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4BY3-150 Marine

Yanmar 4BY3-150 · 4BY3 family: specifications, its industrial/tractor base engine, cross-referenced parts and where to buy them.

Likely marinized BMW B47 2.0 L (common-rail)

The 4BY3 is believed to use the BMW B47D20 2.0 L inline-4 common-rail diesel — the direct successor to the N47 (same 84 mm bore × 90 mm stroke, 1 995 cc), introduced in 2014, matching the 4BY3 launch year. Some internal wear parts may cross to BMW B47 numbers; verify dimensions against the BMW service schedule before ordering. Marine-specific externals are Yanmar-only.

🚜 Base engine likely

The Yanmar 4BY3-150 is likely a marinized BMW B47D20 2.0 L common-rail diesel (N47 successor; same 84×90 mm / 1995 cc, 2014 launch match). Some internals may cross to BMW B47 — verify before ordering. Marinized externals are Yanmar-only. No BMW donor BOM loaded yet. source

150 hp110.3 kW
1995 ccdisplacement
84×90 mmbore × stroke
4-cylcylinders
from 2014year range (approx)
Turbo + ICaspiration

common-rail turbo+IC (Yanmar datasheet)

📋 Full specifications 🚜 Industrial / tractor base 🔧 Aftermarket 16
Cheaper-part coverage · 4/8
🚜 Base engine ✓🌀 Impeller ✓💧 Raw-water pump🛢️ Oil filter ✓⛽ Fuel filter🌡️ Thermostat➰ Belt⚓ Anode ✓

A ✓ means at least one cheaper channel — aftermarket, the tractor/industrial base engine, or a standard component — exists for this engine in that category.

Parts by section · 53 assemblies

The exploded parts diagrams for the 4BY3-150, grouped by system. Open a figure for its callout part numbers and per-variant quantities.

Belts & pulleys

Fig 19 — V-BELT

Bilge & accessory pumps

Fig 35 — BILGE PUMP(OPTION)

Camshaft & timing gears

Fig 2 — LOWER TIMING CASEFig 17 — TIMING CHAIN LOWER P/DAMPERFig 18 — CAMSHAFT & TIMING GEAR CHAIN

Cooling – fresh water

Fig 29 — HEAT EXCHANGERFig 30 — HEAT EXCHANGER(INNER PARTS)

Cooling – sea water

Fig 13 — COOLING SEA WATER PIPE & EXHAUST BEND(OPTION)Fig 28 — COOLING PUMP(SEA WATER)Fig 32 — COOLING SEA WATER PIPE& COUPLING(ZT SPEC)

Crankshaft & flywheel

Fig 3 — FLYWHEEL HOUSINGFig 15 — FLYWHEEL & CYLINDER MOUNTING PARTS

Cylinder block

Fig 1 — CYLINDER BLOCK

Cylinder head & valves

Fig 7 — CYLINDER HEAD/VALVE TRAIN-CAMSHAFTFig 9 — CYLINDER HEAD COVERFig 20 — TOP COVER & V-BELT COVERFig 50 — VALVE(OIL STOP)(OPTION)

Electrical & instruments

Fig 8 — CYLINDER HEAD ATTACHED/GLOW PLUGFig 43 — STARTING MOTORFig 44 — ALTERNATORFig 45 — WIRE HARNESS(ECU)Fig 46 — WIRE HARNESSFig 48 — ECUFig 51 — VDO GAUGE(OPTION)

Fuel injectors & nozzles

Fig 40 — HIGH-PRESSURE PUMP/INJECTOR

Fuel lines, tank & filter

Fig 38 — FUEL OIL FILTERFig 39 — PUMP, FUEL LOWFig 41 — FUEL FILTERFig 42 — FUEL FILTER(OPTION)

Intake and Exhaust

Fig 10 — INTAKE MANIFOLDFig 11 — TURBOCHARGER & AIR FILTERFig 12 — AIR FILTER(OPTION)Fig 24 — LUB. OIL PIPE(TURBINE)Fig 25 — AIR COOLERFig 26 — AIR COOLER(INNER PARTS)Fig 33 — MIXING ELBOWFig 34 — MIXING ELBOW HIGH RISER(OPTION)Fig 47 — AIR HEATERFig 53 — (34A)MIXING ELBOW(ZT370 SPEC.)

Lubricating

Fig 4 — OIL PAN/LUB. OIL SUMPFig 21 — LUB. OIL PUMPFig 22 — LUB. OIL FILTERFig 36 — STEERING OIL COOLER

Mounting

Fig 5 — ENGINE BRACKET

Other / general

Fig 23 — ROTARY PUMP(OPTION)Fig 27 — WATER PUMPFig 31 — HOSE, FW PUMP

Pistons, rods & liners

Fig 14 — CRANKSHAFT WITH BEARING SHELLSFig 16 — PISTON & CONNECTING RODFig 37 — STEERING PUMP/PIPE

Tools & labels

Fig 6 — LABELFig 52 — TOOL

Transmission & drive

Fig 49 — ECU EXTENSION HARNES KIT(OPTION)
📚 Manuals & Sources
Specs— none yet
Operator's Manual— none yet
Service / Workshop Manual— none yet
Parts Catalog / List— none yet
More📖 Boat Inboard Engine Manuals Boat Manuals

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Category
Marine
Engine family
4BY3
Year range (approx)
from 2014
Cylinders
4
Rated output
150 hp (110.3 kW)
Bore × stroke
84 × 90 mm
Displacement
1995 cc
Max rpm
4000
Continuous rpm
3876
Aspiration
Turbocharged + intercooled

Related 4BY3 engines

4BY3-150Z4BY3-1804BY3-180Z