Truing APC Props and drilling prop hubs?

[Ihncheol Park]

Bob,
there was short discussion about drilling the prop hub for larger OD through
prop nut.
I also have similar situation.  People used step drill on drill press.
Place the prop accurately on the bed, clamp it, drill through slowly.
No other methods that I know of.

Just curious, why are you using 813-A?  It is shown as short shaft double
jam nut.  I don't know if there is any applications that needs of short
shaft nuts.
I asked this list a while ago regarding the Tru Turn prop nut 814 and 813
because Tru Turn website shows 813-A for 140s.  Almost everyone who
responsed were using 814A. Still using the 814A because I have a few of
those for all YS 4-strokes, 63, 91, 120 140s all have same thread.

Ihncheol Park
  -----Original Message-----
  From: discussion-request at nsrca.org [mailto:discussion-request at nsrca.org]On
Behalf Of rwantz2 at comcast.net
  Sent: Sunday, July 06, 2003 5:10 PM
  To: discussion at nsrca.org
  Subject: Truing APC Props and drilling prop hubs?


  Mounted a new prop last night - APC 16.5-12W, and when I screwed it onto
the crankshaft, I noticed it wasn't turning true.  Upon inspection, I
discovered that the hole in the hub was not centered.  It looked ok from the
drive washer side but the front of the hub was off by a good 1/16".
Obviously this prop wouldn't track true.
  I always ASSUMED these were molded in and were pretty accurate, so never
checked them.
  I opened up the front of the hub a little, without touching the rear, and
let the thrust washer true up the prop.  How do most of you true props?

  Also, I just got the Tru-turn TT-813-A double jam nut spinner adapter for
YS 140 engines.  I always used the standard 814 double jam nut in the past,
but the 813 requires a 1/2" hole be drilled into the front of the prop hub
(at least part way).  What's the best way to do this?

  Thanks,
  Bob
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