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Re: [Healeys] No oil pressure--conclusion

To: Austin Healey <healeys@autox.team.net>
Subject: Re: [Healeys] No oil pressure--conclusion
From: Austin Healeys List <austinhealeyslist@gmail.com>
Date: Wed, 7 Dec 2016 10:55:22 +1300
Delivered-to: mharc@autox.team.net
Delivered-to: healeys@autox.team.net
References: <CAPTa0B7n-55zkE7Z9tqSnjrNjYmZGCsVR8umyJaXy465jtbUog@mail.gmail.com> <1521238497.661311.1481046954471@mail.yahoo.com>
Hi Michael,

It isn't bad filter design, it is a product of good design!

When the pump is a bit tired and has air in it, it can't make enough
pressure to overcome the filter's anti-drainback valve flap so will
not pump oil until you unwind it a fraction to release the air. Once
primed it will stay primed until next filter change.

There are a lot of filters out there with non-functioning drainback
valves, including some KnN designs. Looks like you found a good one.


On 12/7/16, Michael MacLean <rrengineer.mike@att.net> wrote:
> Seems to me the difference in all this is the oil filter.  Bad filter?  If
> you have normal oil pressure now the clearances are more than likely OK.
> The proof would be if an oil change next time yields the same results.  Not
> likely two bad filters in a row.  Clogged pickup screen? My 2 cents, not
> worth much, but you get it anyway.Mike MacLean
>     On Tuesday, December 6, 2016 8:49 AM, Michael Oritt
> <michael.oritt@gmail.com> wrote:
>  Just now I pulled off the K&N, removed the spark plugs and spun the motor
> over. After about 15-20 seconds of cranking I could see a good stream of oil
> coming out of the port in the oil filter adapter and the needle came of the
> peg. I put a new filter on, reinstalled the plugs and VOILA--oil pressure!
> Collective wisdom is that with an engine that has some miles on it no damage
> should have been done to bearing surfaces, rings and bores, etc. during the
> minute or so of running without oil pressure yesterday and I certainly hope
> that will be borne out in real life.
> As I said in an earlier post I have heard of oil pumps losing prime when
> they have sat for a while without oil in them. However no more than 30
> minutes elapsed between the time I drained the oil and went to restart
> yesterday and I am quite surprised by the oil pump's inability to reprime
> itself. I have probably changed the oil and filter in the same manner 10-15
> times over the years and while there is always a first time for everything I
> believe the message is that the lower end of the engine and pump need to be
> closely inspected for clearances and new parts installed as necessary.
> I performed the oil/filter change yesterday because in about ten days my
> wife and I plan on taking a trip down to the North Carolina Outer Banks and
> then on to Wilmington NC to celebrate our second anniversary. So I'll hope
> for a successful and uneventful trip and for sure the car will be up on
> stands immediately upon my return.
> Thanks to all of you for the good advice and patience. This list continues
> to be a great resource!
> Best--Michael Oritt
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