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CHART NO.  20 LOSS OF COOLANT OR ENGINE OVERHEATING (cont)
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TM-5-4210-230-14P-1 Aerial Ladder Fire Fighting Truck Manual
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CHART NO.  22 ENGINE GOVERNOR DOES NOT OPERATE - NO ENGINE SPEED CONTROL
ENGINE DIVISION SERVICE MANUAL TM 5-4210-230-14&P-1 CHART NO.  21 SMOKE FROM VEHICLE EXHAUST SYSTEM The color or type of visible smoke from vehicle exhaust can provide clues as to the source of the problem.  Three types of "smoke" are generally common to gasoline engines: White Smoke Visible white "smoke" in exhaust results from coolant entering the combustion chambers or exhaust system.  Check for failed cylinder head gasket or cracked cylinder head casting. If ok, check for cracked crankcase. Black Smoke Results from over rich fuel mixture.  Check for partially closed choke, or carburetor flooding condition.  An over rich mixture usually causes rough engine operation.  Perform steps covered in Diagnostic Chart No.  15. Blue or Blue-gray Smoke Results  from  oil  entering  the  combustion  chambers  or  exhaust  system.    Check  PCV  system  per  CTS*  Emission  Control section. 1.  Blue smoke noted during wide open throttle operation indicates worn or stuck piston rings. 2.  Blue smoke noted during deceleration (high vacuum) indicates failedor worn valve stem seals or worn valve guides. Refer to appropriate CTS * engine section for repair of above difficulties. * See CTS or CGES CGES-215 - Page 39 PRINTED IN UNITED STATES OF AMERICA

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