Part of the Yanmar Parts Manuals.
All 18 pages of this Yanmar 3TN63L-UNH2 Parts Catalog (OEM #0CD10-G43800) cover every component of the industrial engine, from cylinder block and gear housing through the fuel injection pump, governor, and optional gasket set. Inside: exploded views with factory part numbers for all 17 major assemblies, including crankshaft and piston, camshaft and drive gear, lubrication oil circuit, starting motor, and generator. Each cross-reference ties the assembly name directly to your Yanmar part number, so you can order by the book instead of guessing from a worn casting mark. Cooling system specs pin the thermostat opening at 71°C, and the vinyl pipe for that circuit is 12×500 mm. Done chasing the wrong part number across three websites. Bookmarked PDF: one tap to any assembly, exact part number in front of you, done.
What's Inside This Yanmar 3TN63L-UNH2, Y00D4380 Parts Manual
| System | Pages | Key Topics |
|---|---|---|
| Cylinder Block | 1 | Cylinder Block Assy, Camshaft Bush, Main Bearing, Thrust Bearing, Joint PT1, Cylinder Head $ Gasket |
| Gear Housing | 2 | Gear Case Cover Assy, Oil Seal, Knock Pipe, Filler Cover, Gear Housing Assy, Cover, $ Gasket, Blind Cover |
| Flywheel Housing & Oil Sump | 3 | Flywheel Housing, Flywheel Cover Cap, Oil Seal Case Assy, Oil Seal, Oil Sump Spacer, Oil Sump Assy |
| Cylinder Head & Bonnet | 4 | Vinyl 12X Pipe, Engine Lifter, Cylinder Head Assy, Valve Guide, Suction Valve, Exhaust Valve, Valve Spring, Spring Retainer |
| Suction Manifold | 5 | Air Intake Manifold, $ Gasket, Air Cleaner, Air Cleaner Element, Case Assy, Dust Pan Assy, Retainer, Band |
| Exhaust Manifold | 6 | Exhaust Manifold $ Gasket, Silencer $ Gasket, Washer |
| Camshaft & Drive Gear | 7 | Tappet, Push Rod, Camshaft Assy, Thrust Bearing, Camshaft Gear, Idle Gear Retainer, Idle Gear Shaft, Idle Gear w/ Bush |
| Crankshaft & Piston | 8 | Crankshaft Assy, Crankshaft Gear, V-pulley, Flywheel Assy, Ring Gear, Piston w/ Ring, Piston Ring Set, Connecting Rod Assy |
| Lub. Oil System | 9 | Lub. Oil Pump Assy, Lub. Oil Pump $ Gasket, Lub. Oil Dipstick, Dipstick Guide, Lub. Oil Filter, Oil Press Valve Assy, Oil Intake Pipe Assy, Oil Pressure Switch |
| Cooling Water System | 10 | Cooling Water Pump, Cooling Water Pump $ Gasket, Gasket $, Cooling Water Pump V-pulley, V-belt, Cooling Fan, Spacer, Thermostat Cover |
| Fuel Injection Pump | 11 | Fuel Injection Pump Assy, Plunger w/ Barrel, Retainer, Plunger Spring, Delivery Valve w/ Seat, Delivery Valve Spring, Delivery Valve Holder, Delivery Gasket |
| Governor | 12 | Governor Case Cover, Gasket, Governor Driving Set, Governor Weight Assy, Governor Sleeve, Link Color, Link, Governor Case Assy |
| Fuel Injection Valve | 13 | Fuel Injection Valve Assy, Fuel Injection Nozzle Assy, Valve w/ Case Holder, Valve Spring, Nozzle Spring Seat, Valve Stop Spacer, Injection Pipe Retainer, Fuel Inject Pipe |
| Fuel Pipes | 14 | $ Gasket, Fuel Feed Pump Assy, Fuel Strainer Assy, Strainer Cup, Retaining Ring, Spring, Element, Nylon Gasket |
| Engine Stop Device | 15 | Bush, Solenoid Link, Bracket, Engine Stop Solenoid |
| Starting Motor | 16 | Starter, Switch, Magnetic, Cover Assy, Rear, Pinion Assy, Amature Assy., Housing |
| Generator | 17 | Spacer, Belt Adjuster, Current Limiter, Current Limiter N, Coupler, Timer |
| Gasket Set (Optional) | 18 | Gasket Set, Cylinder Head Gasket, Valve Stem Seal, Nozzle Protector, Nozzle Gasket, Bonnet Gasket, Exhaust Manifold Gasket, Silencer Gasket |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Thermostat opening temperature | 71 C | p. 10 |
| Pipe, Vinyl Dimensions | 12x500 mm | p. 4 |
| Thermostat Opening Temperature | 71 C | p. 10 |
| Wrench Size (Small) | 10x12 mm | p. 18 |
| Wrench Size (Medium) | 14x17 mm | p. 18 |
| Wrench Size (Large) | 19x22 mm | p. 18 |
Yanmar 3TN63L-UNH2, Y00D4380 Common Problems This Manual Covers
Yanmar 3TN63L-UNH2 fuel injection nozzle assembly part number unclear between nozzle holder, spring, and valve subcomponents p. 13
Open the Fuel Injection Valve diagram on page 13. Identify the F.INJECT. NOZZLE ASSY line item first, then locate the holder and spring entries in the parts list. Order the VALVE W/CASE separately, as it is cataloged as its own assembly. Cross-reference each position number in the exploded view before submitting your parts order.
