Mailing List flyrotary@lancaironline.net Message #53755
From: Jeff Whaley <jwhaley@datacast.com>
Subject: Replaced Tension Bolt, Oil Seal, Thrust Bearing ... back in the air.
Date: Wed, 9 Feb 2011 05:37:34 -0800
To: 'Rotary motors in aircraft' <flyrotary@lancaironline.net>

All the subject parts were replaced and the airplane was flown this past Sunday … post-flight inspection yesterday revealed no more oil leak – YEAH!!

The tension bolt most of you on the list already know about – replaced one tapered bolt with one heavier NEW bolt and re-torqued them all.

The rear oil seal was replaced because of a nagging oil leak for some time. My comment here is that the engine was originally a standard transmission, so I had to purchase a flex plate/ring gear and counter weight for an automatic, both of which were cleaned and painted prior to installation.  The counter weight has a very small contact surface with the rear oil seal as seen by about 1/8 of paint worn-off, so I wonder if that slight amount of surface wear and possibly assembling the seal and counter weight DRY may have contributed to the leak.  I can’t remember whether they were oiled prior to first assembly or not – so I definitely oiled both this time around and polished a larger area on the counter weight with emery cloth.

The thrust bearing (front planet) was entirely my fault.  It must have slipped out of alignment during re-assembly of the PSRU and got pinched between the housing and planet carrier … anyway a bad sounding POP was heard as the PSRU attach bolts were being tightened up … a new one with lots of grease replaced the broken one.

Jeff

(Looking forward to oil-streak free flying)



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