. OPERATION TROUBLESHOOTING 3 - 175 ENGINE ( ) : Always contact your Komatsu distributor when dealing with these items. In cases of problems or causes which are not listed below, contact your Komatsu distributor for repairs. Problem Main causes Remedy Engine oil pressure caution lamp lights up Steam is emitted from top part of radiator (pressure valve) Engine water temperature gauge is in red range Engine cooling water temperature caution lamp lights up Engine water temperature gauge is in white range Engine does not start when starting motor is turned Exhaust gas is white or blue