Need the factory part numbers for your Yanmar 4TNV94L-NHZ or 4JH-DT engine family? This 22-page parts catalog (OEM #Y00W0720) covers the 4JH-DT, 4JH-DTZ, 4JH-DTZA, and 4JH-DTZY variants with exploded views and OEM part numbers for every major assembly. Inside: 16 systems from cylinder block through gasket set, including crankshaft and piston breakdowns, complete fuel injection pump and nozzle holder assemblies, governor internals, cooling water pump, and the starting motor and generator sections. Each exploded view gives you numbered callouts and direct part references so you can confirm fitment before you order. The oil sump drain plug is listed at M22 thread, the kind of detail that saves a wasted trip to the parts counter. No more squinting at worn stampings or guessing from a catalog number that doesn't match. Bookmarked by system; search any assembly name or part description and land directly on the right page.
What's Inside This Yanmar 4TNV94L-NHZ / 4JH-DT Series Parts Manual
| System | Pages | Key Topics |
|---|---|---|
| Cylinder Block | 3 | Block Assy, Cylinder, Plug, Bush, Camshaft, Main Bearing Set, Bearing Assy, Thrust |
| Gear Housing | 4 | Housing Assy, Cover, G, Seal, Oil, Case, Gear, Pump Assy |
| Flywheel Housing & Oil Sump | 5 | Housing, Flywheel, GASKET.LIQUID, Sump Assy, Oil, Drain Plug, Seal Washer |
| Cylinder Head & Bonnet | 6-7 | Head Assy, Cylinder, Valve, Valve Spring, Rocker Arm, Bonnet Assy |
| Suction & Exhaust Manifold | 8 | Manifold, Air Intake, PACKING(INT.MANIFOLD, Exhaust, Gasket, Silencer, Heater, Air |
| Camshaft & Driving Gear | 9 | Camshaft Assy, Gear, Camshaft, Gear Assy, Idle, F.I.PUMP |
| Crankshaft & Piston | 10 | Crankshaft Comp, Gear, Crankshaft, Piston W/RING, Ring Set, Piston, Rod Assy, Connecting |
| Lub.Oil System | 11 | Dipstick, LUB.OIL, Filter, Pipe Assy, Lub. Oil, Switch, (0.5KG)L.O., Joint Bolt |
| Cooling Water System | 12 | Pump Assy, Water, Gasket, Cw-P, Pulley, V-Belt, Thermostat, Hose a Assy |
| Fuel Injection Pump | 13-14 | Pump Assy, F.INJECT, Piston, Damper Assy, Valve Assy, Dilevery, Timer Set |
| Governor | 15 | Packing, Case, Cover, Spring, Lever, Regulator |
| Fuel Injection Valve | 16 | Valve Assy, F.INJECT, Nozzle Assy, Holder Assy, Nozzle, Spring, Shim Pack |
| Fuel Line | 17 | Filter, Fuel Oil, Pipe Assy, Fuel, Protector, Fuel Pipe, Pump Assy, Fuel Feed |
| Starting Motor | 18 | Starter, Armature Assy, Coil Assy, Field, Pinion Assy, Clutch Assy, Switch Assy, Magnetic |
| Generator | 19 | Rotor Assy, Ball Bearing, Pulley, Bracket Assy, Rear, Ajuster, Belt |
| Gasket Set | 20-22 | Packing, Seal, Valve Stem, Protector, Nozzle, O-Ring, Flex Horn |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| 4TNV94L-NHZ | ||
| Oil Sump Drain Plug Thread Size | M22 | p. 5 |
| Plug size | 55 | p. 3 |
| Spring Pin size | 6x12 | p. 3 |
| Plug PT3/8 screw | PT3/8 | p. 3 |
| Main Bearing Undersize | 0.25 | p. 3 |
| Parallel Pin size | 8x16 | p. 4 |
| Bolt M8x16 | M8x16 | p. 4 |
| Bearing type | #6205 | p. 4 |
| O-ring size | P20 | p. 4 |
| Bolt M10x35 | M10x35 | p. 5 |
| Drain Plug size | M22 | p. 5 |
| 4JH-DT, 4JH-DTZ, 4JH-DTZP, 4JH-DTZA, 4JH-DTZY | ||
| Screw M6x16 | M6x16 | p. 1 |
Yanmar 4TNV94L-NHZ / 4JH-DT Series Common Problems This Manual Covers
Yanmar 4TNV94L-NHZ main bearing undersize part number unclear when crankshaft is machined to non-standard dimensions p. 3
Check the Cylinder Block parts list on page 3. Standard and undersize main bearing sets are listed as separate line items: the undersize option is designated US=0.25 for this engine. If crankshaft journals have been machined 0.25 mm undersize, order that specific variant, not the standard set. The parts list shows five bearings required per engine.
Manual Section: Cylinder BlockGear housing oil seal and O-ring part numbers missing from initial engine reseal parts order p. 4
Open the Gear Housing exploded view on page 4. The parts list identifies the oil seal, O-ring P20, and ball bearing #6205 as individual line items with separate part numbers. Cross-reference each against the Gasket Set index on pages 20-22 to confirm whether they are already bundled in the full engine gasket kit before ordering them separately.
Manual Section: Gear HousingOil sump drain plug and seal washer part numbers needed after stripping the M22 drain plug threads p. 5
Locate the Flywheel Housing and Oil Sump exploded view on page 5. The drain plug carries an M22 thread designation and its own part number; the seal washer is a separate line item on the same page. If the flywheel housing gasket also needs replacement, the liquid gasket and housing components are listed as distinct entries in the same section.
Manual Section: Flywheel Housing & Oil SumpFuel injection pump assembly part number hard to confirm when catalog shows multiple variants across this engine family p. 13
Turn to pages 13-14 for the Fuel Injection Pump exploded view. The pump assembly, timer set, piston, and delivery valve assemblies each carry separate item numbers. Check quantity columns across model variants: differing quantities indicate model-specific fitment. Hardware common to all 4JH variants, including M6x16 screws (page 1), should be verified and ordered separately.
Manual Section: Fuel Injection PumpFrequently Asked Questions
What are the replacement specifications for cylinder head gasket?
The manual identifies the cylinder head gasket with part number 129906-01340, listed as GASKET, CYLINDER HEAD. This parts catalog does not provide further replacement specifications such as torque sequence, material, or thickness for installation.
What are the replacement specifications for starter?
The manual identifies the starter as STARTER(2.3KW) with part number 129900-77010, indicating a 2.3KW power rating. This parts catalog does not provide other replacement specifications, such as installation procedures or torque values.
What fuel injection pump components are covered in this parts catalog?
The fuel injection pump section (pages 13-14) lists the complete pump assembly, delivery valve assembly, timer set, and piston components for the 4TNV94L-NHZ engine. Can this manual be downloaded? Yes, the full parts catalog PDF is available for immediate download after purchase.
Which cooling system parts are listed in the Yanmar 4TNV94L-NHZ parts catalog?
The cooling water system section (page 12) covers the water pump assembly, thermostat, V-belt, pulley, and related hoses for the 4TNV94L-NHZ engine. This catalog is printable, you can print individual pages or the full document after downloading.
Document Quality
This is a scanned PDF document with an optical character recognition (OCR) layer, so you can search and copy the full text content. The text is generally crisp and easy to read throughout the document. All diagrams and illustrations are raster images, which appear somewhat pixelated when magnified, but their labels and part numbers remain consistently legible. The pages are clean, free from any significant scan artifacts, stains, or skewed content.
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