low oil pressure at idle

[Craig M]

Our dually with the 6.2 shows 40 psi or more oil pressure at startup. Once oil is warmed up, and vehicle at idle speed, pressure gauge reads about 8 psi. Goes back up tp 40 psi or so once you touch the accelerator. It does not take to much pressure on the accelerator to build the pressure back up, but 8 psi seems low. Worry about going down a long hill, with high rpms on the engine but low oil pressure. Any thoughts or comments?

[G. Gearloose]

Given your scenario, why would the oil pressure be low if the rpms are high on decel?

[84 Convert]

That sounds similar to what I had prior to doing a re-ring on the K30. I had one spun cam bearing, which I suspect was the culprit. On my engine, as long as the revs were up it seemed OK. Sitting at idle was where it really showed up.


Gregg

[Craig M]

It acts strange. When I first start the engine, the oil pressure is at 40 psi or so at idle. Once the engine is warmed up, at idle the pressure is 8 psi or so. The oil pressure goes up quickly when I depress the accelerator. I have not checked it recently coasting down hill. The engine speed may keep the pressure up. I was thinking that I needed to depress the accelerator but am probably wrong.

[HammerWerf]

Craig,
My '83 duallie was showing me the same indication. Very Low pressure at idle(close to zero), normal while driving. The original sender unit had been installed on the replacement engine. I replaced the sender, and the readings came back to normal. A secondary benefit with the new sender is the wrench point is on top. Got mine at Auto Zone.

HammerWerf