TM-9-2320-280-20 HMMWV Technical Manual Unit Maintenance Volume 1 Download
Page 210 of 890
WARNING TM 9-2320-280-20-1 REFERENCE INFORMATION Be careful when performing this test. Exhaust gas can be extremely hot end severe bums can result. Put a piece of paper in the exhaust stream for a few moments with the engine at idle. Then look at the paper to see if there is any condensed fuel on it. Then smell the paper to see if it smells like raw fuel. If it smells like fuel then the engine could be very cold or else it has a DS level fuel system fault or compression fault. White smoke for a short time after start up, especially on a cold day, is a normal condition. It is caused by incomplete combustion of the fuel because of low cylinder temperature. It should clear up in a few minutes. If not you may have a bed head gasket, cracked block, or a restricted check valve. Check for restricted check valve (para. 3-35). FUEL SYSTEM 2-123