bad sending unit, I have 45psi at 2000rpm. I
dodged another bullet.
Thanks for the advise Greg
Rick
----- Original Message -----
From: "Greg Smith" <mr_beachcomber@email.msn.com>
To: "'rick'" <mudfly@nycap.rr.com>; <autox@autox.team.net>
Sent: Sunday, July 22, 2001 11:30 AM
Subject: RE: looking for mr goodwrench
> > My 1986 GMC Van 4.3L V-6 161,000 miles(The one I usually haul
> > my kart in)has suddenly lost about 25# of oil pressure.reads
> > "0" at idle and just above 10 psi at highway speed. Oil
> > wasn't low, No noises, no lifter clatter, engine temp is
> > normal, I'm going to do a pressure check to check the oil
> > pressure sending unit. A couple places I went looking for
> > info, mentioned cleaning the oil pickup screen, I'm wondering
> > if I can hit the pickup screen with carb cleaner from the
> > drain hole? I just changed oil a week ago, Is it possible
> > something could be up with the filter?? Any other ideas??
>
> Rick,
>
> If your filter were clogged up, the by-pass valve in the oil filter
> adapter would allow oil to by-pass filter and go to oil galleries. This
> isn't the case because your oil pressure is too low. Although you might
> be able to hit the pick-up screen from the oil drain hole, whatever
> clogged it up would still be in the pan ready to clog it up again.
>
> Possible causes: Best case - oil pressure sender is shot. Worse cases
> - oil pick-up tube & screen separated from the pump; blockage of pick-up
> screen (cannot be cleared w/o dropping the oil pan; oil pump pressure
> by-pass spring stuck open; or oil pump gears worn out and sheared off
> inside the pump (rare, gears normally still provide 20 psi when worn
> out); or pick-up screen fell off and sucked up debris now partially
> blocking oiling passage.
>
> Don't drive your van anymore!!! If your oil pressure is that low that
> you may have already wiped all your bearings. I wouldn't even chance
> checking the oil pressure sending unit on your van. Remove it and test
> it on another vehicle. If it's good, your engine needs to be
> disassembled and inspected/rebuilt.
>
> Greg Smith
> '89 BSP Corvette
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