Wood's Powr-Grip Valve Grinder

The Wood's Powr-Grip Valve Grinder provides a positive system for holding valves during checking and lapping operations. The Spring-loaded vacuum pump, built into the handle, provides vacuum reserve for long-lasting hold, and serves as a leakage indicator to lessen unexpected release. A single stroke attaches the cup firmly. The spring is balanced so the plunger will return only part of the way if the cup has sealed properly. Further movement indicates leakage and the need to either dampen the cup face slightly for a better seal, or reclean the valve head.

Construction and design assures long service. The cups are molded from tough, durable tread rubber, while the one piece handle is made of a material resistant to the grease and corrosives normally associated with gasoline engine repair. The three sizes of cups provided in this set cover most small engine and automotive valves.

Why lap valves and seats? Lapping is the most effective means of touching up slightly burned valves and seats, to restore like-new performance at minimum expense. Even after grinding, a slight lapping operation may be desirable. Modern valve refacing and reseating methods bring sealing surfaces into nearly full contact. However, slight irregularities, caused by vibration of equipment used over a long period, make this extra lapping step the best way to be certain of a perfect job.

The perfect tool for lapping must hold the valve firmly, flex without popping off, spin easily between the mechanic's hands and lift without losing its grip. The Powr-Grip Valve Grinder does all these.

A single stroke of the pump attaches the cup with a much higher vacuum than is possible with small push-on cups, and provides a vacuum reservoir that reduces unexpected pop-off. Handle size and shape, and cup flexibility provide optimum ease and efficiency in spinning and lifting the valve. Spinning provides the grinding action...and periodic lifting is necessary to allow the abrasive compound to reposition itself uniformly on the valve and seat. After the final cleaning of compound from the valve, we recommend a few turns with oil to lift the remaining compound from the pores of the metal and to allow more accurate clearance adjustments. A well seated valve, guided centrally and given proper clearance, is almost certain to give long service.

The Powr-Grip Valve Grinder comes in a see through, easy-to-hang, package, that makes it easy to find when you need it.