Join Date: Dec 2004
Location: Williston North Dakota
Feedback Score: 0 reviews
Cat 3406E Low oil Pressure
At work we have a 3406E with low oil pressure only when engine is warm. They had the oil pump replaced, and that fixed the problem for 2 months/7000 mi.
We tore the oil filter housing off and inspected the cooler and filter bypass valves, they are OK. We also dropped the pan and inspected for damaged inlet or discharge lines and o-rings from the pump and replaced mains and rods because of mileage on truck, all are OK.
Has anybody else ever come across a problem like this or does anybody know of any other part that could cause this problem?
On Edit: Engine cold has 55-60 psi throughout RPMs, when hot, drops to 40-42psi throughout RPMs. This truck just started doing this before replacing oil pump.
Former Ford Diesel Tech
ASE Certified Parts Counterperson, Automotive, Medium, & Heavy Truck Technician
1999 F250 XLT 4x4, Red, 7.3 6spd AWA5, 3.73LS rear, CCV Mod, APC Headlamps, Autometer C2 Gauges, (Boost,Pyro,Trans), 4" Turbo-back exhaust, XM Radio, AIS, ITP Regulated return, fuel feed lines, Airdog, & 4pos. chip.
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2001 Ford Escort ZX2 - Black- 4cyl 2.0DOHC, 5spd.
1999 F350 4x4 XLT, CC/LB PSD, 6spd, Aluminum service bed, York Compressor Onboard air, CCV, Custom Intake & Exhaust, Strobes and a few other goodies
RIP Steph F. & Trista J., 4/27/07, you will be missed by many.