Hi All,
To contribute to the confusion, I decided to replace my original oil feed flex
tube with a new one I had purchased a while ago from Victoria British. As
with most replacements, this unit was far less substantial and I was tempted
to reinstall the 47-year old original. When extracting the original, I
inadvertently de-installed the adapter fitting attached to the engine and
noted the very small orifice through which the oil would flow. Based upon
this very small passage, I am lead to think that this orifice is the mechanism
that the engineers intended to buffer out the pulsations to secure a steady
gauge reading. Should this be the case, air must be bled from the tube going
to the pressure gauge for a true reading.
When starting the engine prior to bleed the air from the tube, the gauge gave
a stead reading of 20 lbs @ about 2500 RPMs using 20W50 cold. After bleeding
the air, the gauge read 60 lbs @ about 2500 RPMs with an almost unperceivable
needle vibration that I expect will probably disappear after a full run
(possibly a very slight amount of air past the coupling and within the
gauge).
Ray (64BJ8P1)
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