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2002 Jeep Cherokee Spun Rod Bearing

Tiny
BILLY1014
  • MEMBER
  • 2002 JEEP CHEROKEE
  • 4.7L
  • V8
  • 4WD
  • AUTOMATIC
  • 163,000 MILES
2002 4.7L Jeep Grand Cherokee Limited. Rod knock. Checked the rod caps. One was discolored and I popped it off to find a spun bearing. The crankshaft seems to be fine. I want to try and replace the bearing shells. Should I replace just the one or all of them? And should I pop the rest of the caps off for inspection? 
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Wednesday, April 9th, 2014 AT 9:22 AM

3 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,724 POSTS
I would replace all of them while I have access. As far as just replacing the bearings and not the crank, you really should plastigage them to make sure they are within tolerance.
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Wednesday, April 9th, 2014 AT 9:52 AM
Tiny
BILLY1014
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  • 2 POSTS
So you don't think replacing all them with new bearings will throw off the engine balance or something? I'll see if my friend has a plastiguage to borrow.
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Wednesday, April 9th, 2014 AT 10:17 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,724 POSTS
Replacing all the rod bearing won't hurt anything. However, you need to make sure the crank isn't undersized which will cause you to spin one of the new bearings.
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Thursday, April 10th, 2014 AT 5:25 AM

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