Covering every inch of the 2006 marine diesel block, this 366-page Yanmar 6LY3-ETP, 6LY3-STP, 6LY3-UTP Service Manual PDF (OEM #0BLY3-G00100) breaks down complete teardown and rebuild procedures. Inside, you get full electrical wiring diagrams, complete diagnostic trouble code charts, and step-by-step disassembly steps for the entire fuel injection equipment system. Open up a massive troubleshooting section detailing ECU pin configurations, temperature sensor diagnostics, and precise periodic maintenance schedules. Verify your intake valve guide inside diameter is sitting between 8.010 and 8.025 mm, then torque the new cylinder head bolts in three stages up to 236 N-m. Don't let an engine fault keep your boat tied to the dock. Grab this bookmarked download, open it on your tablet in the engine room, and get the repair done right the first time.
What's Inside This Yanmar 6LY3-ETP, 6LY3-STP, 6LY3-UTP Manual
| System | Pages | Key Topics |
|---|---|---|
| General | 21-35 | Exterior Views, Main Specifications, Fuel Oil, Lubricating Oil and Cooling Water, Engine Outline, Piping Diagrams |
| Inspection and Adjustment | 36-75 | Periodic Maintenance Schedule |
| Troubleshooting | 76-148 | Preparation Before Troubleshooting, Trouble Code |
| Disassembly and Reassembly | 149-186 | Disassembly and Reassembly Precautions, Disassembly and Reassembly Tools |
| Inspection and Servicing of Basic Engine Parts | 187-227 | Cylinder Block, Cylinder Head, Piston and Piston Pins, Connecting Rod, Crankshaft and Main Bearing, Camshaft and Tappets, Timing Gear |
| Fuel Injection Equipment | 228-265 | Fuel Injection Pump / Governor / Timer, Fuel Injection Nozzle, Fuel Feed Pump, Fuel Filter, Electronic Control System |
| Intake and Exhaust System | 266 | Intake System, Exhaust System |
| Lubrication System | 267-275 | Lube Oil Pump, Lube Oil Filter, Lube Oil Cooler, Rotary Waste Oil Pump (Optional) |
| Cooling Water System | 276-300 | Seawater Pump, Fresh Water Pump, Heat Exchanger, Pressure Cap and Coolant Recovery Tank, Thermostat, Seacock (Optional) |
| Turbocharger | 301-323 | Construction and Function, Standards for Maintenance and Check, Periodical Checking Procedure, Disassembly Procedure, Cleaning and Checking Procedure |
| Reduction and Reversing Gear | 324 | - |
| Remote Control | 325-330 | Electronic Control System (Ecs) |
| Electrical System | 331-357 | Battery, Starting Motor, Alternator Standard, 12V/80A, Warning Devices, Air Heater, Fuse |
| Service Standards | 358-363 | Engine Tuning, Engine Body |
| Tightening Torque for Bolts and Nuts | 364-366 | Main Bolt and Nut, Standard Bolts and Nuts (Without Lube Oil) |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Cylinder head bolt tightening torque (New bolt) | 1st: 118 N•m (12.0 kgf•m), 2nd: 177 N•m (18.0 kgf•m), 3rd: 216-236 N•m (22.0-24.1 kgf•m) | p. 364 |
| Cylinder head bolt tightening torque (Used bolt) | 1st: 108 N•m (11.0 kgf•m), 2nd: 167 N•m (17.0 kgf•m), 3rd: 196-216 N•m (20.0-22.0 kgf•m) | p. 364 |
| Fuel nozzle sleeve tightening torque | 52.9-62.7 N•m (5.4-6.4 kgf•m) | p. 364 |
| Nozzle fastening bolt tightening torque | 29.4-33.4 N•m (3.0-3.4 kgf•m) | p. 364 |
| Intake valve guide inside diameter (Standard) | 8.010-8.025 mm | p. 359 |
| Intake valve guide inside diameter (Limit) | 8.1 mm | p. 359 |
| Nozzle opening pressure (No.1 press.) | 24.00-24.98 MPa (245-255 kgf/cm2) | p. 250 |
| Nozzle opening pressure (No.2 press.) | 36.96-38.34 MPa (377-391 kgf/cm2) | p. 250 |
| General replacement instruction for gaskets and O-rings | Replace all gaskets and O-rings. | p. 149 |
| Lube oil filter (full flow) rubber packing tightening | After touching rubber packing, turn additional 3/4 of a turn. | p. 364 |
| Engine Displacement | 5.813 l | p. 22 |
| Low Idling Speed | 700±25 min-1 | p. 22 |
Yanmar 6LY3-ETP, 6LY3-STP, 6LY3-UTP Common Problems This Manual Covers
Yanmar 6LY3-ETP engine control and instrument functions drop out while underway with total loss of throttle
Inspect the CANBUS connectors and engine control system wiring harness for loose pins or corrosion. Review the error code reference for ECU communication faults. Clear any active codes and verify the low idling speed stabilizes at 700±25 min-1.
