Yanmar 4LH-TE, 4LH-HTE, 4LH-DTE, 4LH-STE Marine Diesel Engine Service Manual
Yanmar Models Covered & Key Technical Specifications
Models: Yanmar 4LH-TE, Yanmar 4LH-HTE, Yanmar 4LH-DTE, Yanmar 4LH-STE
Sub-models / Variants: 4-cylinder, direct injection, turbocharged, turbocharged with air cooler, marine diesel inboard
Model Years: 2000s
Technical Data:
- Engine Configuration: 4-cylinder, vertical 4-cycle water-cooled diesel
- Bore x Stroke: 100 x 110 mm
- Max Output (4LH-STE): 230 HP at 3300 rpm
- Cylinder Head Bolt Torque: 19 kg-m (final stage)
- Engine Oil Capacity: 4.5 L
- Compression Ratio (4LH-STE): 15.2
- Fuel Injection Timing (4LH-STE): 14° ± 1° B.T.D.C.
Yanmar Manual Features & Content Preview
- Covers 4LH-TE, 4LH-HTE, 4LH-DTE, and 4LH-STE primary 2000s marine diesel configurations featuring direct injection and multi-stage turbocharging
- Official Yanmar publication AOA 1030-1, originally printed in Japan
- Documents technical specifications across 398 pages, including 40+ diagrams, exploded-view schematics, and multi-stage torque values
- Provides the precise clearance and assembly data required for a complete engine teardown or routine maintenance
Engine Construction and Systems Overview
This Yanmar 4LH series service manual breaks down the construction and maintenance parameters for four distinct engine variants. You get a thorough look at the basic engine architecture, right down to the cylinder block, liner, and head assemblies. From there, the text dives directly into the fuel injection equipment. It specifically highlights the VE distributor-type pumps and YPES-AL systems. The publication outlines intake and exhaust configurations, alongside lubrication components and cooling circuits utilizing both fresh and sea-water pumps. It also delivers comprehensive chapters on reduction and reversing gears, including the KM5A and HSW630A1 marine gear models, plus remote control installation procedures and full electrical wiring diagrams.
Performance and Technical Data Preview
Inside, you will find the performance curves and torque specifications essential for professional engine overhauls. The manual documents main bearing cap bolt torque at 19 to 21 kg-m, while connecting rod bolt torque is specified strictly at 12 kg-m. Cold valve clearance for the intake sits at 0.1 mm according to the factory tables. Fresh water cooling capacity for the 4LH series is listed at exactly 14 liters. For the 4LH-STE model, turbocharger boost pressure ranges between 1480 and 1800 mmHg at maximum output. Since working with high-pressure marine diesel components involves significant safety risks, a certified marine technician should always verify your final assembly and clearances prior to testing.
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