Yanmar engines LV series (L48V, L70V, L100V). Manual - part 19

PERIODIC MAINTENANCE

62

LV Operation Manual

CAUTION

• When the engine is operated in dusty 

conditions, clean the air cleaner 
element more frequently.

• NEVER operate the engine with the air 

cleaner or element(s) removed.  This 
may cause foreign material to enter the 
engine and damage it.

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CAUTION

The maximum air intake restriction shall 
be:

• L48V: 0.10 psi (0.69 kPa; 70 mm Aq) or 

less

• L70V: 0.20 psi (1.37 kPa; 140 mm Aq) 

or less

• L100V: 0.21 psi (1.47 kPa; 150 mm Aq) 

or less. 

Clean or replace the air cleaner element 
if the air intake restriction exceeds the 
above mentioned value.

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CAUTION

The tightening torque in the Standard 
Torque Chart (page 64) should be 
carefully observed.

• Apply 60% torque to bolts that are not 

listed. 

• Apply 80% torque when tightened to 

aluminum alloy.

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PERIODIC MAINTENANCE

LV Operation Manual

63

PRECAUTIONS

The Importance of Periodic 
Maintenance

Engine deterioration and wear occurs in 
proportion to length of time the engine has been 
in service and the conditions the engine is subject 
to during operation. Periodic maintenance 
prevents unexpected downtime, reduces the 
number of accidents due to poor machine 
performance and helps extend the life of the 
engine. 

Performing Periodic Maintenance

Perform periodic maintenance procedures in an 
open, level area free from traffic. If possible, 
perform the procedures indoors to prevent 
environmental conditions, such as rain, wind, or 
snow, from damaging the machine.

The Importance of Daily Checks

Periodic Maintenance Schedules assume that the 
daily checks are performed on a regular basis. 
Make it a habit of performing daily checks before 
the start of each shift. See Daily Checks on 
page 34.

Keep a Log of Engine Hours and 
Daily Checks

Keep a log of the number of hours the engine is 
run each day and a log of the daily checks 
performed. Also note the date, type of repair 
(e.g., replaced alternator), and parts needed for 
any service needed between the periodic 
maintenance intervals. Periodic maintenance 
intervals are every 50, 200, 400, 1000, 1500 and 
2000 engine hours. Failure to perform periodic 
maintenance will shorten the life of the engine.

Yanmar Replacement Parts

Yanmar recommends that you use genuine 
Yanmar parts when replacement parts are 
needed. Genuine replacement parts help ensure 
long engine life.

Tools Required

Before you start any periodic maintenance 
procedure make sure you have the tools you 
need to perform all of the required tasks.

Ask Your Authorized Yanmar 
Industrial Engine Dealer or 
Distributor For Help

Our professional service technicians have the 
expertise and skills to help you with any 
maintenance or service related procedures you 
need help with.

A

 WARNING

EXHAUST HAZARD!

• NEVER operate the engine in an 

enclosed area such as a garage, 
tunnel, underground room, manhole or 
ship’s hold without proper ventilation. 

• NEVER block windows, vents, or other 

means of ventilation if the engine is 
operating in an enclosed area. All 
internal combustion engines create 
carbon monoxide gas during 
operation. Accumulation of this gas 
within an enclosure could cause 
illness or even death.

• Make sure that all connections are 

tightened to specifications after repair 
is made to the exhaust system.

• Failure to comply could result in death 

or serious injury.

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PERIODIC MAINTENANCE

64

LV Operation Manual

Required EPA / ARB Maintenance - 
USA Only

To maintain optimum engine performance and 
compliance with the Environmental Protection 
Agency (EPA) Regulations Non-road Engines 
and the California Air Resources Board (ARB, 
California), it is essential that you follow the 
Periodic Maintenance Schedule on page 65 and 
Periodic Maintenance Procedures which start on 
page 67.

EPA / ARB Installation 
Requirements - USA Only

The following are the installation requirements for 
the EPA / ARB. Unless these requirements are 
met, the exhaust gas emissions will not be within 
the limits specified by the EPA and ARB.

Maximum Exhaust Gas Restriction shall be:

• L48V: 0.53 psi (3.628 kPa; 370 mm Aq) or Iess

• L70V: 0.54 psi (3.727 kPa; 380 mm Aq) or Iess

• L100V: 0.63 psi (4.315 kPa; 440 mm Aq) or Iess

Maximum Exhaust Gas Restriction shall be:

• L48V: 0.10 psi (0.69 kPa; 70 mm Aq) or Iess

• L70V: 0.20 psi (1.37 kPa; 140 mm Aq) or Iess

• L100V: 0.21 psi (1.47 kPa; 150 mm Aq) or Iess

Clean or replace the air cleaner element if the air 
intake restriction exceeds the above mentioned 
value.

Tightening Fasteners

Use the correct amount of torque when you 
tighten fasteners on the machine. Applying 
excessive torque may damage the fastener or 
component and not enough torque may cause a 
leak or component failure.

STANDARD TORQUE CHART

CAUTION

The tightening torque in the Standard 
Torque Chart (page 64) should be 
carefully observed.

• Apply 60% torque to bolts that are not 

listed. 

• Apply 80% torque when tightened to 

aluminum alloy.

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Thread size × Pitch mm

M6×1.0

M8×1.25

M10×1.5

M12×1.75

M14×1.5

M16×1.5

Tightening 
Torque

in  lbs

96.0  ±  9.0

-

-

-

-

-

ft lbs

-

19.0 ± 2.0

36.0 ± 4.0

65.0 ± 7.0

101.0 ± 7.0

167.0 ± 7.0

N·m

10.8 ± 1.0

25.5 ± 2.9

49.0 ± 4.9

88.3 ± 9.8

137.0 ± 9.8

226.0 ± 9.8

kgf·m

1.1 ± 0.1

2.6 ± 0.3

5.0 ± 0.5

9.0 ± 1.0

14.0 ± 1.5

23.0 ± 2.0

PERIODIC MAINTENANCE

LV Operation Manual

65

PERIODIC MAINTENANCE 
SCHEDULE

Daily and periodic maintenance is important to 
keep the engine in good operating condition. The 
following is a summary of maintenance items by 
periodic maintenance intervals. Periodic 
maintenance intervals vary depending on engine 
application, loads, diesel fuel and engine oil used 
and are hard to establish definitively. The 
following should be treated only as a general 
guideline.

CAUTION

Establish a periodic maintenance plan 
according to the engine application and 
make sure you perform the required 
periodic maintenance at intervals 
indicated. Failure to follow these 
guidelines will impair the engine’s safety 
and performance characteristics, 
shorten the engine’s life and may affect 
the warranty coverage on your engine. 
See Yanmar Limited Warranty on 
page vii.

Consult your authorized Yanmar 
industrial engine dealer or distributor for 
assistance when checking items marked 
with a  .

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