TwinTurbo.NET: Nissan 300ZX forum - Re: Interesting rod bearing wear pattern.....
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Subject Re: Interesting rod bearing wear pattern.....
     
Posted by morepower2 on June 29, 2004 at 3:29 PM
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In Reply To Interesting rod bearing wear pattern..... posted by Ash's Z (In Progress) on June 29, 2004 at 02:37 PM
     
Message Its hard to see the bearing surface because the pictures are blurry but their could be some smearing of the bearing material and what looks like some pitting on one of the bearings. Pitting, smearing and material tranfers are signs of bearing overload. Like I said the picture quality is poor so I can't be certain but it could be transient high loadings cause by detonation.

Then again it could be just heavy wear due to oiling issues, what was your oil pressure hot idling? 5000 rpm under load?

Crank whip and harmonic issues usualy look like uneven wear accross the main bearing first, like wear on the edges of the bearing. If you ever seen an abused overreved I-6 engine you will know what I mean.

Detonation is the biggest killer of VG rod bearings.

Mike

     
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