Need exact OEM part numbers for your Yanmar 4JH4AE marine diesel? This 56-page parts catalog (OEM #0CR10-M68301EN) covers every assembly in the 4JH4AE, from cylinder block to instrument panel. Inside: exploded-view diagrams for the complete engine, including camshaft and driving gear, crankshaft and flywheel, piston and connecting rod assemblies, dual cooling circuits (sea water and fresh water), fuel injection pump, governor, injection valves, wire harness, bilge pump, starting motor, and generator. Every diagram pairs with a numbered component list so you can cross-reference any part callout to its factory OEM number without guessing. The cylinder block section specifies 10 metal cap bolts and 8 plug-30 pieces per engine, exactly the per-component detail that stops a wrong-part order. No more dead-end searches on parts lookup sites. Bookmarked by system and keyword-searchable; open it on your phone at the parts counter and get the right number on the first call.
What's Inside This Yanmar 4JH4AE (Marine) Parts Manual
| System | Pages | Key Topics |
|---|---|---|
| Cylinder Block | 4 | Cylinder Block Assy, Camshaft Bush, Main Bearing, Thrust Bearing, Head Gasket, Bearing, Spacer, Cap |
| Gear Housing | 5 | Gear Case Cover, Oil Seal, Cover Assy, Relief Valve, Spring, Gear Case Flange, Filler Cover, Knock Pipe |
| Flywheel Housing | 6 | Flywheel R Housing, Oil Seal Case Assy, Oil Seal, Cap W |
| Mounting Foot | 7 | Foot, Flexible Mount, Flexible R Mounting, Shock Absorber Assy, Flexible N Mount Assy |
| Lub. Oil Sump | 8 | Oil Sump, 14X1 Gasket, Oil Sump Spacer, Oil Dipstick, Dipstick Guide Assy |
| Cylinder Head | 10 | Cylinder Head Assy, Valve Guide, Intake Valve, Exhaust Valve, Valve Spring, Spring Retainer, Valve Stem Seal, Valve Cap |
| Bonnet | 11 | Head Bonnet Assy, Plate, Breather Baffle, Diaphragm Cover, Diaphragm, Diaphragm Spring, Bonnet Gasket, Filler Cover |
| Suction Manifold | 12 | Intake Manifold Assy, Manifold Cover, 10X1 Gasket, Manifold Gasket, Heater, Gasket, Silencer, Silencer Pipe |
| Mixing Elbow | 13 | Elbow, Elbow N, Gasket, Water Pipe, Pipe Joint, Hose Clip |
| Camshaft & Driving Gear | 14 | Tappet, Push Rod, Camshaft Assy, Thrust Bearing, Camshaft Gear, Idle Shaft, Idle Gear Assy, Idle Gear Bush |
| Crankshaft & Flywheel | 15 | Crankshaft Assy, Crankshaft Gear, V-Pulley, Flywheel Assy, Ring Gear, Damper D190 Disk, SP10 Coupling, Damper Disk |
| Piston & Connecting Rod | 16 | Piston Assy, Piston Ring Set, Ring, Connecting Rod Assy, Crank Pin Bearing, Piston Pin Bearing, Bearing |
| Lub. Oil System | 17 | Gasket, Oil Inlet Pipe Assy, Oil Cooler Assy, Filter Bracket Assy, Filter, Joint, Water Pipe Assy, Corrugated Tube |
| Lub. Oil Pipe | 18 | Oil Pipe Assy, Joint M8 Bolt Assy, Bolt, Washer |
| Cooling Sea Water Pump | 19 | Water Pump Assy, Impeller, Plate, Cover, Mechanical Seal, Pipe Joint, Pump Gear, Gasket |
| Cooling Fresh Water Pump | 20 | Water Pump Assy, Gasket, Plate, Flange, Water Pump Gasket, V-Pulley, Pump Joint Assy, A43 V-Belt |
| Cooling Fresh Water Cooler | 21 | Water Cooler Assy, Cw N Cooler Assy, Cap, Cooler Core Assy, Cooler a Cover Cmp, Gasket, Cooler Cover, Cock Assy |
| Cooling Sea Water Pipe | 22 | Water Pipe, Retainer, Pipe Retainer, Hose Clip, Joint, Csw S-Drive Pipe, Bracket, Pipe Joint |
| Cooling Fresh Water Pipe | 23 | Water Pipe, Hose Clip, Pipe W Retainer |
| Cooling Sea Water Strainer(Optional) | 24 | Strainer, 10X1000 Hose, Hose Clip, Nut |
| Bilge Pump(Std)(Optional) | 25 | Pump .Bilge, Bilge N Pump Assy, Motor Assy Pump, Controller, Inpeller |
| Bilge Pump(Dx)(Optional) | 26 | - |
| Bilge Pump (Optional) | 27 | Pump Assy, Motor Assy, Swith, Fuse, Strainer, Pipe Assy |
| Fuel Injection Pump | 28-29 | Injection Pump Assy, Gear Case W Cover, Head Assy, Piston, Spring, Delivery Valve Assy, Delivery N Valve Assy, Delivery W Spring |
