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Subject: Re: [FlyRotary] Re: For Lynn....Freshening 13B Side Housings
Date: Thu, 07 Jun 2007 18:15:05 -0400
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George,
  You certainly could. IF you can find someone that does nitriding=20
nearby. (that's the hard part) In central California heat treaters and=20
chemical processing is going away fast. It used to be easy, darn it.
Bill Jepson


-----Original Message-----
From: George Lendich <lendich@optusnet.com.au>
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Sent: Thu, 7 Jun 2007 2:57 pm
Subject: [FlyRotary] Re: For Lynn....Freshening 13B Side Housings


I use old fashioned pad cement to glue on 240 wet or dry silicone=20
carbide paper. It acts like a thick contact cement. Just back and forth=20
stripes quickly and clamp in the paper and give it a twist to spread=20
the glue around, than lift an edge and blow on the glue to get it=20
curing, then push the paper back on. Nothing else will touch the=20
Nitride surface.=A0 I run it flat only, and flooded with kerosene or=20
number 2 diesel. Just to keep the paper clean and cutting well. The=20
idea is to add thousands of oil holding circles.

=A0

Make no attempt to reduce the material along side the wear mark in th=20
middle of the combustion side, where the sides seals wear off the most=20
material. Wear over .006" should

indicate a regrind and or lap job. Engines will run perfectly well with=20
more wear but start to use oil and loose compression.

=A0

Just use the same time and pressure everywhere, and all will be well.=20
Use a propane torch on the abrasive face to release the pad glue. This=20
was standard operating procedure in body shops around for years. Now=20
the hook and loop stuff and pre-glued pads are taking over. But nobody=20
makes silicone carbide in hook and loop (yet).

=A0

Make sure the DA is set on orbital instead of grind. The DA in this=20
case means Dual Action.

I didn't know that for years and used one every day. I thought it was a=20
brand name.

=A0

Lynn E. Hanover

=A0

Lynn,

Having looked at that wear area on the end housings, I was wondering if=20
this was in excess, could we have the surface ground and then=20
re-Nitrited?

The whole process wouldn't be anywhere near as expensive as new housings

George (down under)


------------------------------------------------------------
See what's free at AOL.com.


=A0

Make no attempt to reduce the material along side the wear mark in th=20
middle of the combustion side, where the sides seals wear off the most=20
material. Wear over .006" should

indicate a regrind and or lap job. Engines will run perfectly well with=20
more wear but start to use oil and loose compression.

=A0

Just use the same time and pressure everywhere, and all will be well.=20
Use a propane torch on the abrasive face to release the pad glue. This=20
was standard operating procedure in body shops around for years. Now=20
the hook and loop stuff and pre-glued pads are taking over. But nobody=20
makes silicone carbide in hook and loop (yet).

=A0

Make sure the DA is set on orbital instead of grind. The DA in this=20
case means Dual Action.

I didn't know that for years and used one every day. I thought it was a=20
brand name.

=A0

Lynn E. Hanover

=A0

Lynn,

Having looked at that wear area on the end housings, I was wondering if=20
this was in excess, could we have the surface ground and then=20
re-Nitrited?

The whole process wouldn't be anywhere near as expensive as new housings

George (down under)


------------------------------------------------------------
See what's free at AOL.com.


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