no oil pressure

2003 DODGE RAM
70,000 MILES • V8 • 2WD • AUTOMATIC
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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 8:56 AM
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RASMATAZ
  • ✓Experienced Mechanic
  • 75,988 POSTS
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 10:02 AM
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JDL
  • ✓Experienced Mechanic
  • 16,098 POSTS
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 10:06 AM
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