webmail/getPart?uid=29551523&partId=1.2.3&saveAs=Image">  <img id="aolmail_Picture_x0020_4" alt="Cyl-3_Piston_Before-5.jpg" height="265" width="353" src="https://mail.aol.com/webmail/getPart?uid=29551523&partId=1.2.4&saveAs=Image"></span></p> 
    <p class="aolmail_MsoNormal"><span style="font-size:12.0pt"> </span></p> 
    <p class="aolmail_MsoNormal"><span style="font-size:12.0pt">The lighter gray marks between the crack and piston part # in the photo is where the top of the (plastic) dental camera hit the piston top when I was looking at the valves.  Here's the #3 exhaust and intake valves.</span></p> 
    <p class="aolmail_MsoNormal"><span style="font-size:12.0pt"> </span></p> 
    <p class="aolmail_MsoNormal" style="text-align:center" align="center"><span style="font-size:12.0pt"><img id="aolmail_Picture_x0020_5" alt="Cyl-3_ExhaustValve-4.jpg" height="333" width="444" src="https://mail.aol.com/webmail/getPart?uid=29551523&partId=1.2.5&saveAs=Image"></span><span style="font-size:12.0pt">  <img id="aolmail_Picture_x0020_6" alt="Cyl-3_ IntakeValve-1.jpg" height="216" width="288" src="https://mail.aol.com/webmail/getPart?uid=29551523&partId=1.2.6&saveAs=Image"></span></p> 
    <p class="aolmail_MsoNormal"><span style="font-size:12.0pt"> </span></p> 
    <p class="aolmail_MsoNormal"><span style="font-size:12.0pt">After a few days of head scratching and worry, we used a small wire brush and some AVGAS to clean off the top of the piston along the 'crack' line -- then took it out for an hour long flight (overhead the field at 6000').  I wanted to see if the crack line would re-appear in the exact same spot or not.  But after looking again after the test flight, there was no evidence of any line in the 'after' video -- the top of the piston looked smooth and clean where the stain/crack had been before.</span></p> 
    <p class="aolmail_MsoNormal"><span style="font-size:12.0pt"> </span></p> 
    <p class="aolmail_MsoNormal"><span style="font-size:12.0pt">My questions are:</span></p> 
    <p class="aolmail_MsoListParagraph" style="text-indent:-.25in;mso-list:l0 level1 lfo1"><span style="font-size:12.0pt;font-family:Symbol"><span style="mso-list:Ignore">·<span style="font:7.0pt
                  "Times New Roman"">         </span></span></span><span style="font-size:12.0pt">has anyone seen similar 'crack's or 'oil tracks' on the tops of pistons?</span></p> 
    <p class="aolmail_MsoListParagraph" style="text-indent:-.25in;mso-list:l0 level1 lfo1"><span style="font-size:12.0pt;font-family:Symbol"><span style="mso-list:Ignore">·<span style="font:7.0pt
                  "Times New Roman"">         </span></span></span><span style="font-size:12.0pt">could it be a splash or 'seep' line of oil or fuel that appears possibly just as the engine is shutting down?</span></p> 
    <p class="aolmail_MsoListParagraph" style="text-indent:-.25in;mso-list:l0 level1 lfo1"><span style="font-size:12.0pt;font-family:Symbol"><span style="mso-list:Ignore">·<span style="font:7.0pt
                  "Times New Roman"">         </span></span></span><span style="font-size:12.0pt">has anyone ever done dye penetrant testing of pistons before through the spark plug holes?</span></p> 
    <p class="aolmail_MsoListParagraph" style="text-indent:-.25in;mso-list:l0 level1 lfo1"><span style="font-size:12.0pt;font-family:Symbol"><span style="mso-list:Ignore">·<span style="font:7.0pt
                  "Times New Roman"">         </span></span></span><span style="font-size:12.0pt">would the dye penetrant residuals likely damage anything or contaminate the oil?</span></p> 
    <p class="aolmail_MsoNormal"><span style="font-size:12.0pt"> </span></p> 
    <p class="aolmail_MsoNormal"><span style="font-size:12.0pt">We're trying to gather some data and perspective before talking to Continental and the rebuilder and would appreciate your comments or suggestions.</span></p> 
    <p class="aolmail_MsoNormal"><span style="font-size:12.0pt"> </span></p> 
    <p class="aolmail_MsoNormal"><span style="font-size:12.0pt">Thanks,</span></p> 
    <p class="aolmail_MsoNormal"><span style="font-size:12.0pt">Bob Jackson</span></p> 
    <p class="aolmail_MsoNormal"><span style="font-size:12.0pt">Velocity XL/RG/XC</span></p> 
    <p class="aolmail_MsoNormal"><span style="font-size:12.0pt">TNIO-550N</span></p> 
    <p class="aolmail_MsoNormal"><span style="font-size:12.0pt">1000 hrs</span></p> 
    <p class="aolmail_MsoNormal"><span style="font-size:12.0pt">N2XF</span></p> 
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