TM 5-3825-226-24The 9S7373 Air Meter Group is used to checkthe air flow through the radiator core.9S7373 AIR METER GROUPPressure Cap TestTools Needed:9S8140 Cooling System Pressuring Pump Group.One cause for a pressure loss in the coolingsystem can be a bad seal on the pressure cap of thesystem. Inspect the pressure cap carefully. Look fordamage to the seal or to the surface that seals. Anyforeign material or deposits on the cap, valve, seal, orsurface that seals must be removed.The 9S8140 Cooling System Pressurizing PumpGroup is used to test pressure caps and to pressurecheck the cooling system for leaks.TYPICAL SCHEMATIC OF PRESSURE CAPA. Sealing Surface of cap and radiator.To check the pressure cap for the pressure thatmakes the pressure cap open, use the procedure thatfollows:1.Remove the pressure cap from the radiator.WARNINGIf the engine has been operated andthe coolant is hot, loosen thepressure cap to the first stop and letthe pressure out of the coolingsystem, then remove the pressurecap.9S8140 COOLING SYSTEM PRESSURIZINGPUMP GROUP2.Put the pressure cap on the 9S8140 CoolingSystem Pressurizing Pump Group.3.Look at the gauge for the exact pressure thatmakes the pressure cap open.4.Make a comparison of the reading on the gaugewith the correct pressure at which the pressurecap must open.NOTE: The correct pressure that makes the pressurecap open is on the pressure cap and is also in theSPECIFICATIONS.5.If the pressure cap is bad, install a new pressurecap.Radiator and Cooling System Leak TestsTo test the radiator and cooling system forleaks, use the procedure that follows:1.Remove the pressure cap from the radiator.WARNINGIf the engine has been operated andthe coolant is hot, loosen thepressure cap to the first stop and letthe pressure out of the coolingsystem, then remove the pressurecap.2-70
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