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Show Cold-Weather Tests for Good Water Circulation One cold winter morning, when Johnston stepped on the starter of his car, the engine hesitated momentarily, momen-tarily, although it finally turned- over and began to run. The radiator that morning was frozen, but Johnston attributed at-tributed this to running the car out in the cold. For-several months afterward aft-erward he noticed that on long-continued runs the engine boiled. Finally, Final-ly, when the car was placed In the repair shop, he learned that the retaining re-taining pin of the pump rotor had been sheared. Unquestionably this had happened on the frosty morning when the radiator radi-ator was found frozen. The -car had MOLES TAPPfP IN PL'KP CAblNGAOJACEMTfo f WATTS HUB OF IMPELLER -rjAii PUMP 1 PIPE PLUGS dSA V fY 1 . lOWTRfl05E -J? fiCk "vT PRESS 1 'I 1 jf Simple Methods for Testing Rotor or Radiator. been driven continuously since that time with the pump failing to deliver any circulation. Johnston then made use of two simple sim-ple methods shown in the illustration for testing whether Hie pump rotor is broken or If the radiator Is frozen. Two holes are tupped through tho pump casing directly opposite the huh whore tho- shear pin is placed, and small pipe plugs are sot into them l!y removing the upper plug it Is pos sible to detenniij" if the pinup pro poller revolves with the shaft- when over the car shows signs of overheating, overheat-ing, and the .removal of both plugs makes it a simple mailer to renew dowel pin quickly. The tost for freezing Is made hy pressing between the fingers the lower rubber hose conned ion to the radiator. When frozen or partly frozen the hose does not collapse readily and it Is necessary to thaw it out. Popular Science Monthly. |