Factory reference OEM #0CR10-G45800 covers both the SA and G1A variants of the 1996 Yanmar 4TNE98 engine. Across 30 pages, this parts catalog details every assembly from the cylinder block to the governor. Each section provides full exploded views with OEM part numbers called out on individual components, including gear housing seals, camshafts, crankshafts, and fuel injection pump internals. Because both configurations are mapped, cross-referencing part numbers between variants is straightforward. Verify the main bearing under-size at 0.25 mm or check the starting motor output (2.3 KW) to ensure accurate sourcing. Stop guessing at suffixes and ordering from memory. The PDF is fully bookmarked by system, allowing fast searches to land on the exact diagram needed.
What's Inside This Yanmar 4TNE98-SA / G1A Parts Manual
| System | Pages | Key Topics |
|---|---|---|
| Cylinder Block | 4 | Cylinder Block Assy, Camshaft Bush, Main Bearing Assy, Thrust Bearing Assy, Cylinder Head Gasket |
| Gear Housing | 5 | Gear Housing Cover, Oil Seal, Fuel Injection Pump Cover, Liquid Gasket, Gear Housing Comp, Lub. Oil Pump Assy, Tachometer Gear Unit, Filler Cover |
| Flywheel Housing & Oil Sump | 6 | Fltwheel Housing, Flywheel Housing, Flywheel Cover Cap, Seal HTC95, Oil Sump Assy, Liquid Gasket |
| Cylinder Head & Bonnet | 7 | Breather Hose, Retainer, Engine Lifter, Cylinder Head Assy, Valve Guide, Suction Valve, Exhaust Valve, Valve Spring |
| Suction Manifold | 8 | Suction Manifold Gasket, Int Manifold, Earth Cord, Gasket, Air Heater |
| Exhaust Manifold | 9 | Gasket, Bolt, Stud |
| Camshaft & Driving Gear | 10 | Tappet, Push Rod, Camshaft Assy, Thrust Metal, Camshaft Gear, Idler Shaft, Idle Gear Assy, Idle Gear Bush |
| Crankshaft & Piston | 11 | Crankshaft Comp, Crankshaft Gear, V-Pulley, Flywheel Assy, Ring Gear, Piston W/ Ring, Ring Set, Connecting Rod Assy |
| Lub.Oil System | 12 | Dipstick, Dipstick Guide, Filter 80X80L, Lub. Oil Pipe Assy, Oil Pressure Switch, Retainer 6X, Round Gasket |
| Cooling Water System | 13 | Cooling Water Pump, Cw-P Gasket, Thermo C Switch, V-Belt, Pulley, Fan, Spacer, Gasket |
| Fuel Injection Pump | 14-16 | Plunger, Delivery Valve, Tappet, Camshaft, Control Rack |
| Fuel Injection Valve | 17 | Bracket, Fuel Valve, Fuel Injection Valve Assy, Nozzle, Nozzle Holder Assy, Nozzle Spring, Nozzle Spring Seat, Stop Plate |
| Fuel Line | 18 | Fuel Filter, Fuel Filter Body, Round Gasket, Pipe Joint, Fuel Pipe, Joint, Fuel Oil Pipe, Fuel Retn.pipe Joint |
| Engine Stop Device | 19 | Solenoid Bracket, Joint, Solenoid Link, Stop Solenoid |
| Starting Motor | 20 | Starter, Armature Assy, Field Coil Assy, Brush, Rear Cover, Brash Holder Assy, Brash, Pinion Assy |
| Generator | 21 | Rotor Assy, Stator Assy, Rear Cover Assy, Regulator Brush Assy, Brush Assy, Fan Side Guide, Diode Assy |
| Gasket Set | 22 | Cylinder Head Gasket, Valve Stem Seal, Nozzle Protector, Nozzle Seat, Bonnet Gasket, Suction Manifold Gasket, Cw-P Gasket |
| Governor | 23-24 | - |
| Feed Pump | 25 | - |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Thermostat Opening Temperature | 110 C | p. 13 |
| Starting Motor Power Output | 2.3 KW | p. 20 |
| Main Bearing Under-size | 0.25 mm | p. 4 |
Yanmar 4TNE98-SA / G1A Common Problems This Manual Covers
Engine overheating after 30 minutes of work despite a functional water pump p. 13
Review the Cooling Water System exploded view on page 13. Locate the thermostat case and verify the part number for the 110 C opening temperature thermostat. Cross-reference the water pump and V-belt components to source a complete cooling system replacement.
Manual Section: Cooling Water SystemHard starting or no start in cold conditions with slow cranking speed p. 20
Examine the starting motor electrical parts breakdown on page 20. Identify the correct replacement armature and brushes for the 2.3 KW starter assembly. Match the component part numbers to your specific serial number range before ordering internal electrical parts.
Manual Section: Starting MotorLower engine knock requiring full teardown and replacement of the main bearings p. 4
Consult the Cylinder Block parts number list on page 4. Find the specific part numbers required for the 0.25 mm under-size main bearing assembly. Verify the metal cap and bush identifiers in the diagram to secure the exact replacement hardware for the rebuild.
Manual Section: Cylinder BlockConstant fuel leak around the filter head and degraded rubber supply hoses p. 18
Replace degraded fuel lines every 2000 hours to prevent system leaks. Check the Fuel Line components on page 18. Locate the exact part numbers for the replacement fuel pipe, filter bowl O-ring, and joint clamps to secure the plumbing around the fuel filter.
Manual Section: Fuel LineFrequently Asked Questions
How do you fix yanmar 4TNE98-SA engine overheating after 30 minutes of work despite a good water pump?
Review the Cooling Water System exploded view on page 13. Locate the thermostat case and verify the part number for the 110 C opening temperature thermostat. Cross-reference the water pump and V-belt components to source a complete cooling system replacement.
How do you fix hard starting or no start in cold conditions with slow cranking speed?
Inspect the starting motor electrical parts breakdown on page 20. Identify the correct replacement armature and brushes for the 2.3 KW starter assembly. Match the component part numbers to your specific serial number range before ordering replacement internal electrical components.
What parts do I need for a full engine rebuild with lower knock on the Yanmar 4TNE98-SA?
Consult the Cylinder Block parts number list on page 4. Find the specific part numbers required for the 0.25 mm under-size main bearing assembly. Verify the metal cap and bush identifiers in the diagram to secure the exact replacement hardware for the rebuild.
How do I stop fuel leaks around the filter head and supply hoses on the 4TNE98-SA?
Replace degraded fuel lines every 2000 hours to prevent system leaks. Check the Fuel Line components on page 18. Locate the exact part numbers for the replacement fuel pipe, filter bowl O-ring, and joint clamps to secure the plumbing around the fuel filter.
Document Quality
This is a scanned PDF document with an OCR layer, meaning you can search and copy text from all pages. The text quality is crisp and consistently easy to read throughout the catalog. All diagrams and illustrations are clear raster images, and their labels are sharp and perfectly readable. The pages are very clean, showing no significant scan artifacts, stains, or skewed content. There are no notable blank or filler pages present in the document.
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