Model Series:
4LHA Series Marine Diesel Engine
Model Variants:
4LHA-STE, 4LHA-STZE, 4LHA-STP, 4LHA-STZP, 4LHA-DTE, 4LHA-DTZE, 4LHA-DTP, 4LHA-DTZP, 4LHA-HTE, 4LHA-HTZE, 4LHA-HTP, 4LHA-HTZP
Production Years Covered:
N/A - not specified in available manual data
Configuration:
Inline 4-cylinder, 4-stroke marine diesel
Aspiration:
Turbocharged; intercooled on 'Z' variants
Cooling System:
Raw water or freshwater (coolant) with heat exchanger, depending on model
Target Audience:
Marine engine owners, boatyards, mechanics, and technicians
Application:
Marine propulsion and auxiliary power in recreational and light commercial vessels
Key Strength:
Compact design, robust construction, reliable performance
Serviceability:
Widely supported by Yanmar's global marine service network
Power Range:
Typically 160 to 200 horsepower
Fuel System:
Direct injection
Variants:
Multiple ratings and configurations for varied duty cycles
Models Covered:
All Yanmar 4LHA Series variants listed in Basic Information
Coverage Areas:
Maintenance, troubleshooting, diagnostics, specifications, repair procedures
Manual Type:
Factory Service Repair Manual
Delivery Method:
Instant download
Page Count:
N/A - not specified
Engine Mechanical:
Cylinder head, block, pistons, crankshaft, bearings, timing gears
Fuel System:
Direct injection pump, injectors, fuel filters, lines
Cooling System:
Seawater pump, impeller, heat exchanger, thermostat, coolant circuit
Lubrication System:
Oil pump, oil filter, oil cooler, passages
Air Intake & Exhaust:
Turbocharger, intercooler (if equipped), manifolds, exhaust mixing elbow
Electrical System:
Alternator, starter, wiring, sensors, gauges
Transmission:
Marine gear options, linkage, fluid specifications
Maintenance:
Scheduled service, fluid changes, filter replacement, impeller replacement
Troubleshooting:
Diagnostic charts for common issues and fault finding
Repair:
Component removal, overhaul, inspection, reassembly
Adjustments:
Valve clearance, injection timing, belt tension
Specifications:
Torque values, clearances, wear limits, capacities
Diagrams:
Exploded views, flow charts, wiring schematics
Part Numbers:
OEM part numbers for service items and major components
Ordering:
Guidance on identifying and sourcing replacement parts
File Format:
PDF (searchable, bookmarked, zoomable)
Compatibility:
Windows, macOS, Linux, iOS, and Android — any device with a PDF reader
Requirements:
A PDF reader application (e.g. Adobe Acrobat Reader, free)
Searchability:
Fully text searchable for fast lookup of any topic
Print Quality:
High-resolution digital pages, printable at full clarity
Binding Type:
N/A — digital download, no physical binding
Paper Type:
N/A — digital download, no physical paper
Engine Type:
4-stroke, inline 4-cylinder, direct injection diesel
Bore x Stroke:
N/A - not specified in source data
Compression Ratio:
N/A - not specified in source data
Horsepower Range:
160 to 200 hp depending on model and rating
Aspiration:
Turbocharged; intercooled on 'Z' models
Fuel System:
Direct injection
Cooling:
Freshwater (coolant) with heat exchanger and raw water circuit
Standard Transmission:
Yanmar marine gear (KM series) matched to engine output
Optional Transmission:
Various gear ratios available depending on application
Control:
Mechanical cable or electronic depending on installation
Reduction Ratios:
N/A - dependent on specific marine gear model
Fluid Specification:
Refer to transmission section in manual
Wheelbase:
N/A - not applicable to marine engine
Length:
N/A - varies by model and accessories
Width:
N/A - varies by model and accessories
Height:
N/A - varies by model and accessories
Curb Weight:
N/A - not applicable; refer to dry engine weight in manual
Dry Weight:
N/A - varies by model; see engine specifications
Crash Test Information:
N/A - not applicable to marine engines
Engine Protection:
Overheat, low oil pressure, and overspeed alarms
Emergency Stop:
Manual shutdown via stop solenoid
Enclosure:
Guards on rotating components (where installed)
Corrosion Protection:
Marine-grade coatings and sacrificial anodes
Audio System:
N/A - not applicable to engine; may interface with vessel systems via NMEA
Monitoring:
Digital or analog gauges for RPM, temperature, oil pressure, voltage
Electronic Control:
Mechanical governor standard; electronic options on some variants
Oil Change:
Every 250 hours or annually, whichever comes first
Fuel Filter:
Replace every 250 hours or as indicated
Impeller:
Inspect/replace every 500 hours or annually
Valve Clearance:
Check/adjust every 1000 hours
Engine Oil:
API CF or higher, SAE 15W-40 for typical marine use
Coolant:
Ethylene glycol based, mixed 50/50 with water
Transmission Fluid:
Refer to marine gear manufacturer specifications
Common Wear Items:
Impeller, fuel filters, belts, hoses, anodes
Typical Issues:
Cooling system fouling, fuel contamination, exhaust elbow corrosion
Manufacturer:
Yanmar Co., Ltd., Japan
Reputation:
Long-standing producer of reliable marine diesel engines
Series Introduction:
N/A - specific year not provided
Updates:
Multiple variants introduced to meet different power and emission requirements
Manufacturing:
Yanmar facilities in Japan and other global plants
