Part of the Yanmar Repair Manuals.
Air in the fuel system will keep a 4JH cranking dead while the tide goes out, and the 48 pages of this Yanmar operation manual exist to get you past exactly that kind of stoppage: the bleeding procedure, the service intervals, and a troubleshooting chart that starts at the fuel shut off valve and works outward. It covers the 4JHE, 4JH-TE, 4JH-HTE, and 4JH-DTE marine diesel engines under Yanmar publication 129470-2E, in English.
Inside are the factory procedures for installation and engine bed preparation, fuel and lubricating oil selection, first start on a new engine, daily operation, storage and recommissioning, and periodical inspection of the fuel, lube oil, cooling, and electrical systems, plus piping and wiring diagrams for every variant.
When the engine is apart on the bench, page 29 carries the numbers that matter before reassembly: valve lash, injection timing, injector pop pressure, and the cylinder head torque sequence figures.
What's Inside This Yanmar 4JHE, 4JH-TE, 4JH-HTE, 4JH-DTE Manual
| System | Pages | Key Topics |
|---|---|---|
| Specifications | 6 | 1-1.Engine Specafications, 1-2.Marine Gear Spacifications |
| Names of Parts | 7-8 | Fresh Water Tank, Pressure Cap, Cooling Water Pump, Alternator, Exhaust Manifold, Turbo-Charger |
| Engine Installation | 9-14 | 3-1.Inspection After Unpacking, 3-2.Preparation of the Engine Foundation Plate, 3-3.Engine Installation, 3-4.Propeller, Propelleer Shaft, 3-5.Cooling Water Supply Device |
| After Launching | 15 | - |
| V.Fuel and Lubricating Oil | 16-17 | 5-1.Selection and Handling of Fuel Oil, 5-2.Selection of Lubricating Oil |
| Starting the New Engine for the First Time | 18-21 | 6-1.Supply of Fuel Oil, 6-2.Supply of Lubricating Oil, 6-3.Bleeding Air From the Fuel System, 6-4.External Inapection, 6-5.Checking the Instrument Panel Alarm System, 6-6.Tuening |
| Method of Operation | 22-26 | 7-1.Starting, 7-2.Cautions After Starting the Engine, 7-3.Cautions During Operation, 7-4.Stopping |
| Storage | 27 | 8-1.Storing, 8-2.Removing Engine From Storage |
| Periodical Inspection and Maintenance | 28-36 | 9-1.Fuel Oil System, 9-2.Lubricating Oil System, 9-3.Cooling Water System, 9-4.Inspection of Engine Body, 9-5.Washing the Air Intake Silencer Element, 9-6.Electrical Equipment |
| Trouble Shooting | 37-40 | Incorrect Speed Control Position, No Fuel, Fuel Shut Off Valve Closed, Defective Fuel Feed Pump, Clogged Fuel Filter, Air in Fuel System |
| Fuel Oil, Lubricating Oil and Cooling Water Piping Diagram | 41-42 | 11-1.4JH-TE, 4JH-Hte, 4JH-Dte, 11-2.4JHE |
| Electrical Wiring Diagram | 43-45 | Battery, Air Heater, Stop Button, Key Switch, Alternator, Water Temp. Switch |
| Optional Device | 46-47 | Air Heater, Electric Type Engine Stopping Device, Solenoid, Engine Stop Lever, Intake Manifold, Relay |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| All Models | ||
| Cylinder head tightening torque (M10) | 8 ± 0.5 kg-m | p. 29 |
| Alternator belt tension (with 10kg thumb force) | 10mm | p. 29 |
| Fuel injection pressure | 200±5kg/cm² | p. 29 |
| Fuel injection timing | bTDC12°±1° | p. 29 |
| Fuel filter replacement interval | Every 300 hours | p. 28 |
| Cooling water pipe inside diameter | 25.4 mm | p. 11 |
| Impeller check/replacement interval (sea water pump) | Every 600 hrs | p. 28 |
| 4JH-TE, 4JH-HTE, 4JH-DTE | ||
| Compressor cleaning interval (standard) | Every 150 hours | p. 36 |
| Compressor cleaning interval (with fresh water) | Every 50 hrs | p. 36 |
| 4JHE | ||
| Continuous rating output (DIN 6270A) | 40 hp/3500 rpm | p. 6 |
| 4JHE, 4JH-TE, 4JH-HTE | ||
| Engine Lube oil capacity (Crank case) (4JHE, 4JH-TE, 4JH-HTE) | 6.5ℓ | p. 6 |
| 4JH-DT(B)E | ||
| Engine Lube oil capacity (Crank case), 4JH-DT(B)E | 8.0ℓ | p. 6 |
Yanmar 4JHE, 4JH-TE, 4JH-HTE, 4JH-DTE Common Problems This Manual Covers
Engine cranks but will not start
On these engines a no-start usually traces back to no fuel, a closed fuel shut off valve, a clogged fuel filter, a weak feed pump, or air trapped in the fuel system. The troubleshooting chart walks each cause in order so you stop guessing and start eliminating.
