Yanmar 4JH4E Specifications
| Engine Model: Yanmar 4JH4E |
| Engine Type: 4-stroke inline 4-cylinder naturally aspirated water-cooled diesel |
| Total Displacement: 133.6 cu.in (2.19 L) |
| Rated Engine Power: 55.1 Hp (40.5 kW) at 3000 rpm |
| Fuel System Type: Direct injection |
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The Yanmar 4JH4E is a 4-cylinder, naturally
aspirated marine diesel engine from the JH4 series. This engine is
designed for pleasure craft and features direct injection (DI), fresh
water cooling with a heat exchanger, and a complete enclosed forced
lubrication system. The Yanmar 4JH4E is offered with multiple marine
gear options, including the KM35P, KM35A2, KM4A1, ZF30M, and the SD50
saildrive unit.
The Yanmar 4JH4E is a vertical, 4-cycle, water-cooled diesel engine
known for smooth operation and reliability in cruising sailboats and
power vessels. The “E” designation signifies the naturally aspirated,
standard-duty iteration within the JH4 family. This engine provides a
high displacement of 2.190 liters from a compact four-cylinder block,
delivering 54 hp at 3000 rpm.
The direct injection combustion system enhances fuel efficiency compared
to older indirect injection designs. A 12V electrical system and a
standard 80A alternator support modern onboard power demands. The engine
complies with EPA Tier 2 and EU 2006 emissions standards. A performance
upgrade variant, the 4JH4AE, features a new direct fuel injection system
and larger intake valves.
Engine Family: Yanmar JH Series.
Configuration: Vertical in-line 4-cylinder, 4-stroke diesel.
Displacement: 2.190 L (133.6 cu.in).
Bore x Stroke: 88.0 mm x 90.0 mm (3.46 in x 3.54 in).
Compression Ratio: 23.5:1.
Firing Order: 1-3-4-2.
Aspiration: Naturally aspirated (NA).
Fuel System: Direct injection (DI).
Injection Timing: 13° ± 1° BTDC (FID - Fuel Injection Timing).
Injection Opening Pressure: 21.6 ± 0.5 MPa (3133 ± 73 psi).
Maximum Output (Crankshaft): 40.5 kW (55.1 hp) at 3000 rpm.
Maximum Output (Continuous): 38.5 kW (52.3 hp) at 3000 rpm.
Continuous Rating (Propeller Shaft): 36.8 kW (50.0 hp) at 2907 rpm.
Maximum Torque: 142 Nm (104.7 lb-ft) at 1800-2000 rpm.
Cruising RPM Range: 2400-2700 rpm.
Rotation Direction (Crankshaft): Counter-clockwise viewed from stern.
Rotation Direction (Propeller Shaft - Ahead): Clockwise viewed from
stern.
Material: Cast iron.
Cylinder Liners: Parent bore (no replaceable wet liners).
Number of Cylinders: 4.
Bore Diameter: 88.0 mm (3.46 in).
Main Bearings: 5 main bearing caps.
Material: Cast iron.
Valvetrain: Overhead valve (OHV) with pushrods and rocker arms.
Valves per Cylinder: 2 (1 intake, 1 exhaust).
Total Valves: 8.
Valve Clearance (Cold - Intake and Exhaust): 0.20 mm (0.008 in).
Combustion System: Direct injection.
System Type: Direct injection with mechanical inline injection pump.
Injection Pump: Inline mechanical pump with mechanical governor.
Fuel Feed Pump: Electric fuel feed pump (4JH4AE).
Fuel Feed Pump: Manual feed pump (base models).
Injectors: Mechanical nozzle-and-holder type.
Injection Timing: 13° ± 1° BTDC.
Injection Opening Pressure: 21.6 ± 0.5 MPa (3133 ± 73 psi).
Fuel Filter: Spin-on type with integral water separator.
Fuel Type: Diesel No. 1-D or No. 2-D.
System Type: Complete enclosed forced lubrication with trochoid pump and
oil cooler.
Oil Capacity (Total, including filter): 5.0-5.5 L (5.3-5.8 qt).
Oil Pan Capacity (Effective, min to max): 1.2 L (1.3 qt).
Oil Specification: API CD, CF-4, or higher; SAE 15W-40 or 10W-30.
Oil Change Interval: 500 hours or 24 months.
Oil Filter: Full-flow spin-on element.
System Type: Fresh water cooling with heat exchanger (indirect).
Coolant Capacity (Engine only): 6.0 L (6.3 qt).
Coolant Recovery Tank Capacity: 0.8 L (0.8 qt).
Thermostat (Opening Temperature): 71-82°C (160-180°F).
Raw Water Pump: Rubber impeller-type pump for seawater circulation.
Fresh Water Pump: Centrifugal pump.
Electrical System: 12V.
Starter Motor: 12 V / 1.4 kW.
Alternator (Standard): 12 V / 80 A.
Alternator (Optional): 12 V / 60 A.
Glow Plugs: 4 units (12 V) for cold starting.
Flywheel Major Dimension: 300 mm x 66 mm (11.8 in x 2.6 in).
Flywheel Housing: SAE configuration - Integrated with engine block.
Dry Weight (Engine only): 201 kg (443 lbs).
Dry Weight (including marine gear): 213-228 kg (469-503 lbs) depending
on transmission.
Overall Length: 871 mm (34.3 in).
Overall Width: 560 mm (22.0 in).
Overall Height: 618 mm (24.3 in).
Oil Change Interval: 500 hours or 24 months.
Oil Filter Change: Every engine oil change.
Fuel Filter Change: Annually or 500 hours.
Raw Water Impeller Replacement: 200 hours or annually.
Coolant Change Interval: 1000 hours or 2 years.
Valve Clearance Inspection Interval: 500 hours.
Injection Timing Check: 1000 hours.
Injection Pressure Check: 1000 hours.
Anode Inspection (Heat Exchanger): Every 100 hours or seasonally.
V-Belt Inspection: Every 250 hours.
Cylinder Head Bolts (M12), Stage 1: 40 Nm (30 lb-ft).
Cylinder Head Bolts (M12), Stage 2: 80 Nm (59 lb-ft).
Connecting Rod Cap Nuts: 45 Nm (33 lb-ft).
Main Bearing Cap Bolts (M12): 70 Nm (52 lb-ft).
Flywheel to Crankshaft Bolts: 45 Nm (33 lb-ft).
Flywheel Housing to Block: 35 Nm (26 lb-ft).
Intake Manifold (M8): 18 Nm (13 lb-ft).
Exhaust Manifold (M10): 25 Nm (18 lb-ft).
Injector Hold-Down Clamp (M8): 20 Nm (15 lb-ft).
Glow Plug (M10): 18 Nm (13 lb-ft).
Oil Pan Drain Plug (M14): 35 Nm (26 lb-ft).
Thermostat Housing Bolts (M8): 10 Nm (7 lb-ft).
Valve Cover Bolts (M6): 7 Nm (5 lb-ft).
Sailboats: Cruising sailboats requiring auxiliary power (e.g., Baba 40).
Power Boats: Small displacement motor cruisers and fishing boats.
Generator Drive: Marine generator sets and auxiliary power units.
Transmission Options:
KM35P: Mechanical cone clutch.
KM35A2: Mechanical cone clutch.
KM4A1: Mechanical cone clutch.
ZF30M: Hydraulic transmission.
SD50: Saildrive unit (clutch dog type).
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