Yanmar engines LV series (L48V, L70V, L100V). Manual - part 23

PERIODIC MAINTENANCE

78

LV Operation Manual

The engine performance is adversely affected 
when the air cleaner element is clogged with 
dust. Be sure to clean the air filter element 
periodically.

1. Remove the wing nut (Figure 7, (1)). 

2. Remove the air cleaner cover (Figure 7, (2)).

Figure 7

3. Remove the wing nut (Figure 7, (3)). 

4. Remove the air cleaner element 

(Figure 7, (4)) and outer foam element 
(Figure 7, (5)).

5. Blow air through both elements using 42-71 

psi (0.29

−0.49MPa, 3.0−5.0kgf/cm

2

) 

compressed air to remove the particulates. 
Use the lowest possible air pressure to 
remove the dust without damaging the 
elements.

6. If either element is damaged replace both of 

them (they are not sold individually).

7. Clean the inside of the air cleaner cover 

(Figure 7, (2)).

8. Install the air cleaner element (Figure 7, (4)) 

into the air cleaner case.

9. Slide the outer foam element (Figure 7, (5)) 

over the air cleaner element (Figure 7, (4)).

10. Install the wing nut (Figure 7, (3)) and hand 

tighten. Overtightening the wing nut will 
damage the air cleaner assembly.

11. Install the air cleaner cover (Figure 7, (2)).

12. Install the wing nut (Figure 7, (1)) and hand 

tighten. Overtightening the wing nut will 
damage the air cleaner assembly.

Replace Engine Oil and Clean / 
Inspect Engine Oil Filter

Applicable Air Cleaner Element Part No.

L48V

114250-12581

L70V and L100V

114210-12590

0001549A

(1)

(2)

(4)

(5)

(3)

CAUTION

• Only use the engine oil specified. 

Other engine oils may affect warranty 
coverage, cause internal engine 
components to seize, or shorten 
engine life.

• Prevent dirt and debris from 

contaminating the engine oil. Carefully 
clean the oil cap / dipstick and the 
surrounding area before you remove 
the cap.

• NEVER mix different types of engine 

oil. This may adversely affect the 
lubricating properties of the engine oil.

• NEVER overfill. Overfilling may result 

in white exhaust smoke, engine 
overspeed or internal damage.

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PERIODIC MAINTENANCE

LV Operation Manual

79

Change the engine oil every 200 hours of 
operation after the initial change at 50 hours. 
Clean and inspect the engine oil filter at the same 
time. See Replace Engine Oil on page 74.

Check Engine Speed Control 

After you operate the engine for 200 hours, check 
the engine speed control. See the instructions for 
your driven machine for proper adjustments.

1. Check the engine speed control for smooth 

operation and lubricate or clean as 
necessary.

2. Check engine speed control for proper 

adjustments.

Drain the Fuel Tank and Replace 
Outlet Fuel Filter

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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A

 DANGER

FIRE AND EXPLOSION HAZARD!

• Diesel fuel is extremely flammable and 

explosive under certain conditions.

• When you remove any fuel system 

component to perform maintenance 
(such as changing the fuel filter) place 
an approved container under the 
opening to catch the fuel.

• NEVER use a shop rag to catch the 

fuel. Vapors from the rag are extremely 
flammable and explosive.

• Wipe up any spills immediately.

• Wear eye protection. The fuel system 

is under pressure and fuel could spray 
out when you remove any fuel system 
component.

• Failure to comply will result in death or 

serious injury.

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PERIODIC MAINTENANCE

80

LV Operation Manual

1. Position an approved container under the fuel 

tank to collect the fuel.

2. Remove the fuel cap (Figure 8, (1)).

3. Remove the fuel tank drain plug 

(Figure 8, (2)) and gasket (Figure 8, (3)) to 
drain the fuel.

Figure 8

4. Loosen the fuel cock nuts (Figure 9, (1)) on 

either side of the fuel cock (Figure 9, (2)). 

5. Remove and discard the O-ring 

(Figure 9, (3)).

6. Pull the outlet fuel filter (Figure 9, (4)) and 

gasket (Figure 9, (5)) out of the fuel tank filler 
port (Figure 9, (6)).

Figure 9

7. Install a new outlet fuel filter (Figure 9, (4)) 

and gasket (Figure 9, (5)) through the fuel 
tank filler port (Figure 9, (6)) and seat in the 
fuel tank.

8. Install a new O-ring (Figure 9, (3)) on the fuel 

cock (Figure 9, (2)) and fasten the assembly 
to the fuel tank using the fuel cock nuts 
(Figure 9, (1)). 

9. Tighten the fuel tank drain plug (Figure 8, (2)) 

with new gasket (Figure 8, (3)).

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.

0000013en

0001569A

(1)

(2)

(3)

Applicable Outlet Fuel Filter Part No.

L48V, L70V and L100V

114250-55121

Applicable O-Ring Part No.

L48V, L70V and L100V

24341-000150

(3)

(5)

(4)

(2)

(1)

0001568A

(6)

PERIODIC MAINTENANCE

LV Operation Manual

81

10. Replace the fuel cap (Figure 8, (1)) and hand 

tighten. Overtightening the fuel cap will 
damage it. Refill fuel tank. See Filling the Fuel 
Tank on page 30. 

Perform the following maintenance every 400 
hours of operation.

• Adjust Intake and Exhaust Valve Clearance

Adjust Intake and Exhaust Valve 
Clearance

Proper operation of the intake and exhaust valves 
is required to obtain optimum engine 
performance. See your authorized Yanmar 
industrial engine dealer or distributor for this 
service.

Every 400 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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