Yanmar engines LV series (L48V, L70V, L100V). Manual - part 24

PERIODIC MAINTENANCE

82

LV Operation Manual

Perform the following maintenance every 1000 
hours of operation.

• Check Compression

Check Compression

Checking the engine compression is required 
every 1000 hours to obtain optimum engine 
performance. See your authorized Yanmar 
industrial engine dealer or distributor for this 
service.

Perform the following maintenance every 1500 
hours of operation.

• Inspect, Clean and Test Fuel Injection 

Nozzle

Inspect, Clean and Test Fuel 
Injection Nozzle

Proper operation of the fuel injectors is required 
to obtain the optimum injection pattern for full 
engine performance. The EPA / ARB requires that 
you have the injectors inspected, cleaned and 
tested every 1500 hours. See your authorized 
Yanmar industrial engine dealer or distributor for 
this service.

Every 1000 Hours of Operation

Every 1500 Hours of Operation

A

 WARNING

HIGH PRESSURE HAZARD!

• Avoid skin contact with the high 

pressure diesel fuel spray caused by a 
fuel system leak such as a broken fuel 
injection line. High pressure fuel can 
penetrate your skin and result in 
serious injury. If you are exposed to 
high pressure fuel spray, obtain 
prompt medical treatment.

• NEVER check for a fuel leak with your 

hands. ALWAYS use a piece of wood 
or cardboard. Have your authorized 
Yanmar industrial engine dealer or 
distributor repair the damage.

• Failure to comply could result in death 

or serious injury.

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PERIODIC MAINTENANCE

LV Operation Manual

83

Perform the following maintenance every 2000 
hours of operation.

• Check and Replace Fuel Hoses

Check and Replace Fuel Hoses

Regularly check the fuel system hoses. If they are 
cracked or degraded, replace them. Replace the 
hoses at least every two years, or 2000 hours, 
whichever occurs first. Consult your authorized 
Yanmar industrial engine dealer or distributor to 
replace fuel system hoses.

Every 2000 Hours of Operation

CAUTION

Be environmentally responsible. Follow 
these procedures for hazardous waste 
disposal. Failure to follow these 
procedures may seriously harm the 
environment.

• Follow the guidelines of the EPA or 

other governmental agency for the 
proper disposal of hazardous 
materials such as engine oil, diesel 
fuel and engine coolant. Consult the 
local authorities or reclamation facility.

• NEVER dispose of hazardous 

materials irresponsibly by dumping 
them into a sewer, on the ground or 
into ground water or waterways.

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LV Operation Manual

85

TROUBLESHOOTING

LV Operation Manual

If a problem occurs, stop the engine immediately. 
Refer to the SYMPTOM column in the 
Troubleshooting Chart to identify the problem.

TROUBLESHOOTING CHART

CAUTION

If any indicator fails to illuminate when 
the key switch is in the ON position, see 
your authorized Yanmar industrial 
engine dealer or distributor for service 
before operating the engine.

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CAUTION

If any indicator illuminates during 
engine operation stop the engine 
immediately. Determine the cause and 
repair the problem before you continue 
to operate the engine.

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SYMPTOM

PROBABLE CAUSE

ACTION

REFER TO

Indicator Turns On - Engine Running

Engine oil pressure indicator (If 
equipped)

• Low level of engine oil
• Too high an oil level

• Check and adjust oil level as 

necessary

Checking Engine 

Oil on page 33

• Clogged engine oil filter

• Replace engine oil filter 

element

Replace Engine Oil on 

page 74

Battery Indicator

• Battery failure

• Check battery condition

Check Indicators on 

page 35

• Faulty dynamo

• See authorized Yanmar 

industrial engine dealer or 
distributor

—

Indicator Does Not Turn On - Key Switch is Turned to ON (OFF 

→ ON)

• Faulty electrical wiring or 

faulty indicator

• See authorized Yanmar 

industrial engine dealer or 
distributor

—

TROUBLESHOOTING

86

LV Operation Manual

Indicator Stays On - Key Switch is Turned from Start to ON (START 

→ ON) 

• Battery indicator stays On 

• Faulty alternator

• See authorized Yanmar 

industrial engine dealer or 
distributor

—

• Engine oil pressure indicator 

stays On

• Faulty engine oil pressure 

switch

—

Engine Does Not Start

• Starter motor operates but 

engine does not start

• No diesel fuel

• Refuel fuel system

Filling the Fuel 

Tank on page 30

• Improper diesel fuel

• Replace with recommended 

diesel fuel

Diesel Fuel 

Specifications on 

page 29

• Clogged fuel filter

• Replace fuel filter

Drain the Fuel Tank 

and Replace Outlet 

Fuel Filter on page 79

• Poor fuel injection

• See authorized Yanmar 

industrial engine dealer or 
distributor

—

• Compressed air leakage from 

intake / exhaust valves

—

• Faulty engine stop solenoid (if 

equipped)

—

• Starter motor does not 

operate or rotates too slowly 
(engine can be turned 
manually)

• Battery needs charging

• Check electrolyte, recharge

Check Battery (If 

Equipped) on page 67

• Faulty cable connection at 
• battery terminals

• Clean terminals, retighten

—

• Faulty starter switch

• See authorized Yanmar 

industrial engine dealer or 
distributor

—

• Faulty starter motor

—

• Engine cannot be manually 

turned 

• Inner parts seized or damaged

—

White or Black Exhaust Smoke

• Black exhaust smoke

• Engine overloaded

• Reduce load

—

• Clogged air cleaner element

• Clean element or replace

Clean Air Cleaner 

Element on page 77

• Improper diesel fuel

• Replace with recommended 

diesel fuel

Diesel Fuel 

Specifications on 

page 29

• Faulty spraying of fuel 

injection

• See authorized Yanmar 

industrial engine dealer or 
distributor

—

• Excessive intake / exhaust 

valve clearance

—

SYMPTOM

PROBABLE CAUSE

ACTION

REFER TO