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4.6 Rods installed backwards

6256 Views 35 Replies 12 Participants Last post by  KEVIN$
Hey all. Had my shortblock forged a year ago and been driving it for that long too. Well last weekend I heard a knocking sound. Heard it was coming from the motor and dropped the next day. I never lost oil pressure, motor was primed before first start, new oil pump was installed, always full on oil and changed regularly. Well this is what I found. Cylinders 1 and 5’s connecting rods are installed backwards and the bearings are riding on the crank fillets. The bearing on cylinder 1’s connecting rod wasn’t installed properly either. Monday can’t get here quick enough.

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It’s amazing, and I can’t fathom why, it lasted this long. Like...I’m surprised it made it to the end of the driveway! Basically the parts melded to one another and that apparently worked this long. Might as well name the builder now because I’d bet money you don’t receive any satisfaction. Warranty is long gone and he’ll claim somebody else must have worked on the engine.
A feeler gauge to measure rod side clearance is all that was needed to indicate there might be a problem....Machine shop bullshi*ed their way thru this. I know...old thread...
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