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Hi, Mark.....possibly our engines are
different. The existing press-fit hole in my engine was already 17mm, or
.690 inches. The required drill for a 3/8 NPT is 37/64ths, or
.570. The .690 hole is already bigger than the required .570 tap
drill size for a 3/8 NPT tap. My engine is a 1989 turbo model. Hope this
is useful to someone? Paul Conner
----- Original Message -----
Sent: Tuesday, January 13, 2004 7:34
AM
Subject: [FlyRotary] Re: Success
Paul,
I was able to tap mine to 3/8 NPT which left adequate
wall thickness.
Mark S.
At 09:54 AM 1/12/2004 -0500,
you wrote:
Hi,
Finn....By the time I drilled and tapped the hole for 1/2 NPT, the remaining
wall would be so thin, I was afraid it would break during the tapping
operation. The housing is cast iron, and a pipe tap is tapered, so it
tries to expand the hole while tapping. Not a good situation when you have
thin walls, expecially if those thin walls are cast iron. Take care.
Paul Conner
- ----- Original Message -----
- From: Finn Lassen
- To: Rotary motors in
aircraft
- Sent: Sunday, January 11, 2004 11:11 PM
- Subject: [FlyRotary] Re: Success
- I curious as to why you didn't simply thread the housing with 1/2" NPT
and used the fitting unaltered.
- Finn
- sqpilot@earthlink wrote:
- The second item I had success with was the
5/8" heater nipple that is a press fit into the engine, underneath the
oil filter. Mine was missing from my engine. I tried to find a new
one, with no success. Finally, Mazdatrix sent a used one, but when I put
a micrometer to it, it was considerably out of round (probably caused
during removal from the casting).
-
- I found at our local CarQuest
auto parts store, a steel 5/8" hose barb to a 1/2" NPT male fitting. I
just put it in a lathe, and turned the 1/2" NPT threaded area down to 17
mm, or .160 inches. In the picture, you will see the longer original
piece, as well as the new, slightly shorter
nipple.
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