Yanmar engines LV series (L48V, L70V, L100V). Manual - part 14

ENGINE OPERATION

42

LV Operation Manual

CAUTION

Observe the following environmental 
operating conditions to maintain engine 
performance and avoid premature 
engine wear:

• Avoid operating in extremely dusty 

conditions.

• Avoid operating in the presence of 

chemical gases or fumes.

• Avoid operating in a corrosive 

atmosphere such as salt water spray.

• NEVER install the engine in a 

floodplain unless proper precautions 
are taken to avoid being subject to a 
flood.

• NEVER expose the engine to the rain.

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CAUTION

Observe the following environmental 
operating conditions to maintain engine 
performance and avoid premature 
engine wear:

• NEVER run the engine if the ambient 

temperature is above +104°F (+40°C) 
or below +14°F (-10°C)

◆

If the ambient temperature exceeds 
+104°F (+40°C) the engine may 
overheat and cause the engine oil to 
break down.

◆

If the ambient temperature falls 
below +14°F (-10°C) rubber 
components such as gaskets and 
seals will harden causing premature 
engine wear and damage.

◆

Contact your authorized Yanmar 
industrial engine dealer or 
distributor if the engine will be 
operated in either temperature 
extreme.

• Contact your authorized Yanmar 

industrial engine dealer or distributor 
if you need to operate the engine at 
high altitudes. At high altitudes the 
engine will lose power, run rough, and 
produce exhaust gases that exceed 
the design specifications.

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CAUTION

NEVER engage the starter motor while 
the engine is running. This may damage 
the starter motor pinion and / or ring 
gear.

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ENGINE OPERATION

LV Operation Manual

43

STARTING THE ENGINE

Recoil Start

Use the following procedure to start the engine.

Daily Checks

1. Make sure you follow the procedures stated in 

Daily Checks on page 34.

2. Make sure the fuel cock is in the ON position 

(Figure 1, (1)).

Figure 1

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

Figure 2

2. If your engine speed control is similar to 

Figure 3 slide the engine speed control lever 
(Figure 3, (1)) to the RUN position 
(Figure 3, (2)).

Figure 3

3. If your engine speed control is similar to 

Figure 4:

(a) Turn the engine speed control knob 

(Figure 4, (1)) to the left (Figure 4, (2)).

(b) Slide the engine speed control knob to the 

START position (Figure 4, (3)).

(c) Turn the engine speed control knob to the 

right (Figure 4, (4)) to tighten it.

CAUTION

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

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(1)

STOP

SLOW

RUN

(1)

(2)

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RUN

STOP

(2)

(1)

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ENGINE OPERATION

44

LV Operation Manual

Figure 4

Start The Engine

1. Grasp the recoil starter handle (Figure, (1)).

2. Pull the handle out slowly until you feel strong 

resistance. 

3. Slowly return the recoil starter handle to the 

initial position.

4. Push the decompression lever (Figure 8, (1)) 

down and release it. The decompression 
lever will automatically return to the original 
position when the engine starts. Some LV 
model engines have an automatic, internal 
compression release mechanism and do not 
have the external compression release lever. 
Refer to the specific instructions for your 
driven machine.

5. Grasp the recoil starter handle (Figure, (1)).

6. Pull the handle all the way out with a strong 

and even motion. Use two hands if necessary.

7. Slowly return the recoil starter handle to the 

initial position.

8. If the engine does not start, repeat the Start 

The Engine procedure from Step 1.

Figure 5

CAUTION

Tips while starting engine with recoil 
starter (See Start The Engine on 
page 46.):

• Pulling out the recoil starter handle 

too hard or fast will damage the 
equipment.

• ALWAYS pull recoil starter handle all 

the way out or the engine will not start.

• NEVER allow the recoil starter handle 

to snap back against the engine. 
Return the handle to the starting 
position gently to prevent damage to 
the recoil starter.

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CAUTION

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

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(1)

(4)

(3)

(2)

0001356A

(1)

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ENGINE OPERATION

LV Operation Manual

45

In Cold Weather - L48V Only

If you have trouble pulling the recoil handle on an 
L48V engine in cold weather follow this 
procedure:

1. Remove the oil plug (Figure 6, (1)).

2. Add 2 cc of engine oil to the oil port 

(Figure 7, (1)).

Figure 6

3. Reinsert the oil plug (Figure 6, (1)).

Figure 7

Figure 8

Electric Start

Use the following procedure to start the engine.

Daily Checks

1. Make sure you follow the procedures stated in 

Daily Checks on page 34.

2. Make sure the fuel cock is in the ON position 

(Figure 9, (1)).

Figure 9

(1)

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(1)

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CAUTION

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

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(1)

0001124A

(1)