Yanmar L70N User Manual (English)

Questions and Answers:

S
srhodesAug 13, 2025
What to do if my Yanmar L70N does not start?
- P
  Patrick BarnesAug 13, 2025
  If the Yanmar Engine does not start, it could be due to several reasons. You might be out of diesel fuel, in which case you should refuel the system. Alternatively, the diesel fuel you're using might be improper, so replace it with the recommended type. A clogged fuel filter could also be the culprit, so try replacing it. If none of these solutions work, the issue might be poor fuel injection, and you should consult an authorized Yanmar industrial engine dealer or distributor.
J
Jennifer KellerAug 16, 2025
What to do if Yanmar L70N Engine starter motor operates but engine does not start?
- J
  John WilliamsAug 16, 2025
  If the starter motor operates but the Yanmar engine does not start, consider these possibilities: there might be no diesel fuel, so refuel the fuel system; the diesel fuel might be improper, so replace it with the recommended type; or the fuel filter might be clogged, so replace the fuel filter. If the problem persists, it could be poor fuel injection, and you should consult an authorized Yanmar industrial engine dealer or distributor.
J
John RamirezAug 20, 2025
Why does my Yanmar L70N Engine emit white exhaust smoke?
- S
  Shari ColemanAug 20, 2025
  If you observe white exhaust smoke from your Yanmar Engine, it might be because of improper diesel fuel. Replacing it with the recommended diesel fuel may resolve the issue.
C
cynthiafernandezAug 25, 2025
Why is my Yanmar L70N producing white or black exhaust smoke?
- M
  Michael KennedyAug 25, 2025
  If your Yanmar Engine is producing white or black exhaust smoke, there could be several reasons. If the smoke is black, try reducing the load on the engine. It could also be due to a clogged air cleaner element, so try cleaning or replacing it. Finally, improper diesel fuel might be the cause, so replace it with the recommended diesel fuel.
J
Jean Long MDAug 28, 2025
Why indicator stays on Yanmar L70N Engine after turning key switch from start to on?
- J
  Jeff BrownAug 28, 2025
  If the indicator light on your Yanmar Engine stays on even after you've turned the key switch from Start to ON, it could be due to a faulty alternator. In this case, you should seek assistance from an authorized Yanmar industrial engine dealer or distributor.
J
Jose FoxAug 31, 2025
Why is the indicator turning on when my Yanmar L70N Engine is running?
- S
  sarahrossSep 1, 2025
  If the indicator turns on while the Yanmar Engine is running, it could be due to a low or too high engine oil level, so check and adjust the oil level as necessary. Another possible cause is a clogged engine oil filter; if so, replace the engine oil filter element.
E
Emily MyersSep 4, 2025
What to do if indicator does not turn on Yanmar L70N Engine when key switch is on?
- D
  Daniel DrakeSep 4, 2025
  If the indicator does not turn on when the key switch is turned to ON on your Yanmar Engine, it could be due to faulty electrical wiring or a faulty indicator. In this case, you should consult an authorized Yanmar industrial engine dealer or distributor.
W
Wendy DavisSep 8, 2025
What to do if there is a problem with the battery indicator on Yanmar L70N?
- S
  Shannon GarciaSep 8, 2025
  If you are experiencing issues with the battery indicator on your Yanmar Engine, it could be due to battery failure, in which case you should check the battery condition. Alternatively, it might be a faulty dynamo, and you should consult an authorized Yanmar industrial engine dealer or distributor.

Yanmar L70N Specifications

General

Brand	Yanmar
Model	L70N
Category	Engine
Language	English

Summary

INTRODUCTION

RECORD OF OWNERSHIP

Details for recording engine ownership for service and literature.

YANMAR WARRANTIES

YANMAR LIMITED WARRANTY

Details coverage, duration, and owner's responsibilities for the warranty.

To Locate an Authorized Yanmar Industrial Engine Dealer or Distributor

Guidance on finding official Yanmar service locations via website.

What Yanmar Will Do

Explains Yanmar's commitment to repairs and replacements under warranty.

What is Not Covered by this Warranty

Lists exclusions from warranty coverage, such as damage from misuse or wear.

