Yanmar engines LV series (L48V, L70V, L100V). Manual - part 15

ENGINE OPERATION

46

LV Operation Manual

Set Engine Speed Control to START

Several types of engine speed controls 
are used in LV engine applications. The 
following procedures are for three typical 
applications. Refer to the operating 
instructions for the driven machine.

1. If your engine speed control is similar to 

Figure 10 slide the engine speed control 
lever (Figure 10, (1)) to the RUN position 
(Figure 10, (2)).

Figure 10

2. If your engine speed control is similar to 

Figure 11 slide the engine speed control 
lever (Figure 11, (1)) to the RUN position or 
(Figure 11, (2)).

Figure 11

3. If your engine speed control is similar to 

Figure 12:

(a) Turn the engine speed control knob 

(Figure 12, (1)) to the left (Figure 12, (2)).

(b) Slide the engine speed control knob to the 

START position (Figure 12, (3)).

(c) Turn the engine speed control knob to the 

right (Figure 12, (4)) to tighten it.

Figure 12

Start The Engine

Use the following procedure to start the engine.

1. Insert the key into the key switch.

Figure 13

STOP

SLOW

RUN

(1)

(2)

0001354A

RUN

STOP

(2)

(1)

0001355A

CAUTION

NEVER use an engine starting aid such 
as ether. Engine damage will result.

0000009en

(1)

(4)

(3)

(2)

0001356A

OFF

ON

S

TA
R

T

0001549C

(2)

(1)

ENGINE OPERATION

LV Operation Manual

47

2. Turn the key clockwise to the START position 

(Figure 13, (1)). Release the key as soon as 
the engine starts. It will return to the ON 
position (Figure 13, (2)).

3. If the engine fails to start:

(a) Wait until the engine comes to a complete 

stop before you attempt to start it again. 
Engaging the starter while the engine is 
still rotating will result in damage to the 
starter motor and flywheel.

(b) Wait at least 30 seconds before you 

attempt to start the engine again. This 
pause will allow the battery voltage to 
recover to prevent damage to the starter 
motor due to the low battery voltage.

CHECK THE ENGINE DURING 
OPERATION

CAUTION

Make sure the engine is installed on a 
level surface. If a continuously running 
engine is installed at an angle greater 
than 20° (in any direction) or if an engine 
runs for short periods of time (less than 
3 minutes) at an angle greater than 25° 
in any direction, engine oil may enter the 
combustion chamber causing exessive 
engine speed and generate white 
smoke. This may cause serious engine 
damage.

0000010enTNE

CAUTION

New Engine Break In:

• On the initial engine start-up, allow the 

engine to idle for approximately 15 
minutes while you check for proper 
engine oil pressure, diesel fuel leaks, 
engine oil leaks, coolant leaks, and for 
proper operation of the indicators 
and / or gauges.

• During the first hour of operation, vary 

the engine speed and the load on the 
engine. Short periods of maximum 
engine speed and load are desirable. 
Avoid prolonged operation at 
minimum or maximum engine speeds 
and loads for the next 4 to 5 hours.

• During the break-in period, carefully 

observe the engine oil pressure and 
engine temperature.

• During the break-in period, check the 

engine oil and coolant levels 
frequently.

0000011en

ENGINE OPERATION

48

LV Operation Manual

1. After the engine has reached operating 

temperature, all of the indicators (if equipped) 
should be Off. If any of the indicators are On, 
shut down the engine and have the necessary 
repairs performed.

2. Check for any fuel or engine oil leaks. If any 

leaks are found shut down the engine and 
have the necessary repairs performed.

3. Check for abnormal sounds or vibration. In 

some applications the engine and its 
mounting may start to resonate and cause 
unusual vibrations at certain engine speeds. 
Avoid running the engine at these speeds. If 
the abnormal sounds or vibration cannot be 
resolved, shut down the engine and have the 
necessary repairs performed.

4. Check for white or black smoke from the 

exhaust system. A small amount of white 
exhaust smoke is normal on start-up of a cold 
engine. Black exhaust smoke could mean the 
engine is overloaded or being over-fueled. If 
either of these conditions persists, contact 
your authorized Yanmar industrial engine 
dealer or distributor.

5. Check the fuel level during operation. If the 

fuel level runs low, stop the engine and refuel.

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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ENGINE OPERATION

LV Operation Manual

49

ADJUST ENGINE SPEED

Use the engine speed control to adjust the engine 
speed for the task that will be performed.

Several types of engine speed controls are used 
in LV engine applications. The following 
procedures are for three typical applications. 
Refer to the operating instructions for the driven 
machine.

1. If your engine speed control is similar to 

Figure 14 slide the engine speed control 
lever (Figure 14, (1)) in the direction shown to 
adjust the engine speed.

Note: This is a friction adjustment. If the 

speed control will not maintain a given 
speed, tightening the nut will increase 
the friction on the speed control lever.

Figure 14

2. If your engine speed control is similar to 

Figure 15 slide the engine speed control 
lever (Figure 15, (1)) in the direction shown to 
adjust the engine speed.

Note: This type of speed control, typically 

used on a generator set, has only one 
speed setting. When you move the 
lever to the right, it clicks into the RUN 
position. The speed control lever is 
spring-loaded so when you push down 
on the STOP button, the speed control 
lever moves back to the shut-off 
position. There is no idle position or 
intermediate speeds.

Figure 15

CAUTION

New Engine Break In:

• On the initial engine start-up, allow the 

engine to idle for approximately 15 
minutes while you check for proper 
engine oil pressure, diesel fuel leaks, 
engine oil leaks, coolant leaks, and for 
proper operation of the indicators 
and / or gauges.

• During the first hour of operation, vary 

the engine speed and the load on the 
engine. Short periods of maximum 
engine speed and load are desirable. 
Avoid prolonged operation at 
minimum or maximum engine speeds 
and loads for the next 4 to 5 hours.

• During the break-in period, carefully 

observe the engine oil pressure and 
engine temperature.

• During the break-in period, check the 

engine oil and coolant levels 
frequently.

0000011en

STOP

SLOW

RUN

0001354B

(1)

RUN

STOP

(1)

0001355B