OK the deal is I have an 89 f350 7.3 diesel. Love this truck first diesel and never going back to gas. The issue iam having is the truck just recently started to have low oil pressure after it is warmed up at idle. We talking idiot lite on and my oil pressure gauge at the minimum. But only at idle. If i give it a little gas the pressure comes back up.From talking to a few mechancs there saying that its probly bearing wear. AHHHH. I was hoping i could get away with changing the oil pump but I iam still green with this engine any advice is very welcome. Thxs
Replace your sending unit before you do any major repairs.
Paul - Pocono Mtns. USA
02 E350 15 Passenger Cream Puff, 72,000 Miles, 5.4L Gasser
'90 E350 7.3L Ex-Ambulance High Top 420K Miles, No Turbo, Stock Stock stock, No ELC! (Extended Life Coolant) & 10 Oz. Bars Stop Leak. 10 wonderful cool years using Freeze12 without any AC system modifications. Retired 11/8/2011 with blown trans.
after the sending unit and mechanical gauge, it is probably the oil pressure relief valve in the oil cooler. pull off the oil cooler and see if its stuck open. even a little will have a drastic effect on oil pressure. the way i look at it is
new oil pump and bearings (rod and mains)= alot of money'
oil cooler header= 264 (if i remember corrrectly)
check that before doing bearings and save yourself some money becuase unless its knocking it probably isnt your bearings.
or you could do what i did and replace everything while your in there
ASE Certified: Medium and Heavy Truck Diesel
Federally certified air brake technician
1990 F-250 7.3 IDI N/A 4x4 ZF5 Dana 60 front, LUK Clutch SMF, 215k