0114993 EVINRUDE GROMMET, Water tube, lower

General Information
All of the Series 300 OEM Engines are valve-in head, vertical in-line, diesel engines.Engine Lubrication System
Fig. 1-Oil Pressure Regulating ValveThe components of the lubrication system consist of an oil pump, oil filter, oil pressure, control valve, and an oil cooler, if equipped. The location of these components varies with engine model as shown in (1, 3, Fig. 1) for the oil pressure control valves and (2, 4, Fig. 1) for the oil coolers.As the system operates, the oil is pumped through the oil cooler (if equipped) and cooled by the engine coolant. The oil is then passed through the oil filter. After filtering, the oil is distributed to various areas of the engine to provide both cooling and lubrication.The oil pressure control valve (locations shown in Fig. 1) is used to maintain and regulate engine oil pressure. IMPORTANT: The oil filter is equipped with an oil pressure relief valve that allows the oil to pass if the filter would become plugged. Replace it only with a JOHN DEERE filter.Engine Cooling System
Fig. 2-Cooling SystemThe cooling system for the power unit consists of a radiator (1, Fig. 2), water pump (4), one or two thermostats located in the same area (2), and a water manifold located as shown (3) on some engines.The pump draws coolant from the bottom of the radiator and discharges it into the main coolant gallery on the right-hand side of the engine. Coolant from the gallery circulates through the block to cool block and cylinder liners, then flows into the cylinder head. From the cylinder head, the coolant passes into the water manifold and thermostat housing.
Fig. 3-Engine ThermostatIf the thermostat(s) Fig. 3 are closed (as during warm-up periods), coolant is directed back to the pump to be recirculated. This provides a faster and more uniform warm-up.The radiator is equipped with a 7 psi (0.5 bar) (0.5 kg/cm2) pressure cap which acts as a relief valve and keeps pressure within the system at 6.25 to 7.50 psi (0.4 to 0.5 bar) (0.4 to 0.5 kg/cm2) level. Pressurizing the system reduces the loss of coolant by evaporation, surging, or boiling. The efficiency of the system is therefore dependent on good seals at the radiator cap, hoses, and hose connections. All leaks, regardless of size, must be repaired quickly. A small drip can quickly become a stream under pressure.Fuel System
Fig. 4-Fuel SystemThe components of the fuel system consists of a fuel transfer pump (2, Fig. 4), fuel filter(s) (1), fuel injection pump (4), injection nozzles (3) and assorted fuel line between components.The fuel transfer pump delivers fuel from the tank to the filters.The filters remove impurities from the fuel.The injection pump pressurizes the fuel and sends it through the high pressure lines to the injection nozzles.Air Intake System
The components of the air intake system are the air cleaner and the intake manifold.Air enters the air cleaner. The air cleaner element removes impurities from the surrounding air.On diesel engines the air then enters the intake manifold which delivers it to the combustion chambers.Diagnosing Malfunctions
Engine Will Not Start or Starting Hard
Fuel System Malfunction Fuel tank emptyImproper type of fuelForeign material in fuelFuel lines clogged or restrictedAir leak on suction side of fuel systemFuel transfer pump malfunctionFuel filters restrictedFaulty injection pumpFaulty injection nozzlesWater, dirt, or air in fuel systemElectrical System Malfunction Corroded or loose battery cablesWeak or dead batteryUneven Running or Frequent Stalling
Basic Engine Malfunction Improper valve clearanceCylinder head gasket leakingValves sticking or burnedWorn or broken compression ringsLow compressionIncorrect timingDirty air intake systemExhaust system restrictedEngine overheatingFuel System Malfunction Improper type of fuelAir leak on suction side of fuel systemFuel line clogged or restrictedFuel filters restrictedFaulty injection pumpFaulty injection nozzlesWater, dirt, or air in fuel systemEngine Misses
Basic Engine Malfunction Weak valve springsIncorrect valve clearanceBurned, warped, pitted or sticking valvesLow compressionWorn camshaft lobesEngine overheatingFuel System Malfunction Incorrect timingWater, air or dirt in fuelFaulty injection nozzlesFaulty injection pumpMixture of gasoline and diesel fuelsLack of Power
Basic Engine Malfunction Blow cylinder head gasketWorn camshaft lobesIncorrect valve clearanceIncorrect valve timingBurned, warped, pitted, or sticking valvesWeak valve springsLow compressionDirty air intake systemIncorrect timingEngine overheatingFuel System Malfunction Improper type of fuelAir leak on suction side of fuel systemFuel line clogged or restrictedFuel supply pump malfunctionSpeed control linkage not adjusted properlyFuel filters restrictedFuel injection pump malfunctionFuel injection nozzle faultyWater, dirt or air in fuel systemInjection nozzle leak-off line cloggedInjection pump out of timeForeign material lodged in compressor impellerTurbocharger rotating assembly bearing seizureLeakage of turbocharger compressor air at turbocharger or manifoldLeakage of exhaust gas at manifold or turbochargerBlack or Gray Exhaust Smoke
Basic Engine Malfunction Incorrect engine timingEngine overloadedRestricted air intake systemDefective turbochargerFuel System Malfunction Improper grade of fuelExcessive fuel deliveryFaulty injection nozzlesInjection nozzle leak-off line cloggedInjection pump out of timeWhite Exhaust Smoke
Basic Engine Malfunction Low compressionFuel System Malfunction Faulty injection nozzleImproper fuelInjection pump out of timeAbnormal Engine Noise
Basic Engine Malfunction Excessive valve clearnceWorn cam followersBent push rodsWorn rocker arm shaftsWorn main or connecting rod bearingsForeign material in combustion chamberWorn piston pin bushings and pinsScored pistonIncorrect engine timingExcessive crankshaft end playLoose main bearing caps or rodsWorn timing gearsWorn oil pump gearsLow engine oil levelGears worn or brokenTurbocharger is Noisy or Vibrates (Do not confuse the whine heard during rundown with noise which indicates bearing failure.) Insufficient oil pressureAir intake restrictionTurbocharger bearing failure-wheel rubExcessive Oil Consumption-External Leakage
Basic Engine Malfunction Restricted crankcase breatherWorn valve guides or valve stemsPiston rings worn or brokenScored liners or pistonsExcessive ring groove wear in pistonRings sticking in grooves of pistonOil return slots in piston cloggedFront or rear crankshaft seal faultyCrankcase oil too thin (wrong viscosity)Turbocharger oil seal failureRestricted air intake systemSlow Acceleration
Fuel System Malfunction Faulty injection nozzleImproper fuelFaulty injection pumpDetonation
Fuel System Malfunction Improper Grade of FuelInjection pump out of timeFaulty injection nozzlesLow Oil Pressure
Basic Engine Problem Excessive main and connecting rod bearing clearanceLow oil levelLeakage at internal oil passagesFaulty oil pumpImproper oil (wrong viscosity)Defective oil pressure gaugeDefective pressure control valve springWorn or damaged pressure control valve or worn seatHigh Oil Pressure
Basic Engine Problem Stuck or improperly adjusted control valve.Engine Overheats
Basic Engine Malfunction Defective head gasketIncorrect engine timingLow coolant levelRadiator