Rod Bearing Defects

As I was taking all of my detailed measurements, I discovered that the rod bearings, which are Brazilian made, contained two manufacturing defects. The first defect was a bearing that was "crooked" and didn't sit in the rod cap saddle properly:

Defective rod bearing for a Porsche 914 engine

 

The second defect was a bearing that was too long - one side of it rose above one mating surface:

Defective rod bearing for a Porsche 914 engine

 

When this cap was bolted to the rod, the visible gap shows how much space there is after the bearing makes contact with its other half:

Defective rod bearing for a Porsche 914 engine

 

And, once the rod bolts are torqued down, it causes bearing distortion that can easily be measured. The following two pictures show the diameter inside the bearing (at locations 90 degrees from each other) as measured with a caliper - NOT the most precise way to measure internal bores - but the 0.006" difference clearly isn't acceptable.

Measuring defective rod bearing for a Porsche 914 engine

Measuring defective rod bearing for a Porsche 914 engine

 

I have a new set of higher quality "German" bearings on order which, hopefully, will prove to be more precise.

Previous    Next

 
All pictures and text copyright 2008