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No oil pressure

Tiny
DODGEMAN082
  • MEMBER
  • 2003 DODGE RAM
  • V8
  • 2WD
  • AUTOMATIC
  • 70,000 MILES
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?
Sunday, June 26th, 2011 AT 3:56 PM

2 Replies

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 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
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Sunday, June 26th, 2011 AT 5:02 PM
Tiny
JDL
  • 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?
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Sunday, June 26th, 2011 AT 5:06 PM

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