COOLING SYSTEMTM 5-3805-263-14&P-2TESTING AND ADJUSTINGFiller Cap and Pressure Relief ValveThe 9S8140 Cooling System Pressurizing PumpGroup is used to test pressure relief valves and topressure check the cooling system for leaks.8.One cause for a pressure loss in the cooling systemcan be a bad seal on the radiator filler cap (2).9.10.2.3.4.5.6.7.Install and tighten the filler cap.Remove hose (C) from adapter (B).Remove the pressure test plug (3) from the ra-diator top tank.Install the end of hose (C) in the hole for thepressure test plug (3).Operate the pump until the pointer on thepressure gauge no longer increases. The highestpressure indication on the gauge is the pointthat the relief valve opens. The correct pres-sure that makes the relief valve open is 14 to 18psi (95 to 125 kPa).If the relief valve does not open within pressurespecification, replacement of the relief valve isnecessary.If the relief valve is within specifications, checkthe radiator for outside leakage.Check all connections and hoses for the coolingsystem for outside leakage.If you do not see any outside leakage and thepressure reading on the gauge is still the sameafter 5 minutes, the radiator and cooling systemdoes not have leakage. If the reading on thegauge goes down and you do not see any outsideleakage, there is leakage on the inside of thecooling system. Make repairs as necessary.If a pressure indication is shown on the gauge,be sure to push release valve (A) to release allpressure in the system before removal of hose(C) from radiator.If the engine has been running and the coolantis hot, loosen the filler cap slowly and let thepressure out of the cooling system, then re-move the filler cap.11. Remove hose (C) from radiator test pressurelocation.12. Install plug in pressure test location.Inspect the filler cap carefully. Look for damage tothe seal or to the surface that seals. Any foreignmaterial or deposits on the cap, seal or surface thatseals, must be removed.Use the procedure that follows to pressure checkthe cooling system:1. Make sure the coolant level is above the top ofthe radiator core.Warning Light for Water TemperatureTools Needed: Thermistor Thermometer Group.If the engine gets too hot and a loss of coolantis a problem, a pressure loss in the cooling systemcan be the cause. If the light for water temperatureshows that the engine is too hot, look for coolant1-68
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