An answer to Gregs question:
I only put a few thousand miles on the car a year, if that. But, those are
hard miles including
autocrossing. I am pretty sure the pressure really isnt zero, becuase it
would have blown up by now. I should just swap out the ancient gauge and
sender with a new autometer gauge or similer
and good sender and have that good safe feeling back, but the truth is that
it dosnt bother me.
Previous threads from years back have talked about this being a common
problem, and although the pressure does get low at hot idle, that is normal,
and a lot of the problem is with the gauge and sender not being accurate.
Hope this helps.
Jim
Chesapeake Virginia
>From: sportstergreg@everestkc.net
>To: Jim InVirginia <nqrithfordatsun@msn.com>, wilhouse@charter.net,
>datsun-roadsters@autox.team.net
>Subject: Re: Oil Pressure
>Date: Tue, 06 Sep 2005 16:48:18 -0500
>
>From my experience, I wouldn't trust that having oil in the head as
>guaranteeing that the oil pump is good. I have a sportster engine in
>pieces in my garage that the mechanic (who used to work on it) swears the
>oil pump is good because oil was splattering out with the rocker boxes
>removed. The engine has a massive amount of oil pump failure damage, the
>pump itself is visible worn, out of spec and does not rotate smoothly.
>Maybe Roadsters are different but I wouldn't chance it.
>
>If you have doubts, I would look for simple things first, like a stuck
>check valve (if Roadsters have those), a bad sending unit, a bad oil filter
>(sometimes the by pass valve fails I'm told.), incorrect oil weight, low
>oil level before moving to more difficult checks like physically pulling
>the pump or checking for a clogged pickup (assuming Roadsters have those).
>
>On the oil pressure at idle, I do have a question for Jim. How many miles
>have you run it with the pressure dropping to zero when hot? I ask because
>I had the same problem in hot weather. For really hot weather, over 90, I
>switch to straight 60 weight. That has kept some pressure at idle, but
>still not as much as I would like. Of course, with one oil failure engine
>in my garage, I'm a little nervous. :-)
>
>Hope this helps.
>
>Greg
>69 2000
>Overland Park, KS
>
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