Crankshaft Rebuilding & Balancing

A crankshaft undergoing repairs by Rutt's Machine Shop Inc.

Crankshaft Rebuilding

All crankshafts are first cleaned and wet magnafluxed for cracks. All oil gallery plugs are removed. After than procedure, all cranks are inspected for straightness, journal sizes, thrust end play, and hardness. Crankshafts are then straightened if they are bent. Crankshafts are then polished or reground to factory OEM fillet radius specifications. After a crank is reground it is then final cleaned and oil plugs installed (when necessary) and bagged.

When welding a crankshaft journal, the journal is preground to remove electrolysis. All gears are removed, then it is welded in a submerge arc processor to build up the journal. The crankshaft is then placed in an oven to stress relieve the crank. After the crank cools, the shaft is then glass beaded or blasted to clean the impurities off the crankshaft. The crankshaft is then straightened again and as often as needed. After straightening, the journal is ground to factory specifications and inspected. Then the rest of the crankshaft is reground as needed. At Rutt's Machine Shop, Inc. , we do not guarantee any shaft against breakage, but our success rate is very high with few failures from regrinding or welding. We also weld many industrial shafts as well as crankshafts that need bearing or seal build ups.

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Crankshaft Balancing

At the customers request, crankshafts are checked for vibration by checking balance. Using a crankshaft balancer, the crank is checked for balance and corrected at the specified correction point by welding, adding heavy metal or by drilling to remove metal. Vibration dampeners, flywheels, flex plates are added to check the balance of them as well. By balancing an engine, the engine will run at optimum performance, less vibration and more longevity. We also balance any rotating shaft as well.

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