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Engine Mount Hole Alignment to Firewall

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owl40188(at)yahoo.com
Guest

Posted: Mon Feb 12, 2007 8:23 am Post subject: Engine Mount Hole Alignment to Firewall

I tried to drill the engine mount holes in the firewall this weekend.  After drilling the left upper hole first (pilots side) I noticed that the firewall pilot hole on the upper right side is about 3/16 inch off (outboard.)  The lower holes are not too bad.  I sent an email to Vans asking if I should simply stretch the engine mount frame into place since it appears I can pull it into place with just my hands (no clamps ).  Here is the response.

  

 "Since the engine mount weldment moves somewhat when it it 

removed from the jig, we don't expect all the holes to line up.  If 

after drilling the upper left hole, some of the other holes seem to be 

fairly close, drill them first.  Drill the upper right hole last.  Don't 

force the mount into position."

  

 I am including this since when I did a search on the archives I found references to forcing the mount into position.

  

 Following the recommended procedure it would be interesting if one has to replace an engine mount frame.  I hope they all move the same amount after removal from the jig.

  

  

 Niko

 40188



  

  



 [quote][b]

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armywrights(at)adelphia.n
Guest

Posted: Tue Feb 20, 2007 8:56 pm Post subject: Engine Mount Hole Alignment to Firewall

I have “encouraged” my engine mount into position while installing bolts.  I wonder what real problems there could be in that little bit of static tension, as long as it’s not using a winch to stretch the thing.  I’m thinking that it may reduce the amount of settling that many experience.  

   

Rob  

#392  

Cleaning up emails from a week of vacation – need a blackberry!  

         

  

From: owner-rv10-list-server(at)matronics.com [mailto:owner-rv10-list-server(at)matronics.com] On Behalf Of Niko

 Sent: Monday, February 12, 2007 10:23 AM

 To: Matronics

 Subject: Engine Mount Hole Alignment to Firewall  

  

       

I tried to drill the engine mount holes in the firewall this weekend.  After drilling the left upper hole first (pilots side) I noticed that the firewall pilot hole on the upper right side is about 3/16 inch off (outboard.)  The lower holes are not too bad.  I sent an email to Vans asking if I should simply stretch the engine mount frame into place since it appears I can pull it into place with just my hands (no clamps ).  Here is the response.  

    

   

    

"Since the engine mount weldment moves somewhat when it it 

 removed from the jig, we don't expect all the holes to line up.  If 

 after drilling the upper left hole, some of the other holes seem to be 

 fairly close, drill them first.  Drill the upper right hole last.  Don't 

 force the mount into position."  

    

   

    

I am including this since when I did a search on the archives I found references to forcing the mount into position.  

    

   

    

Following the recommended procedure it would be interesting if one has to replace an engine mount frame.  I hope they all move the same amount after removal from the jig.  

    

   

    

   

    

Niko  

    

40188  

    

   

    

   

  

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       [quote][b]

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owl40188(at)yahoo.com
Guest

Posted: Wed Feb 21, 2007 11:09 am Post subject: Engine Mount Hole Alignment to Firewall

Hi Rob,

  

 I don't think the settling is from the engine mount I believe its from the rubber vibration isolators that go between the engine and the mount.

  

 I had talked to Vans about forcing the engine mount into position on the Firewall and they suggested against it.  Having said that, typically in aircraft construction the mechanic is allowed to use whatever force he can generate by his bare hands only, no tools to get extra leverage.  Applying excessive force could reduce the life of the part.

  

 Niko

 40188 

  

 ---

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