Yanmar 6LY2-STE, 6LY2A-STP, and 6LYA-STP Marine Diesel Engine 2001 Service Manual (P/N HINSHI-H8-011-1)

• Covers 2001 Models: 6LY2-STE, 6LY2A-STP, and 6LYA-STP vertical water-cooled 4-cycle marine diesels.
• Official OEM Publication: P/N HINSHI-H8-011-1 (1st revised edition, June 2001). This comprehensive 234-page PDF contains the complete factory data.
• Visual Diagnostics: Includes 85 exploded-view diagrams, 3 wiring schematics, and 22 diagnostic tolerance charts, alongside piping diagrams, performance curves, sectional views, dimensional drawings, and system diagrams.
• Core Engine Components: Features specifications for the camshaft and tappets, crankshaft and main bearing, connecting rod assembly, flywheel dimensions, lubrication system, cooling water system, and the intake and exhaust system.
• Auxiliary Systems & Drives: Covers the reduction and reversing gear, remote control installation, starter motor, alternator, fuel feed pump, automatic advancing timer, and the fuel injection nozzle.

Complete System Coverage for the Shop Floor

This factory reference provides the exact specifications needed for professional overhauls and routine maintenance. Rather than generic summaries, it delivers precise data on internal component construction, equipping you with the exact wear limits and clearance standards needed to eliminate trial-and-error and accelerate turnaround times in your bay. You get immediate access to cylinder head assembly details, piston and ring dimensions, and crankshaft bearing clearances. Technical chapters dive directly into the fuel injection pump mechanics, governor maintenance, and the turbocharger cooling system. Electrical system diagnostics are also mapped out to save you troubleshooting time during a complex repair. Please note that this overview describes the manual's contents and reference data; any actual maintenance should always be performed by qualified marine technicians adhering to standard shop safety protocols.

Precision Tolerances and Calibration Data

This document establishes the factory-authorized parameters for your 6LY2. It lists essential torque values, such as the three-stage cylinder head bolt tightening sequence specified at 216–236 Nm (22.0–24.0 kgf·m). You will find exact limits for basic servicing, including 0.1 mm intake and 0.5 mm exhaust valve clearances. It also documents specific fuel injection timing and pump plunger adjustment ranges (1.4–2.6 mm) to ensure proper delivery. For tasks that typically require outsourcing to an expensive specialized shop, the manual outlines detailed step-by-step procedures for valve seat correction, adjusting fuel injection nozzle opening pressure, turbocharger disassembly, and fuel injection timing calibration. Accessing these procedures allows you to confidently execute advanced repairs in-house. For extended service limits and inspection schedules, consult the comprehensive tables included directly in the document.