Manual Section: Diagnostic Trouble Code (DTC) AnalysisHeavy ticking noise from cylinder head under load with excessive oil consumption and lower end knocking p. 359
Measure the intake valve guide inside diameter to confirm it is within the 8.010-8.025 mm standard shown on page 359. Check the intake valve guide clearance on page 196, replacing components if it exceeds 0.035-0.065 mm to prevent further internal wear.
Manual Section: 5. Inspection and Servicing of Basic Engine PartsEngine runs unevenly under load and emits dense whitish exhaust smoke with noticeable power drop p. 250
Remove the fuel injection nozzles and test the primary opening pressure. Verify the pressure reaches 24.00-24.98 MPa (245-255 kgf/cm2) as specified on page 250. Clean or replace the nozzle assembly if the spray pattern is distorted or fails to hold pressure.
Manual Section: Fuel Injection Pump TroubleshootingChronic coolant loss and overheating requiring frequent teardowns around six hundred operating hours p. 175
Remove the cylinder head and inspect the sealing surfaces. Install a new gasket with the exact 1.3 mm thickness specified on page 175. Torque the new cylinder head bolts in three stages, finishing at 216-236 N.m as detailed on page 364.
Manual Section: 4. Disassembly and ReassemblyFrequently Asked Questions
How do I reset the alarm on a YANMAR 6LY3-ETP?
For specific Diagnostic Trouble Codes (DTCs) such as P0219/0 (Engine Over Rev.), P1210/4 (Rack Actuator), P1211/7 (Rack Actuator Mechanical Malfunction), and P0605/12 (EEPROM Error), the manual states that resetting the fail mode requires turning the key off. For other alarms, the manual mentions an 'Alarm Log screen' with a 'CLR' button, which likely clears the log rather than resetting an active alarm.
How do I clear error codes on a YANMAR 6LY3-STP?
For certain Diagnostic Trouble Codes (DTCs), such as P0219/0 (Engine Over Rev.), P1210/4 (Rack Actuator), P1211/7 (Rack Actuator Mechanical Malfunction), and P0605/12 (EEPROM Error), the fail mode can be reset by turning the key off. Additionally, the manual suggests that clearing DTC information may be easier using a service tool, especially for logged DTCs that are not currently active.
What does the YANMAR 6LY3-UTP warning light mean?
The TELEFLEX i5501E Display shows various alarm messages when a trouble occurs, such as "HOT ENGINE", "OVER REV", "OIL PRESSURE", "TURBO BOOST", "GEAR OIL", "ENG COM ERROR", "MAINTENANCE", "NETWORK", "PWR REDUCTION", "NEUTRAL PROTECTION", "CHECK ENGINE", "EMERGENCY STOP", "LOW VOLTAGE", "ALTERNATOR", "SEA WATER FLOW", "LOW COOLANT", "WATER IN FUEL", "MAIN THROTTLE", "SEC THROTTLE", and "SHUTTING DOWN". Specific Diagnostic Trouble Codes (DTCs) like P0115 for "Water Temperature Sensor" or P0118 for "Water temperature Too High" also indicate specific issues.
How do I troubleshoot a YANMAR 6LY3 electronic control fault?
To troubleshoot an electronic control fault, refer to the "Trouble code" section which lists Diagnostic Trouble Codes (DTCs) with their descriptions, probable causes, and corrective actions. For example, a P0115/3 code indicates an open circuit in the water temperature sensor wire-harness or a sensor/ECU failure, with a corrective action to follow the "Temperature Sensor Diagnosis Procedure".
What do I get after purchasing this Yanmar 6LY3-ETP, 6LY3-STP, 6LY3-UTP manual?
This is a 366-page searchable PDF ready for immediate download. Works on any device, so pull it up on your phone while you're under the hood. No shipping, no waiting.
Is this Yanmar 6LY3-ETP, 6LY3-STP, 6LY3-UTP Service Manual printable?
Absolutely. No DRM or copy protection. Print the whole manual or just the pages you need. Any home or office printer works.
Does this manual have electrical diagrams?
Included. The Yanmar 6LY3-ETP, 6LY3-STP, 6LY3-UTP Service Manual covers complete wiring harness diagrams, electrical circuits, and connector pinouts.
Document Quality
This document is a scanned PDF with an OCR text layer, allowing you to search and copy the full text. The text throughout is crisp and consistently easy to read. Diagrams and illustrations are raster images; while generally clear and readable, some fine lines and small text in complex diagrams may appear slightly blurry when zoomed in. Pages are clean with no notable scan artifacts, stains, or skewed content.
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