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Exhaust valve lapping

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pnicholson

Joined: 04 Jun 2011
Posts: 46

Posted: Fri May 06, 2016 4:13 am Post subject: Exhaust valve lapping

Good day,  

My number four cylinder compression has dropped considerably since the last annual to 50/80.  All other cylinders are over 70.  We have determined the exhaust valve is leaking. We have staked the valve but with little success.  My AME (new to the housai) is ready to lap it but doesn’t know the correct grinding details (dimensions/angles) for the valve seats and the intake and exhaust valves.  If anyone has this information or helpful hints on the process, please advise.  

   

Thanks,  

   

Phil Nicholson  

C-FEPN – Ottawa

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wlannon(at)shaw.ca
Guest

Posted: Fri May 06, 2016 8:55 am Post subject: Exhaust valve lapping

Phil;

  

 Have you checked the valve clearances?   These should be checked  and adjusted as required every 50 hrs or so.

 These engines seem to have a tendency for the exhaust valve to lose  clearance over time.  If not corrected the valve will not fully  close.

  

 If you decide to remove the cylinder be aware #4 is the master rod cylinder  and special precautions apply.   

  

 Walt

  

  

  

  

   From: Philip Nicholson (pednicholson(at)gmail.com) 

 Sent: Friday, May 06, 2016 5:12 AM

 To: Yak-List (Yak-List(at)matronics.com) 

 Subject: Exhaust valve lapping

  



   

Good  day, 

My number  four cylinder compression has dropped considerably since the last annual to  50/80.  All other cylinders are over 70.  We have determined the  exhaust valve is leaking. We have staked the valve but with little  success.  My AME (new to the housai) is ready to lap it but doesn’t know  the correct grinding details (dimensions/angles) for the valve seats and the  intake and exhaust valves. If anyone has this information or helpful hints on  the process, please advise. 

  

Thanks, 

  

Phil  Nicholson 

C-FEPN –  Ottawa

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cjpilot710(at)aol.com
Guest

Posted: Fri May 06, 2016 7:31 pm Post subject: Exhaust valve lapping

If I remember correctly the angle is 45deg.  However check with George Coy or Jill at M14.



Sent from my iPad from some where on The 3rd rock from the Sun.



On May 6, 2016, at 05:12, Philip Nicholson <pednicholson(at)gmail.com (pednicholson(at)gmail.com)> wrote:

 	  Quote: 	
		    

Good day,  

My number four cylinder compression has dropped considerably since the last annual to 50/80.  All other cylinders are over 70.  We have determined the exhaust valve is leaking. We have staked the valve but with little success.  My AME (new to the housai) is ready to lap it but doesn’t know the correct grinding details (dimensions/angles) for the valve seats and the intake and exhaust valves.  If anyone has this information or helpful hints on the process, please advise.  

   

Thanks,  

   

Phil Nicholson  

C-FEPN – Ottawa

- The Matronics Yak-List Email Forum -

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

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