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1988 911 Carrera Intermediate Shaft Wear

Engine

Vehicle Information: Model: Carrera; Year: 1988; Body Type: Coupe; Engine (type, size, modifications): 3.2 liter; Total Mileage: 140,000;

I am in the process of rebuilding the 3.2L engine in my 1988 Carrera due to age and other indictors. As expected the valve guides and oil rings were failing however, many of the components were remarkably clean with little indication of wear. The Rod & Main Bearings retained 60%or > of there original material thickness and all Head & Case Studs were secure. The one area which showed excessive signs of wear were the Bearings supporting the Intermediate Shaft, these were worn down to the copper shell. Inspection of the Timing Chain tensioners, Chain & Ramps did not reflect excessive wear patterns nor were there any indications of these items having been previously repalced. I have reviewed the process outlined in the Factory Shop Manuals for the installation of the Intermediate Shaft which measures the lateral runout along the shaft connecting the Oil Pump & Intermediate Shaft. Can you provide any insight into the excessive wear found on these bearings?

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