Dave, Years ago I had the same thing happen to my '67 BJ8. I was driving in
traffic and all of a sudden my oil pressure gauge started to vibrate and the
needle oscillated very rapidly and I noticed a drop of oil on my left pant
leg. I looked at the back of the gauge and saw a drop of oil hanging on the
nut that attached the direct reading oil line to the back of the gauge. I
tightened the nut and it did not help. I am the original owner and know the
oil pressure line had never been disconnected and guessed there must have been
a column of air in the line that was lost due to the loose nut at the back of
the gauge. I took the line loose at the engine and gauge and blew out the
line and reconnected both ends and the problem cleared up and has never
reoccurred since and that was back in '69 or '70. There is a small pin hole
in the fitting to the back of the oil pressure gauge that dampens the pressure
entering the gauge and I'm guessing the hole can't dampen the oil pump pulses
with a column of oil at the back of the gauge. The column of air compresses
more easily than the oil does and is dampened by the pin hole. Hope this
helps.
Larry
'67 BJ8
-----Original Message-----
From: David Masucci <drmasucci@comcast.net>
To: healeys@autox.team.net
Sent: Thu, Aug 5, 2010 7:51 pm
Subject: [Healeys] oscillatiing/chattering oil pressure gauge
My BJ8 has always had typical oil pressure and still does. The engine runs
great and makes no bad noises. But all of a sudden the oil gauge is
oscillating a lot! It will chatter over a 20-30 pound range when the engine is
at 2500 RPM or so. Even at idle it's chattering back and forth. I've seen
similar things before when there's air in the oil line, but this is a lot
worse.
The engine seems fine...I hope. What could do this? Can the relief valve do
this?
Thanks,
Dave
BJ8
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