Part of the Yanmar Parts Manuals.
Lay the injection pump from a 3TN63L-UNH2 on the bench and you are looking at a plunger with barrel, a delivery valve with seat, and a rack, each carrying its own Yanmar part number and each easy to order wrong from memory. This is Yanmar publication 0CD10-G43800, the factory parts catalog for the 3TN63L-UNH2 industrial diesel, spec Y00D4380: 18 pages of exploded views and numbered parts lists straight from the OEM.
Every group gets its own page: cylinder block, cylinder head, crankshaft and piston, camshaft and drive gear, lubrication and cooling water systems, injection pump, governor, injectors, fuel pipes, engine stop device, starting motor, generator, and the optional gasket set. Order a main bearing or ring set from memory and you pay twice: once for the wrong part, again for the second teardown. Look the number up here instead, then print the page you need and let it get dirty on the bench.
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
Hard starting from air in the fuel
Air sneaking in through a loose strainer cup or a tired feed pump is the classic reason this engine cranks without firing. The Fuel Pipes page lists the fuel feed pump assy, strainer assy, cup, element, and separator assy so you can replace the leak path instead of chasing it.
Manual Section: Fuel Pipes p. 14Injection pump wear from dirty fuel
Contaminated fuel scores the plunger and delivery valve, and the engine answers with rough running and lost power. The Fuel Injection Pump page breaks the pump down to the plunger with barrel, delivery valve with seat, holder, and rack, each with its Yanmar number.
Manual Section: Fuel Injection Pump p. 11Clogged or dribbling injector nozzles
White smoke and uneven combustion usually trace back to a nozzle that no longer atomizes. The Fuel Injection Valve page identifies the nozzle assy, holder, spring, and valve so you order the right pieces the first time.
Manual Section: Fuel Injection Valve p. 13Overheating from cooling water system faults
A worn cooling water pump, a slipping V-pulley, or a stuck thermostat will send the temperature climbing. The Cooling Water System page lists the pump, gasket, V-pulley, fan, and the 71 C opening temperature thermostat this engine takes.
Manual Section: Cooling Water System p. 10Low oil pressure from neglected filtration
Dirty oil and a clogged filter starve the bearings, and the next stop is crank damage. The Lub. Oil System page covers the lube oil pump assy, filter, dipstick, and gaskets for putting the oil circuit right.
Manual Section: Lub. Oil System p. 9Dust ingestion wearing rings and bores
An intake that bypasses at the air cleaner lets grit into the bores and compression follows it out. The Suction Manifold page lists the air cleaner case assy, element, manifold, and gaskets to restore a sealed intake.
Manual Section: Suction Manifold p. 5Stop solenoid fails, engine will not shut down
When the stop circuit gets sloppy the engine either dies unexpectedly or refuses to shut off. The Engine Stop Device page shows the solenoid, bracket, link, bush, and snap pin so you can rebuild the linkage completely.
Manual Section: Engine Stop Device p. 15Frequently Asked Questions
Which engine does this parts catalog cover?
The Yanmar 3TN63L-UNH2 industrial diesel engine, spec code Y00D4380. It is Yanmar publication 0CD10-G43800, so the part numbers apply to this engine regardless of what equipment it is installed in.
Can I use it to identify parts for a full rebuild?
Yes. The Crankshaft & Piston section lists the crankshaft assy, pistons, ring sets, and rod assys, the Cylinder Block section covers main and thrust bearings, and there is an optional Gasket Set page for resealing the engine on reassembly. p. 8
Does it cover the cooling system?
Yes. The Cooling Water System section lists the cooling water pump, gasket, V-pulley, and fan, along with the thermostat, which the catalog identifies by its 71 C opening temperature. p. 10
Are the starter and charging components included?
Yes. The Starting Motor section breaks the starter down to the magnetic switch, pinion assy, armature assy, and housing, and the Generator section lists the stator assy, flywheel assy, current limiter, and key switch. p. 16
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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