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This valve is a Spendthrift
But it needn't be! Valve clearance trouble, with resulting fuel and power waste, is easily detected by the Sperry Engine Analyzer. By using vibration analysis to check each cylinder under normal operating conditions, valve clearances can be adjusted for smoother engine performance. Result...engines develop full power-run cooler-use less fuel-last longer. Vibration analysis, exclusive with the Sperry Engine Analyzer, can be employed either in flight or on the ground. When using the Engine Analyzer, valve clearance can be easily checked at each inspection and overhaul-a profitable procedure for airlines and executive aircraft operators. In addition to vibration analysis, the Sperry Engine Analyzer also provides detailed ignition analysis. It immediately detects, located and identifies irregularities in aircraft power plants-either during flight or on the ground. Aside from saving ground maintenance time, the Engine Analyzer enables the flight engineer to maintain proper operating conditions at all times and prevents unnecessary component replacements. Our nearest district office will give you complete data upon request. 
SPERRY PORTABLE ENGINE ANALYZER
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ENGINE ANALYZER IS MANUFACTURED AND LICENSED UNDER JOHN E. LINDBERG, JR. PAT. NO. 2518427. OTHER U.S. AND FOREIGN PATENTS PENDING. 
SPERRY GYROSCOPE COMPANY DIVISION OF THE SPERRY CORPORATION
GREAT NECK, NEW YORK. CLEVELAND. NEW ORLEANS. BROOKLYN. LOS ANGELES. SEATTLE. SAN FRANCISCO IN CANADA. SPERRY GYROSCOPE COMPANY OF CANADA, LIMITED, MONTREAL, QUEBEC