>From dave Tue Mar 17 20:13:28 1992
To: uunet!OREGON.UOREGON.EDU!DWILSON
Subject: Re: oil coolers and thermostates
Status: R
>I've got a B GT with oil cooler.
>After the car has sat for over ca 5 days the oil pressure takes over 10 seconds
>to reach max (it tkes less if the car has sat for 1 day and only a second if it
>has just been run) after it has started. I think this is because the oil
>drain
>s out of the cooler to the sump so the oil pump must fill the cooler before the
>system reaches full pressure. So when should I measure oil level??
>Also is there some valve to prevent oil flowing back to the sump? If so where?
There is indeed a check valve. It is in the oil filter mount
on the side of the engine. You didn't say what type of oil filter you
had, but I would guess that it is one of the "upside down" spin on
types. These incorporate check valves in both the inflow and outflow
side. The idea being to keep the oil from draining out of the filter.
10 seconds is about the right amount of time to charge the
filter if it's empty. If you were filling the entire oil cooler, I can
assure you it will take far longer than 10 seconds.
I would examine the inflow check valve and make sure it's not
stuck slightly open. These are usually ball and spring affairs, but I
havn't dismantled the inverted spin-on type to see.
A cautionary tale: If anyone has a 68 or 69 MGB with the
inverted cartridge filter, REPLACE IT WITH THE LATER (or earlier) UNIT
NOW. These things habitually take 10 seconds to get oil to the engine
after a 10 minutes of idleness. It tears the sh*t out of bearing
surfaces inside the engine.
Dave Ambrose
in need of a good brew right about now.
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