REFLECTOR:Mag Timing Slipped?

Mon, 9 Feb 2004 08:25:16 -0500

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I am doing my first condition inspection on my 173 Elite RG and all is =
looking great except:

When I checked my Slick mag timing, I found it at 32 degrees BTDC.  =
Since our Cessna 172 in 10 years never had the timing reset except for =
the 500 hour mandatory inspections of the Bendix dual mag, this has me =
scratching my head.  The timing on the Jeff Rose has not changed.

The retaining bolts were tight, an internal inspection of the mag =
reveals nothing (however, I have not checked the internal timing yet) , =
and I KNOW the timing was set correctly (25 degrees BTDC) on this =
Lycoming IO360.  I had a low static RPM - 2100 rpms - so we checked =
everything before changing the prop.  Any worn parts in the gearing =
would cause the timing to be more retarded.

Is it reasonable to think that the points could wear enough to cause the =
timing to move that much?

Or any other ideas?

THANKS
Ronnie Brown

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<DIV><FONT size=3D2>
<DIV>I am doing my first condition inspection on my 173 Elite RG and all =
is=20
looking great except:</DIV>
<DIV>&nbsp;</DIV>
<DIV>When I checked my Slick mag timing, I found it at 32 degrees =
BTDC.&nbsp;=20
Since our Cessna 172 in 10 years never had the timing reset except for=20
the&nbsp;500 hour mandatory inspections of the Bendix dual mag, this has =
me=20
scratching my head.&nbsp; The timing on the Jeff Rose has not =
changed.</DIV>
<DIV>&nbsp;</DIV>
<DIV>The retaining bolts were tight, an internal inspection of the mag =
reveals=20
nothing (however, I have not checked the internal timing yet) , and I =
KNOW the=20
timing was set correctly (25 degrees BTDC) on&nbsp;this Lycoming =
IO360.&nbsp; I=20
had a low static RPM - 2100 rpms - so we checked everything before =
changing the=20
prop.&nbsp; Any worn parts in the gearing would cause the timing to be =
more=20
retarded.</DIV>
<DIV>&nbsp;</DIV>
<DIV>Is it reasonable to think that the points could wear enough&nbsp;to =
cause=20
the timing to move that&nbsp;much?</DIV>
<DIV>&nbsp;</DIV>
<DIV>Or any other ideas?</DIV>
<DIV>&nbsp;</DIV>
<DIV>THANKS</DIV>
<DIV>Ronnie Brown</DIV></FONT></DIV></BODY></HTML>

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