| Governor | 30 | Gasket, Return Spring, Regulator Lever, Shaft Retainer, Stop Solenoid, Governor Case Cover |
| Fuel Feed Pump | 31 | Fuel Feed Pump Assy, Pump Bracket, Fuel Pipe, Band |
| Fuel Injection Valve | 32 | Injection Valve Assy, Nozzle Spring, Spring Seat, Plate |
| Fuel Injection Pipe | 33 | Pipe Retainer, Injection Pipe Assy, Bolt |
| Fuel Pipe & Fuel Strainer | 34 | Filter Bracket, Filter S Bracket, Fuel Filter, Fuel Pipe, Cap, Fuel Oil W Pipe |
| Oil/Water Separater | 35 | Separator Assy, Separator Assy N, Separator Assy Z, Element, Bracket, Joint, Separator Assy W, Spring |
| Fuel Tank(Optional) | 36 | Fuel Pipe Assy, Fuel Oil Tank Assy, Cap Assy, Nut |
| Cable Support | 37 | Governor Bracket, Retainer Assy, Ring, 8X1 Gasket, Bracket, Cable, Cable R, Mt- Remo-Con |
| Clutch | 38 | Clutch Assy, Clutch Assy W, Stud, Bolt |
| Coupling(Optional) | 39 | Taper Coupling, Coupling, D29 Coupling, Cupling Straight Zf |
| Starting Motor | 40 | S114-817A Starter, Switch Assy, Armature Assy, Yoke Assy, Brush Holder Assy, Brush Set, Brush Spring, Cover Assy |
| Generator | 41 | Alternater, Regulator Assy, Lead Wire, Pulley Nut Assy, Piece |
| V-Belt Cover | 42 | Grommet, Collar, Belt Cover, Caution W Label, Belt Cmp W Cover |
| V-Belt Cover & Generator Attachiment(Optional) | 43 | Grommet, Collar, Belt Cover, Belt Z Cover, V-Pulley, Alternator Bracket, Adjuster, Alternator Harness |
| Wire Harness & Sensor | 44-45 | Wire Harness, Protector, Protector R, Protector Z, Retainer N, Grommet, Collar, Safety Relay |
| Instrument Panel(B-Type)(Optional) | 46 | Instrument B Panel, Panel N, Instrument B N Panel, Panel with Coverfoil, Circuit, Circuit with Led & Bzr N, Seal, Wire Harness |
| Instrument Panel(C-Type)(Optional) | 47 | Instrument C Panel, C-Panel N, Instrument C N Panel, Panel with Coverfoil, Circuit, Circuit N, Circuit with Led & Bzr N, Seal Rubber |
| 44.(41A)Instrument Panel(B-Type : Keyles)(Optional) | 48 | Panel W, Panel N, B Keyless N Panel, Circuit, Circuit with Led & Bzr N, Seal, Tachometer, Tachometer N |
| 45.(41B)Instrument Panel(C-Type : Keyles)(Optional) | 49 | Panel W, Panel N, C Keyless N Panel, Circuit, Circuit N, Circuit with Led & Bzr N, Seal Rubber, Tachometer |
| Tools | 50 | Tool Box, Tool Bag, Driver, Wrench Assy, 10X13 Wrench, Nozzle Tool Assy, Nozzle Remove a Tool, Nozzle Remove B Tool |
| Gasket Set(Optional) | 51 | Gasket Set, Head Gasket, Bonnet Gasket, 10X1 Gasket, Manifold Gasket, Water Pump Gasket, Thermostat Gasket, Thermostat R Gasket |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Standard Finish Color (Packed in a can) | 4L | p. 2 |
| Standard Finish Color (Spray) | 1 piece | p. 2 |
| Cylinder Block Plug, PT1/4 quantity | 2 | p. 4 |
| Cylinder Block Bolt, Metal Cap quantity | 10 | p. 4 |
| Cylinder Block Plug, 30 quantity | 8 | p. 4 |
| Cylinder Block Bearing, Main quantity | 5 | p. 4 |
| Cylinder Block Bolt, Head quantity | 18 | p. 4 |
| Gear Housing Screw, M6X16 quantity | 7 | p. 5 |
| Flywheel Housing Bolt, M10X 25 PLATED quantity | 6 | p. 6 |
| Mounting Foot Bolt, M10X 22 PLATED quantity | 8 | p. 7 |
| Lub. Oil Sump Bolt, M8X 45 PLATED quantity | 24 | p. 8 |
| Cylinder Head Valve Spring quantity | 8 | p. 10 |
Yanmar 4JH4AE (Marine) Common Problems This Manual Covers
Yanmar 4JH4AE raw-water impeller replacement, need correct part number for sea water pump p. 19
Open the Cooling Sea Water Pump parts list on page 19. Locate the impeller in the exploded view and record the part number listed. Verify the part number against your engine serial number range noted on page 2 before ordering. The sea water pump assembly includes the impeller, housing, and cover plate components, all individually listed with quantities.
