New Cast Iron Oil Pump pressure low

[alamow]

(03-27-2021 )Tanker93 Wrote:  

(12-13-2020 )alamow Wrote:  Mandy, thanks so much for posting. Information like this is gold dust. Much appreciated.

Cummins put my truck on the dyno. 520hp at the wheels. 35psi at rated HP. So I have an operational engine brake at 2050rpm..... within spec according to Cummins.

I'll try 5mm shim when the Xmas rush stops.

Did you get a chance to shim it? We're in the same area and I noticed lower pressure on a couple of our crate engines and a recently rebuilt engine. Was in Hedland this week and saw the pressure on the rebuilt engine go down to 105kpa at idle when oil temp was around 110 degrees, comes back up to a more acceptable level once oil cools down a bit though

No. The pipe to the exhaust pressure sensor was blocked with soot resulting in high water and oil temp. Once the blockage was removed the oil pressure stabilized at 32-34psi regardless of the oil temp. The engine runs much cooler and recovers from a hard pull so much quicker. From water temp of 100c to 87c takes 200m rolling off a hill. This has the added benefit of a cool engine when pulling up. Previously high idle and Horton was required to increase oil pressure from 15psi to 18 psi at idle.

More recently the pressure differential sensor was found to be leaking at the front O ring. This caused all sorts of EGR/VGT issues at idle.