Jun/Jul 2008

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Digging Through History: Rust, Mud and Sludge

By John Rothfuss

1840 Porter Road, White Lake, Michigan 48383

The Delco light plant had seen many years of useful service. The engine's valiant attempts to maintain a constant speed had worn the throttle shaft by nearly a third of its original diameter. The light plant revealed more of its past as I slowly disassembled this faithful servant to attempt its resurrection. Though it had charged its bank of batteries many times through many years, the engine had not been neglected. As oil consumption increased the crankcase was topped up regularly. Quite possibly the owner changed the oil faithfully until near the end as there was no heavy sludge buildup in the crankcase. The valve rockers had been generously oiled at frequent intervals. So much so that excess oil ran down the valve stems and springs onto the head where it slowly carbonized, undoubtedly impart...

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