no oil pressure

2003 DODGE RAM
70,000 MILES • V8 • 2WD • AUTOMATIC
Avatar
DODGEMAN082
  • MEMBER
  • 2 POSTS
Replaced heads on 4.7 and found lots of sludge on heads. Once completed and truck runs good but after it heats up the oil pressure drops off to 0. What could be the problem?
Jun 26, 2011 at 3:56 PM
Advertisement
Avatar
RASMATAZ
  • ✓ASE Certified Mechanic
  • 75,992 POSTS
  • ASE Certified Mechanic
If there's no type of knocking noise-check the oil pressure with a mechanical gauge to rule out the oil pressure gauge and oil pump, further could be clogged somewhere or engine bearings
Jun 26, 2011 at 5:02 PM
Avatar
JDL
  • ✓ASE Certified Mechanic
  • 16,098 POSTS
  • ASE Certified Mechanic
Use an analog gage inplace of oil pressure sending unit, just to double check oil pressure. Do you have good cylinder compression? If you remove oil fill cap on warm engine, any blowby? Does it use any oil?

Bearings--oil pump?
Jun 26, 2011 at 5:06 PM
Join 2CarPros for free, one of the most advanced car repair communities on the internet. From first-time drivers to seasoned mechanics, everyone is welcome to reply, share details, and get better answers. You can add a temporary image or video first; uploads are limited to 20 MB.
Ask a Free Question
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.