Warranty Limitations

Outlines limitations on warranty claims, including consequential damages.

Warranty Modifications

States that the written warranty is the complete agreement and cannot be modified.

Questions

Provides contact information for warranty-related inquiries.

Retail Purchaser Registration

Emphasizes the importance of registering the product for Yanmar support.

SAFETY

SAFETY STATEMENTS

Explains hazard alert symbols (DANGER, WARNING, CAUTION) and their meanings.

SAFETY PRECAUTIONS

Lists general safety rules and precautions for operating the engine.

PRODUCT OVERVIEW

YANMAR L-N SERIES ENGINE FEATURES AND APPLICATIONS

Highlights key features and common applications for Yanmar L-N series engines.

COMPONENT IDENTIFICATION

Identifies major engine components with a diagram and numbered list.

LOCATION OF LABELS

Shows the placement of regulatory and safety labels on the engine.

FUNCTION OF MAJOR ENGINE COMPONENTS

Details the functions of various engine parts in a table format.

AIR COOLED ENGINE

Describes the air-cooling mechanism of the L-N series engines.

CONTROLS - RECOIL STARTER

Explains the operation of the manual recoil starter system.

INDICATORS AND CONTROLS – ELECTRIC STARTER

Describes indicators and controls for engines equipped with electric start.

Indicators

Explains the function of battery and heat indicators.

Controls

Details the controls for engine operation, including the key switch.

Inlet Air Heater

Describes the function of the inlet air heater for cold weather starting.

Engine Speed Controls

Explains how to adjust engine speed using various control types.

BEFORE YOU OPERATE

Diesel Fuel

Specifies requirements and guidelines for using diesel fuel, including bio-diesel.

Filling the Fuel Tank

Provides instructions and safety warnings for refueling the engine.

ENGINE OIL

Outlines specifications and guidelines for engine oil selection and use.

Engine Oil Specifications

Lists recommended API, ACEA, and JASO service categories for engine oil.

Checking Engine Oil

Details the procedure for checking the engine oil level.

Adding Engine Oil

Explains how to add engine oil and check the level.

Engine Oil Capacity (Typical)

Provides typical engine oil capacities for different L-N models.

DAILY CHECKS

Lists essential checks to perform before starting the engine.

Visual Checks

Details specific visual checks for leaks, parts, fasteners, and connections.

Check Diesel Fuel and Engine Oil

Guides on checking fuel and engine oil levels.

Check Engine Speed Control (First Time Only)

Initial checks for the engine speed control system.

Check Indicators

Explains how to check various engine indicators.

ENGINE OPERATION

STARTING THE ENGINE

Outlines procedures for starting the engine using recoil or electric start.

Start The Engine

Detailed steps for successfully starting the engine.

In Cold Weather - L48N Only

Specific procedure for starting an L48N engine in cold weather.

Electric Start

Instructions for starting the engine using an electric starter.

Set Engine Speed Control to START

Additional guidance on setting speed controls for starting.

CHECK THE ENGINE DURING OPERATION

Procedures for monitoring the engine while it is running.

ADJUST ENGINE SPEED

How to adjust engine speed for different tasks.

SHUTTING DOWN THE ENGINE

Procedures for safely stopping the engine.

Preparing To Stop Engine

Steps to follow before turning off the engine.

Set Engine Speed Control to STOP

Instructions for setting the speed control to the stop position.

After The Engine Stops

Actions to take after the engine has stopped.

PERIODIC MAINTENANCE

PRECAUTIONS

General precautions and importance of periodic maintenance.

Tightening Fasteners

Guidelines for correctly tightening fasteners using specified torque.

STANDARD TORQUE CHART

Provides torque values for various fastener sizes.

PERIODIC MAINTENANCE SCHEDULE

Summarizes maintenance tasks at different operating hour intervals.

PERIODIC MAINTENANCE PROCEDURES

Details daily maintenance tasks to be performed before operation.

Daily, Before Operation

Lists checks to be done before starting the engine daily.

Check Battery (If Equipped)

Procedure for checking the battery status.

Check Battery Indicator (If Equipped)

How to check the battery indicator light.

Check Engine Oil Level

Steps to check the engine oil level.

