Model Variants:
4LHA-DT, 4LHA-HT, 4LHA-STP, 4LHA-DTP, 4LHA-STE, 4LHA-DTE
Production Years:
Covered for all model years
Generation:
N/A - not applicable to marine diesel engines
Manual Type:
Service Manual
Delivery:
Instant download
Target Audience:
Marine technicians, boat owners, and DIY mechanics
Application:
Yanmar 4LHA series marine diesel engines used in pleasure craft, commercial vessels, and auxiliary power units
Engine Design:
Inline 4-cylinder, water-cooled diesel
Fuel System:
Direct injection
Aspiration:
Naturally aspirated and turbocharged variants available
Cooling:
Freshwater cooling with heat exchanger
Comprehensive Coverage:
Includes fuel injection, lubrication, cooling, intake/exhaust, electrical, and reduction/reversing gear
Step-by-Step Procedures:
Detailed instructions for maintenance, repair, and overhaul
OEM Specifications:
Factory tolerances, torque values, and diagnostic information
Manual Type:
Service Manual
Page Count:
Unknown - not specified
Delivery Method:
Instant download
Covered Systems:
Fuel Injection, Lubrication, Cooling, Intake/Exhaust, Electrical, Reduction/Reversing Gear, Remote Control
Operating System:
Windows & Mac (All Versions)
Software:
Adobe PDF Reader
Fuel System:
Injection pump, injectors, fuel filter, lines
Lubrication System:
Oil pump, oil filter, cooler, pressure regulation
Cooling System:
Seawater pump, freshwater pump, heat exchanger, thermostat
Intake and Exhaust:
Air filter, turbocharger (if equipped), exhaust manifold, mixing elbow
Electrical System:
Alternator, starter motor, wiring, sensors, gauges
Reduction/Reversing Gear:
Transmission, clutch, controls
Remote Control:
Throttle and shift controls
Maintenance:
Scheduled service, fluid changes, filter replacement
Diagnostics:
Troubleshooting charts, fault codes (if applicable)
Repair:
Component removal, inspection, and installation
Overhaul:
Engine disassembly, measurement, and reassembly
Adjustments:
Valve clearance, injection timing, belt tension
Specifications:
Torque values, clearances, wear limits
Diagrams:
Exploded views, schematics, flow charts
Tools:
Special tools and equipment required
Part Numbers:
OEM part numbers for replacement components
Ordering:
Guidance on sourcing 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:
Inline 4-cylinder diesel
Displacement:
2.37 liters (for 4LHA-DT and 4LHA-HT variants)
Bore x Stroke:
84 mm x 90 mm (typical for 2.37L)
Compression Ratio:
21.0:1 (typical)
Power Output:
Varies by model, typically 100-130 HP range
Rated Speed:
3600 RPM (typical)
Injection Pump:
Bosch type, mechanical
Cooling Method:
Water-cooled
Lubrication Method:
Forced lubrication (wet sump)
Oil Capacity:
Refer to manual for specific capacity
Wheelbase:
N/A - not applicable to marine engines
Length:
Refer to manual for specific dimensions
Width:
Refer to manual for specific dimensions
Height:
Refer to manual for specific dimensions
Curb Weight:
N/A - not applicable, refer to dry weight in manual
Dry Weight:
Approximately 250 kg (typical for 4LHA series)
Engine Protection:
Low oil pressure alarm, high coolant temperature alarm
Shutdown System:
Optional automatic shutdown
Guards:
Belt guards, heat shields
Certifications:
Complies with applicable marine safety standards
Crash Test Information:
N/A - not applicable to marine engines
Service Interval:
Detailed in manual
Oil Change:
Every 250 hours or annually (typical)
Filter Replacement:
Details provided in manual
Oil Capacity:
Refer to manual for specific capacity
Recommended Oil Type:
Refer to manual (typically API CF or higher)
Coolant:
Refer to manual for specification
Common Wear Items:
Impellers, belts, hoses, filters
Diagnostic Tools:
Information on necessary tools for diagnosis
