Yanmar 4TNE88-3BY Parts Catalog

A 4TNE88 that only fires on starting fluid usually traces back to a clogged fuel element, a leaking joint, or contaminated fuel gumming the supply lines. The Fuel Pipe section lists the fuel strainer, taper valve, element, joints, and fuel oil pipes by part number so the whole supply path can go on one order.

Worn or contaminated nozzles lose pop pressure and leave one cylinder loafing while the exhaust turns white. The Fuel Injection Pipe section breaks each injector down into nozzle assembly, holder, spring, and check valve, so you can replace the worn pieces or the complete assembly.

Plunger wear and sticking delivery valves show up as low power and surging that no filter change fixes. The Fuel Injection Pump section itemizes the pump assembly, plunger, delivery valve, control rack, and fuel feed pump for a proper overhaul order.

Overheating is a standard failure area on these engines, whether the cause is a tired water pump, a stuck thermostat, or a slipping belt. The Cooling Water System section carries the water pump assembly, thermostat and thermostat case, fan, cooling water pipes, and the A37 V-belt.

A flickering oil light or knock under load means the lubrication circuit needs attention before a bearing burns in. The Lub.Oil System section identifies the oil pump assembly, oil filter, oil pressure sender, dipstick, and oil pipes so nothing gets overlooked in diagnosis.

Starter faults on these engines are usually brushes, a lazy magnetic switch, or a chewed pinion rather than a dead battery. The Starting Motor section lists the armature assembly, brush holder, pinion, clutch assembly, and magnetic switch individually, so you rebuild instead of replacing the whole motor.

Once compression testing sends the engine to the stand, the parts list gets long fast. The Crankshaft & Piston section covers the crankshaft assembly, pistons with rings, piston pins, connecting rods, crankpin bearings, and flywheel assembly, which is most of a bottom-end order in one place.