Mailing List flyrotary@lancaironline.net Message #66744
From: Matt Boiteau mattboiteau@gmail.com <flyrotary@lancaironline.net>
Subject: Re: [FlyRotary] Re: PSRU thrust bearing/washer
Date: Wed, 28 Apr 2021 16:13:05 -0400
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
The end play was good. Metal ruler across and could just see daylight across.

Neil's uses a rubber oring, so we test endplay without it. Then adding the oring will add the nessessary clearance in end play.

The one Neil supplied was either nylon or Teflon flat washer and it melted, so removed it. So talking with him, switched it out to the oil embedded one. Again, just a flat washer.

Anyone have more details what Tracey used? Like a spring washer made out of nylon?





On Wed., Apr. 28, 2021, 14:16 Finn Lassen finn.lassen@verizon.net, <flyrotary@lancaironline.net> wrote:
Too little or too much end play?

Tracy specifies 0.005 to 0.035"

Note that if you check it without RTV, it may increase when you assemble it.

Finn

On 4/28/2021 1:05 PM, Matt Boiteau mattboiteau@gmail.com wrote:
I have one of Neil's 3.17 psru with Tracey's cushion drive. *I also sent Neil an email but it's late in the night in Australia.

After my fly off hours, tearing down the plane to inspect everything. The Ultra-Low-Friction Oil-Embedded Thrust Bearing is broken into pieces. 
https://wwwmcmaster.com/7421K28/

The nylon or teflon washer supplied just melted. I thought I nailed it with a fix using the oil-embedded, but I guess not.

I think in Tracey's documentation, he called it a snubber ? Any ideas what I can use, or why this happens?
- Matt Boiteau


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