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Maxspeedingrods H-beam rods, ARP 2000 bolts torqued to spec of conrod manufacturer using ARP lube (specifically instructed torque since ARP stretched figures would be too tight, and I do not have a stretch gauge), clearances were checked and crank journals were ground and measured and checked. However, I did not specifically measure the crank towards the sides compared to the middle, unsure if the machine shop did.
The only machine work done this time was on the crank. Backstory is that after ~80.000 miles past my original rebuild with the same setup I began to experience crankwalk - thrust bearing had worn through, and it took the crank thrust surface with it. I thought it was from me cranking the car with my foot on the clutch after installing a heavier pressure plate about 10.000 miles prior, so I just rebuilt the same setup with new bearings and a new crankshaft. I had the crankshaft ground and polished, double-checked measurements myself and installed it using new Glyco mains and Glyco sputter big-ends. It was a bottom-end-only rebuild.
So the only differences compared to the previous setup that was good for 80.000 miles, was a new crankshaft and Glyco bearings instead of OEM Volvo. The thrust-bearing wear can be explained from heavy clutch and failure to think of machining/polishing the crank thrust surface of the new crank.
However, I was shocked to see the state of these big-end bearings after only 2000 miles, so I was wondering if anyone recognizes the pattern. I will contact the shop, but until that time I'm curious as ever to know what causes this wear pattern.
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