Part of the Yanmar Parts Manuals.
A crankshaft ground 0.25 undersize is scrap the day you guess at the bearing set that goes back on it, and page 3 of this catalog lists the matching undersize main bearing for the 4TNV94L-NHZ by exact Yanmar part number. That is the job this book does across 22 pages, publication Y00W0720, covering the Yanmar 4TNV94L-NHZ (serial prefix E/#00185) along with the 4JH-DT, 4JH-DTZ, 4JH-DTZA, and 4JH-DTZY.
Sixteen bookmarked sections walk the engine from cylinder block to gasket set: gear housing, cylinder head and bonnet, camshaft and driving gear, crankshaft and piston, lube oil and cooling water systems, fuel injection pump, governor, injection valves, fuel line, starting motor, and generator.
Whether the engine is apart on a stand or you are chasing one weeping seal, you match the part in your hand to a number, order once, and get back to assembly.
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 |
|---|---|---|
| Oil Sump Drain Plug Thread Size | M22 | p. 5 |
| Plug size | 55 | p. 3 |
| Plug PT3/8 screw | PT3/8 | p. 3 |
| Main Bearing Undersize | 0.25 | p. 3 |
| Bearing type | #6205 | p. 4 |
| O-ring size | P20 | p. 4 |
| Drain Plug size | M22 | p. 5 |
Yanmar 4TNV94L-NHZ / 4JH-DT Series Common Problems This Manual Covers
Cranks but will not start
On these Yanmar diesels a no-start usually traces to fuel delivery: a plugged filter, air in the lines, or a tired feed pump. The Fuel Line section lists the fuel oil filter, feed pump assembly, pipes, and protectors by part number so you replace the weak link instead of guessing.
Manual Section: Fuel Line p. 17Rough running from worn injectors
Poor spray pattern from a worn nozzle shows up as rough idle, smoke, and lost power. The Fuel Injection Valve section breaks the injector down into nozzle assembly, holder, spring, and shim pack, so you can renew nozzles or reshim rather than buying complete injectors blind.
Manual Section: Fuel Injection Valve p. 16Erratic fuel delivery under load
Hard starting and uneven power often point back at the injection pump itself. The Fuel Injection Pump section covers the pump assembly, delivery valve assemblies, damper, and timer set, giving you the numbers to order internals or a complete replacement pump.
Manual Section: Fuel Injection Pump p. 13Oil leaks at sump and seals
Oil weeping from the sump joint, drain plug, or rear seal area is routine on engines with hours on them. The Flywheel Housing & Oil Sump section lists the sump assembly, M22 drain plug, seal washer, and liquid gasket called for at reassembly.
Manual Section: Flywheel Housing & Oil Sump p. 5Overheating and coolant loss
A slipping V-belt, stuck thermostat, or leaking water pump will cook a diesel quickly. The Cooling Water System section lists the water pump assembly, gasket, pulley, V-belt, thermostat, and hoses so a cooling overhaul goes in as one parts order.
Manual Section: Cooling Water System p. 12Starter clicks or spins without engaging
Starter faults usually come down to the magnetic switch, pinion, or clutch assembly rather than the whole unit. The Starting Motor section itemizes the armature, field coil, pinion, clutch, and switch assemblies, so you can rebuild the starter on the bench instead of replacing it outright.
Manual Section: Starting Motor p. 18Bottom end wear at rebuild
Scored pistons, tired rings, and loose rod bearings are what you find once the sump is off. The Crankshaft & Piston section lists the crankshaft, gear, pistons with rings, ring sets, and connecting rod assemblies by number for a proper bottom end refresh.
Manual Section: Crankshaft & Piston p. 10Frequently Asked Questions
Which Yanmar engines does this parts catalog cover?
It covers the Yanmar 4TNV94L-NHZ (serial prefix E/#00185) along with the 4JH-DT, 4JH-DTZ, 4JH-DTZA, and 4JH-DTZY. The parts tables note which models each part number applies to, so you can confirm fit for your engine before ordering.
Is this a service manual with torque specs and procedures?
No, this is a factory parts catalog. It identifies components by Yanmar part number across 16 systems, from Cylinder Block through the Gasket Set. Use it to order the right bearings, seals, and gaskets; clearances and torque sequences belong to a separate service manual.
Does it cover the fuel system in detail?
Yes. The Fuel Injection Pump section (pages 13 to 14) lists the pump assembly, delivery valves, damper, and timer set; the Fuel Injection Valve section covers nozzle assemblies, springs, and shim packs; and the Fuel Line section lists the fuel filter, pipes, and feed pump. p. 13
Does it list undersize bearings for a reground crankshaft?
Yes. The Cylinder Block section lists the main bearing set for the 4TNV94L-NHZ, including a 0.25 undersize part number, plus the thrust bearing. Pistons, ring sets, and connecting rod assemblies are in the Crankshaft & Piston section on page 10. p. 3
How will I receive this Yanmar 4TNV94L-NHZ Parts Catalog?
You get a 22-page searchable PDF (1 MB) that downloads instantly after checkout. Open it on your laptop, tablet, or phone, and bring it right to the shop floor.
Can I print specific sections of this Yanmar 4TNV94L-NHZ Parts Catalog?
Absolutely. No DRM or copy protection. Print the whole manual or just the pages you need. Any home or office printer works.
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