Manual Section: Fuel Injection ValveAir cleaner element part number for suction manifold hard to confirm, two similar assemblies listed in exploded view p. 5
Check the Suction Manifold parts list on page 5. Locate the AIR CLEANER CASE ASSY and trace its ELEMENT line item, cataloged separately from the case. Confirm the cleaner assembly matches your intake configuration, as the parts list includes both the case and element as individual catalog entries with distinct part numbers.
Manual Section: Suction ManifoldValve stem seal and guide part numbers for cylinder head replacement order, multiple components shown without clear grouping p. 4
Check the Cylinder Head and Bonnet diagram on page 4. Identify VALVE STEM SEAL and GUIDE parts by position number in the exploded view. On the 3TN63L-UNH2, the vinyl coolant pipe is cataloged at 12x500 mm as a separate line item. Pull seals, guides, nozzle protector, and the head gasket part numbers individually.
Manual Section: Cylinder Head & BonnetThermostat and cooling water pump parts for system service order unclear on parts exploded view p. 10
Open the Cooling Water System diagram on page 10. Locate the thermostat entry in the parts list; this unit is rated to open at 71°C, so confirm the replacement part matches that spec. Find the C.W.PUMP assembly and pull the fan, V-pulley, and pump gasket part numbers separately, as each is its own catalog line item.
Manual Section: Cooling Water SystemFuel injection pump plunger and barrel, delivery valve, and rack parts listed as separate catalog entries p. 11
Go to the Fuel Injection Pump diagram on page 11. Find PLUNGER W/BARREL in the parts list, which is a distinct catalog entry from the delivery valve assembly. Pull the VALVE W/SEAT and DELIV. VALVE HOLDER part numbers separately. The rack is also listed independently, so confirm each component's position number in the exploded view before ordering.
Manual Section: Fuel Injection PumpFrequently Asked Questions
What are the replacement specifications for fuel filters?
The manual identifies the fuel strainer assembly with part number 119225-55600 (REF 4) and the fuel filter element with part number 124550-55700 (REF 10). These part numbers can be used for replacement.
What are the replacement specifications for air filter / air cleaner element?
The air cleaner assembly is specified with part number 171033-12500 (REF 4), and the air cleaner element is specified with part number 171033-12510 (REF 5). These part numbers can be used for replacement.
How do you fix yanmar 3TN63L-UNH2 fuel injection nozzle assembly part number unclear between nozzle holder, spring, and valve subcomponents?
Open the Fuel Injection Valve diagram on page 13. Identify the F.INJECT. NOZZLE ASSY line item first, then locate the holder and spring entries in the parts list. Order the VALVE W/CASE separately, as it is cataloged as its own assembly. Cross-reference each position number in the exploded view before submitting your parts order.
How do you fix air cleaner element part number for suction manifold hard to confirm, two similar assemblies listed in exploded view?
Check the Suction Manifold parts list on page 5. Locate the AIR CLEANER CASE ASSY and trace its ELEMENT line item, cataloged separately from the case. Confirm the cleaner assembly matches your intake configuration, as the parts list includes both the case and element as individual catalog entries with distinct part numbers.
What format is this manual in?
Instant PDF download. You get the full 18-page searchable Parts Catalog immediately after payment. Open it on your laptop, tablet, or phone right in the shop.
Can I print specific sections of this manual?
No restrictions at all. Print individual pages, full chapters, or the entire manual. The PDF is completely unlocked.
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