4. Oil pressure lowered Check if oil pressure gauge indicates wrongly Use recommended oil (replenish) Refer to engine overheat Disassemble engine or injection pump Replace with recommended oil Retighten Replace Disassemble engine - 40 - TECHNICAL INFORMATION Check oi l amount Too low Nor mal Check temper cooling ature Too high Nor mal Inspect oil quality Nor mal Check o valve il relief Water & f in oil uel mixed Impr oper Nor mal