Part of the Yanmar Repair Manuals.
Run one of these engines out of fuel and you will be hunting bleed screws before it fires again; this book gives you the order. It is Yanmar's own operation manual, publication 49961-205581, covering the 6LYA-STP and 6LY2A-STP marine diesel engines in 58 English pages.
Inside are the procedures owners actually use: supplying fuel and bleeding air, filling lube oil and cooling water, the periodic inspection schedule from the first 50 hours out to the 2000 hour items, the control panel and its warning lamps, long term storage, and the piping and wiring diagrams. These engines are known to be sensitive to coolant make-up, and guessed maintenance is how temperature alarms start; the factory procedure beats a forum thread.
The PDF is bookmarked throughout, so you land on the section you need in two clicks instead of paging through the whole book.
What's Inside This Yanmar 6LYA-STP, 6LY2A-STP Manual
| System | Pages | Key Topics |
|---|---|---|
| Introduction | 3 | - |
| for Safe Operation | 5-8 | Fuel Oil, Lube Oil & Cooling Water |
| Explanation of Product | 9-18 | Use, Driving System Etc., Engine Specifications, Names of Parts, Major Servicing Parts, Control Equipment (Control Panel, Remote Control Handle) |
| Operation | 19-34 | Fuel Oil, Lube Oil & Cooling Water |
| Maintenance & Inspection | 35-47 | Periodic Inspection |
| Troubleshooting | 48-49 | Alarm Buzzer, Alarm Lamps Operation, Engine L.O. Pressure Warning Lamp, Cooling Water Temperature Warning Lamp, Starting Failures, Poor Exhaust Color, Warning Devices Faulty |
| System Diagrams | 50-58 | Piping Diagram, Wiring Diagram |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Fresh water system cleaning/replacement interval (including heat exchanger tank) | Every 2000 service hrs. (or 4 yrs.) | p. 36 |
| Seawater pump impeller replacement interval | Every 2000 hours | p. 46 |
| Impeller replacement interval | Every 2000 hours | p. 45 |
| Recommended Battery Capacity | 12V×120Ah | p. 10 |
| Low Idling Speed | 700±25 rpm | p. 10 |
Yanmar 6LYA-STP, 6LY2A-STP Common Problems This Manual Covers
Overheating under load
Owners report these engines are sensitive to coolant make-up, and a wrong mix or low level shows up as a temperature alarm when you push the throttle. The manual's cooling water procedure covers filling the fresh water system correctly before it becomes a problem.
Manual Section: Supplying Cooling Water p. 22Worn seawater pump impeller
A tired impeller starves the seawater side and overheats the engine long before anything else fails. The manual calls for impeller replacement every 2000 hours and walks through it in the 2000 hour inspection items.
Manual Section: Inspection Every 2000 Hrs. p. 44Air in the fuel system
Run a tank dry or change a filter and the engine will crank without firing until the air is out. The manual gives the fuel supply and air bleeding procedure step by step.
Manual Section: Supplying Fuel and Bleeding Air in the Fuel System p. 20Alarm buzzer with no obvious cause
An alarm at the helm tells you something is wrong but not what. The troubleshooting chart works through the buzzer, the lube oil pressure and cooling water temperature warning lamps, starting failures, poor exhaust color, and faulty warning devices.
Manual Section: Troubleshooting p. 46Slack or cracked alternator V-belt
A loose belt shows up as a battery that will not hold charge and a squeal at start-up. Belt checks sit in the periodic inspection items along with the rest of the hour-based service schedule.
Manual Section: Periodic Inspection Items p. 36Hard starting after winter lay-up
An engine that sat for months needs more than a fresh battery. The manual covers starting after storage or on a new engine, and its long term storage procedure keeps the next lay-up from causing the same trouble.
Manual Section: Starting After Storage or New Engine p. 23Frequently Asked Questions
Which engines does this manual cover?
It covers the Yanmar 6LYA-STP and 6LY2A-STP marine diesel engines. This is the factory operation manual, Yanmar publication 49961-205581, written in English across 58 pages.
Does it include wiring and piping diagrams?
Yes. The System Diagrams section closes the book with a full piping diagram and a wiring diagram, useful when you are tracing a cooling line or chasing an electrical fault back from the control panel. p. 48
Does it give a maintenance schedule?
Yes. The Periodic Inspection Items section runs from the initial 50 hour inspection out to the 2000 hour items, which include cleaning the fresh water system and heat exchanger and replacing the seawater pump impeller. p. 36
What do I do when a warning lamp comes on?
Start with the Troubleshooting section. It covers the alarm buzzer, the engine lube oil pressure and cooling water temperature warning lamps, starting failures, poor exhaust color, and faulty warning devices, and points you to the fix for each. p. 46
What format is this manual in?
Immediate download of the complete 58-page searchable OPERATION MANUAL. Access it on any device, from a laptop at your desk to a phone in the field.
Can I print just the pages I need from this manual?
Yes. The PDF has no DRM restrictions, so print any page or section you need for your shop. Works with any standard printer.
Are electrical wiring diagrams included in this Yanmar 6LYA-STP manual?
Yes. You'll find an electrical wiring diagram covering the main wiring layout.
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