Hi Lew,
no response (at least through the list) concerning your mystery
with the plug on the oil return-pipe.
I too have no idea what for it is.
1. The most obvious reason could be that someone
needed a oil-return to the sump, but at that level,
it only could be from a leaking vertical-drive.
2. Someone could have used this fitting for a pressure-less
oil-supply for a supercharger. Perhaps with the same
system which is used when you withdraw rain-water
from a rain-pipe at the corner of the house.
3. Unlikely is the idea that someone used that fitting,
to fix a temperature-feeler for measuring the temperature
of the oil leaving the cyl.-head.
4. The reason why just this pipe is chromed, could be
that once it came from another P-engine whose owner
liked chroming on all pipes.
I know my thoughts can't solve your mystery, but every little helps.
Regards, Gerhard
+++++++++++++++++++++++++++++++++++++++++++++++++++++++
-----Original Message-----
From: owner-mg-mmm@autox.team.net [mailto:owner-mg-mmm@autox.team.net]On
Behalf Of Lew Palmer
Sent: Tuesday, January 21, 2003 4:00 AM
To: MMM List
Subject: Oil Retuen pipe
On my PB Airline, I have discovered an oil pipe that has me curious. It
is the middle drain pipe from the head to the crankcase. Near the top
end of this pipe there is a VERY neatly (like factory built) brazed-in
< BSP male fitting with a matching male plugged nipple and nut
obviously to seal off this fitting. The plug is cross-drilled and fitted
with a split-pin. The whole pipe is chromed, but looks very original. I
can find no picture or reference to such a pipe in the 1999 Yearbook
article on oil pipes nor in the workshop manual.
This raises a few questions:
1) Why would the pipe be so equipped?
2) Is there any significance to the chrome plating (like being a
workshop or factory accessory for testing)?
3) If this were on a supply pipe, I could understand that it might
be for a supplemental pressure gauge or supply line to an accessory like
a supercharger, but this is on a return pipe. Any idea on its purpose?
Just another of lifes MMMysteries.
Regards,
Lew Palmer
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