Check For Engine Oil Leakage

Procedure to check for engine oil leaks.

Check Engine Speed Control (First Time Only)

Initial checks for the engine speed control system.

Check Spark Arrestor (If Equipped)

Instructions for cleaning the spark arrestor.

Check Fuel Level

How to check the engine's fuel level.

Check For Fuel Leakage

Procedure to check for fuel leaks.

Daily, After Operation

Maintenance tasks to perform after the engine has been operated.

Check For Engine Oil Leakage

Checks for oil leaks after operation.

TROUBLESHOOTING

TROUBLESHOOTING CHART

A guide to diagnosing engine problems based on symptoms.

TROUBLESHOOTING INFORMATION

Advice on what information to provide when consulting for troubleshooting.

LONG TERM STORAGE

BEFORE YOU PLACE THE ENGINE IN LONG TERM STORAGE

Procedures for preparing the engine for extended storage.

RETURNING THE ENGINE TO SERVICE

Steps to follow to put the engine back into service after storage.

SPECIFICATIONS

GENERAL

Basic information about model numbering and engine speed.

Description of Model Number

Explanation of the coding system used in Yanmar engine model numbers.

Engine Speed Specifications

Lists engine speed ranges and their intended uses.

Engine General Specifications

Provides general technical details about the engine type and systems.

PRINCIPAL ENGINE SPECIFICATIONS

Detailed technical specifications for L48N, L70N, and L100N engines.

Related product manuals

Yanmar L70N User Manual

Table of Contents

Questions and Answers:

Yanmar L70N Specifications

Summary

INTRODUCTION

RECORD OF OWNERSHIP

YANMAR WARRANTIES

YANMAR LIMITED WARRANTY

To Locate an Authorized Yanmar Industrial Engine Dealer or Distributor

What Yanmar Will Do

What is Not Covered by this Warranty

Warranty Limitations

Warranty Modifications

Questions

Retail Purchaser Registration

SAFETY

SAFETY STATEMENTS

SAFETY PRECAUTIONS

PRODUCT OVERVIEW

YANMAR L-N SERIES ENGINE FEATURES AND APPLICATIONS

COMPONENT IDENTIFICATION

LOCATION OF LABELS

FUNCTION OF MAJOR ENGINE COMPONENTS

AIR COOLED ENGINE

CONTROLS - RECOIL STARTER

INDICATORS AND CONTROLS – ELECTRIC STARTER

Indicators

Controls

Inlet Air Heater

Engine Speed Controls

BEFORE YOU OPERATE

Diesel Fuel

Filling the Fuel Tank

ENGINE OIL

Engine Oil Specifications

Checking Engine Oil

Adding Engine Oil

Engine Oil Capacity (Typical)

DAILY CHECKS

Visual Checks

Check Diesel Fuel and Engine Oil

Check Engine Speed Control (First Time Only)

Check Indicators

ENGINE OPERATION

STARTING THE ENGINE

Start The Engine

In Cold Weather - L48N Only

Electric Start

Set Engine Speed Control to START

CHECK THE ENGINE DURING OPERATION

ADJUST ENGINE SPEED

SHUTTING DOWN THE ENGINE

Preparing To Stop Engine

Set Engine Speed Control to STOP

After The Engine Stops

PERIODIC MAINTENANCE

PRECAUTIONS

Tightening Fasteners

STANDARD TORQUE CHART

PERIODIC MAINTENANCE SCHEDULE

PERIODIC MAINTENANCE PROCEDURES

Daily, Before Operation

Check Battery (If Equipped)

Check Battery Indicator (If Equipped)

Check Engine Oil Level

Check For Engine Oil Leakage

Check Engine Speed Control (First Time Only)

Check Spark Arrestor (If Equipped)

Check Fuel Level

Check For Fuel Leakage

Daily, After Operation

Check For Engine Oil Leakage

TROUBLESHOOTING

TROUBLESHOOTING CHART

TROUBLESHOOTING INFORMATION

LONG TERM STORAGE

BEFORE YOU PLACE THE ENGINE IN LONG TERM STORAGE

RETURNING THE ENGINE TO SERVICE

SPECIFICATIONS