Manual Section: Cooling Sea Water PumpExhaust mixing elbow part number needed, corroded unit requires replacement p. 13
Find the Mixing Elbow exploded view on page 13. The elbow assembly, gasket, and associated pipe and joint components are each listed with individual part numbers. Cross-reference the gasket part number against the Gasket Set listing on page 51, where the manifold and bonnet gaskets are also itemized, to confirm you order the correct sealing set alongside the elbow.
Manual Section: Mixing ElbowFuel feed pump assembly parts needed, engine losing prime after sitting p. 31
Check the Fuel Feed Pump parts list on page 31. The pump assembly, bracket, fuel pipe, and clamp components are listed separately. Also review page 34 for the Fuel Pipe and Fuel Strainer exploded view, where the inline filter and strainer components are itemized. Order the pump assembly and strainer together if the unit has high hours.
Manual Section: Fuel Feed PumpOil filter and lubrication system components needed after low oil pressure warning p. 17
Turn to the Lub. Oil System parts diagram on page 17. The oil filter assembly, oil cooler assembly, and inlet pipe assembly are each listed with part numbers. Cross-reference the oil sump parts on page 8, which shows the drain plug, gasket, and dipstick guide assembly, to identify any sump-side components that also need replacement. The sump uses 24 bolts (M8x45) on the sealing flange.
Manual Section: Lub. Oil SystemFull gasket set needed for top-end overhaul, identifying correct head gasket part number p. 51
Open the Gasket Set list on page 51. The complete set includes the head gasket, oil sump gasket, water pump gasket, thermostat gasket, manifold gasket, bonnet gasket, and all associated O-rings and seals, each listed individually. Cross-check the cylinder head parts on page 10 to identify valve stem seals, which are listed separately from the gasket set and must be ordered independently.
Manual Section: Gasket Set(Optional)Engine mount shock absorbers need replacement, identifying correct mounting foot hardware p. 7
Refer to the Mounting Foot parts list on page 7. The shock absorber, mounting bolts (M10x22, 8 per engine), washers, and nuts are all itemized separately. Record the shock absorber part number from the exploded view and note the quantity before ordering, as all four mounts are typically replaced together to restore balanced engine alignment.
Manual Section: Mounting FootFrequently Asked Questions
What are the replacement specifications for raw-water impeller?
The raw-water impeller for the YANMAR 4JH4AE is identified by Part No. 129670-42531. This part is listed under the "COOLING SEA WATER PUMP" section. The manual does not provide further replacement specifications such as dimensions, material, or recommended service intervals.
What are the replacement specifications for heat exchanger?
The heat exchanger core for the YANMAR 4JH4AE is identified as "CORE ASSY, COOLER" with Part No. 129670-44460. This part is listed under the "COOLING FRESH WATER COOLER" section. The manual does not provide further replacement specifications such as dimensions, material, or recommended service intervals.
How do you fix yanmar 4JH4AE raw-water impeller replacement, need correct part number for sea water pump?
Open the Cooling Sea Water Pump parts list on page 19. Locate the impeller in the exploded view and record the part number listed. Verify the part number against your engine serial number range noted on page 2 before ordering. The sea water pump assembly includes the impeller, housing, and cover plate components, all individually listed with quantities.
How do you fix exhaust mixing elbow part number needed, corroded unit requires replacement?
Find the Mixing Elbow exploded view on page 13. The elbow assembly, gasket, and associated pipe and joint components are each listed with individual part numbers. Cross-reference the gasket part number against the Gasket Set listing on page 51, where the manifold and bonnet gaskets are also itemized, to confirm you order the correct sealing set alongside the elbow.
What format is this manual in?
A 56-page Parts Manual in searchable PDF format, available the moment you complete checkout. View on computer, tablet, or phone, with no shipping wait.
Can I print specific sections of this Yanmar 4JH4AE Parts Manual?
Yes, print as many copies as you want, and there are no restrictions. Many mechanics print the section they need and bring it to the shop floor.
Document Quality
This document is a scanned PDF, but it includes an OCR layer, so you can search and copy the full text. The text is generally crisp and easy to read throughout the catalog. Diagrams and illustrations are clear raster images, and their labels are readable, allowing for easy identification of parts. Pages are clean with no significant scan artifacts, stains, or skewed content, and there are no notable blank or filler pages.
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