Manual Section: X. Trouble Shooting p. 37Black smoke and power loss under load
On the turbocharged 4JH-TE, 4JH-HTE, and 4JH-DTE, a fouled or failing turbo shows up as heavy black smoke and a boat that will not reach rated revs. The manual covers inspecting the RHB52 turbocharger and calls for cleaning the compressor every 150 hours, or every 50 hours if cleaned with fresh water.
Manual Section: IX. Periodical Inspection and Maintenance p. 28Overheating from a worn seawater impeller
A hardened or shredded impeller in the cooling water pump (sea water pump) starves the cooling circuit and sends the temperature climbing. The maintenance schedule has you check the impeller every 600 hours and replace it, with the cooling water system inspection procedure alongside.
Manual Section: IX. Periodical Inspection and Maintenance p. 28Alternator not charging, alarm circuit faults
A dead battery, a silent alarm buzzer, or a water temperature warning that never trips are wiring problems before they are engine problems. The wiring diagram lays out the battery, key switch, stop button, air heater, alternator, and water temp switch circuits so you can trace a fault with a meter instead of pulling parts.
Manual Section: XII. Electrical Wiring Diagram p. 43Water and dirt in the fuel
Contaminated fuel is behind most injection trouble on a small marine diesel, from clogged filters to rough running. This section covers selecting and handling fuel oil and choosing the right lubricating oil, which is where clean injection starts.
Manual Section: V. Fuel and Lubricating Oil p. 16Corrosion and stuck parts after layup
An engine put away wet for the winter comes back with corroded cylinders and seized accessories. The storage procedures cover preparing the engine for layup and the checks to make when removing it from storage, before you swing the key.
Manual Section: VIII. Storage p. 27Vibration from poor engine bed alignment
A 4JH set down on a badly prepared foundation transmits vibration through the hull and wears the drivetrain. The installation section covers preparing the engine foundation plate, setting the engine, and aligning the propeller shaft, plus the cooling water supply plumbing.
Manual Section: III. Engine Installation p. 9Frequently Asked Questions
Which engines does this manual cover?
It covers four Yanmar marine diesels: the naturally aspirated 4JHE and the turbocharged 4JH-TE, 4JH-HTE, and 4JH-DTE. It is the English-language Yanmar operation manual, publication 129470-2E, 48 pages, and includes marine gear specifications alongside the engine data.
Does it give the service specs I need for adjustment work?
Yes. The Periodical Inspection and Maintenance section lists intake and exhaust valve clearance at 0.2mm, fuel injection pressure at 200±5kg/cm², injection timing at bTDC12°±1°, cylinder head tightening torque (M10) at 8±0.5 kg-m, and alternator belt tension of 10mm deflection with 10kg thumb force. p. 29
Are wiring and piping diagrams included?
Both. The Electrical Wiring Diagram section covers the battery, key switch, stop button, air heater, alternator, and water temp switch circuits, and a separate section carries the fuel oil, lubricating oil, and cooling water piping diagrams, with one drawing for the 4JH-TE, 4JH-HTE, and 4JH-DTE and another for the 4JHE. p. 43
Does it list the maintenance intervals?
Yes. The Periodical Inspection and Maintenance section schedules the routine work, including replacing the fuel filter every 300 hours and checking the sea water pump impeller every 600 hours, and it covers the fuel, lube oil, cooling, and electrical systems plus the air intake silencer element. p. 28
Is this Yanmar 4JHE Operation Manual a digital download?
Instant PDF download. You get the full 48-page searchable Operation Manual immediately after payment. Open it on your laptop, tablet, or phone right in the shop.
Are there any print restrictions on this manual?
No restrictions at all. Print individual pages, full chapters, or the entire manual. The PDF is completely unlocked.
Are electrical wiring diagrams included in this Yanmar 4JHE Operation Manual?
Yes, an electrical wiring diagram is included to help trace the main circuits.
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