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1992 Jeep Wrangler Oil Pressure

Tiny
MONTYLANT
  • MEMBER
  • 1992 JEEP WRANGLER
  • 4 CYL
  • 4WD
  • MANUAL
  • 100,000 MILES
This Jeep lost oil pressure, and in taking it apart, the oil pump drive was broken where it connects to the shaft that drives the oil pump. The oil pump had not seized, neither was there any evidence of wear (scarring, color change). The oil pickup screen was clear. This engine was reportedly rebuilt about 2 years ago. I replaced the oil pump, main bearings and rod bearings and I still have low oil pressure. (When the engine is cold the max is 30 psi and as it warms the pressure drops close to zero at idle.) Any ideas?
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Thursday, October 30th, 2008 AT 10:01 PM

3 Replies

Tiny
JAMES W.
  • MECHANIC
  • 2,395 POSTS
Did you plastigauge or somehow check your bearing clearances?
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Thursday, October 30th, 2008 AT 10:11 PM
Tiny
MONTYLANT
  • MEMBER
  • 3 POSTS
No. I used standard bearings, and the old main bearings looked like they didn't need to be replaced. The engine was tight after the repair, the crank was very hard to turn.
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Thursday, October 30th, 2008 AT 10:24 PM
Tiny
JAMES W.
  • MECHANIC
  • 2,395 POSTS
Was your oil pressure low when you first started the motor? If the crank was "real" hard to turn on assembly, that is not a good sign. That's why they use plasti-gauge so you know what your clearances are for sure.
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Friday, October 31st, 2008 AT 8:08 PM

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