Yanmar marine engine 6LPA-STP2, 6LPA-STZP2. Manual - part 15

PERIODIC MAINTENANCE

6LPA Series Operation Manual

59

12/05

Replacing the Fuel Filter Element

 Figure 3

Figure 3 

1 – Mounting Screw (2 used)
2 – Housing
3 – Alarm Switch
4 – O-Ring
5 – Filter Element

1. Close the fuel cock of the fuel tank.
2. Remove the two mounting screws 

(Figure 3, (1))

 and the housing 

(Figure 3, (2))

.

3. Drain the fuel from the fuel drain cock 

on the bottom of the fuel / water 
separator.

4. Disconnect the alarm switch harness.

 Figure 4

Figure 4 

5. Remove the alarm switch (Figure 3) 

with a wrench.

6. Remove the filter element 

(Figure 3, (5))

 with a filter wrench. 

7. Install the alarm switch to the new fuel 

filter. 

8. Apply a thin film of clean diesel fuel to 

the sealing surface of the new filter 
gasket. 

9. Install new filter and tighten hand-tight. 

Use a filter wrench and tighten to 
14.7 - 19.6 N·m (130.1 - 173.5 in.-lb).

10.Install filter and tighten hand-tight. 
11.Connect the alarm switch harness.
12.Install the housing and mounting 

screws.

13.Bleed the fuel system. See Bleeding 

the Fuel System on page 29

. Dispose 

of waste properly.

14.Start engine and check for leaks.

(5)

(4)

(3)

(2)

(1)

0004915

Component

Part No.

Fuel Filter Element

119773-55710

0004897

PERIODIC MAINTENANCE

60

6LPA Series Operation Manual

After you complete the initial 50 hour 
maintenance procedures, perform the 
following procedures every 50 hours 
thereafter or monthly, whichever comes 
first.

• Draining Water From the Fuel Tank

• Draining Fuel Filter / Water Separator

• Checking Battery Electrolyte Level

Draining Water From the Fuel Tank

 Figure 5

Figure 5 

1 – Sediment  Bowl
2 – Drain Cock
3 – Fuel Line To Engine

1. Put a pan under the drain cock 

(Figure 5, (2))

 to catch fuel.

2. Open the drain cock and drain water 

and sediment. Close the drain cock 
when the fuel is clean and free of air 
bubbles. 

NOTICE

Dispose of waste properly.

Draining Fuel Filter / Water 
Separator

Water and sediment can clog the fuel filter 
and impair the function of the fuel injection 
pump and valve. If heavy deposits of water 
and sediment are drained, also drain the 
fuel tank.

 Figure 6

Figure 6 

1. Close the fuel cock of the fuel tank.
2. Remove the two mounting screws 

(Figure 6, (1))

 and remove the housing 

(Figure 6, (2))

.

3. Put a pan under the drain cock.
4. Loosen the drain cock of the water 

separator and drain off any water or dirt 
collected inside.

5. Install housing and mounting screws.
6. Bleed air from the fuel system. See 

Bleeding the Fuel System on page 29

.

Every 50 Hours of Operation

(1)

(2)

(3)

0004898

(1)

(2)

0004916

PERIODIC MAINTENANCE

6LPA Series Operation Manual

61

12/05

Checking the Battery Electrolyte 
Level (Serviceable Batteries Only)

WARNING

Batteries contain sulfuric acid. NEVER 
allow battery fluid to come in contact 
with clothing, skin or eyes. Severe 
burns could result. ALWAYS wear 
safety goggles and protective clothing 
when servicing the battery. If battery 
fluid contacts the eyes and / or skin, 
immediately flush the affected area with 
a large amount of clean water and 
obtain prompt medical treatment.

NOTICE

NEVER turn off the battery switch (if 
equipped) or short the battery cables 
during operation. Damage to the electric 
system will result.

Note:  Battery fluid tends to evaporate 

in high temperatures, especially 
in summer. In such conditions, 
inspect the battery earlier than 
specified.

1. Turn the battery master switch to OFF 

(if equipped) or disconnect the negative 
(-) battery cable. 

2. Do not operate with insufficient battery 

electrolyte as the battery will be 
destroyed.

3. Remove the plugs and check the 

electrolyte level in all cells. 

NOTICE

NEVER attempt to remove the covers or 
fill a maintenance-free battery.

4. If the level is lower than the minimum fill 

level (Figure 7), fill with distilled water 
(Figure 7)

 (available in the grocery 

store) up to the upper limit (Figure 7) of 
the battery. 

WARNING

If operation continues with insufficient 
battery fluid, the battery life is 
shortened, and the battery may 
overheat and explode.

 Figure 7

Figure 7 

0004566_s1

PERIODIC MAINTENANCE

62

6LPA Series Operation Manual

Perform the following maintenance every 
125 hours of operation or 6 months, 
whichever comes first.

• Changing the Engine Oil and 

Replacing the Engine Oil Filter

Changing the Engine Oil and 
Replacing the Engine Oil Filter

See Changing the Engine Oil and 
Replacing the Engine Oil Filter Element on 
page 57

.

Perform the following maintenance after 
the initial 250 hours of operation.

• Checking the Fuel Injector Spray 

Pattern

• Inspecting and Adjusting 

Intake / Exhaust Valve Clearance

Checking the Fuel Injector Spray 
Pattern

See your authorized Yanmar Marine dealer 
or distributor.

Inspecting and Adjusting 
Intake / Exhaust Valve Clearance

Proper adjustment is necessary to 
maintain the correct timing for opening and 
closing the valves. Improper adjustment 
will cause the engine to run noisily, 
resulting in poor engine performance and 
engine damage. See your authorized 
Yanmar Marine dealer or distributor to 
adjust the intake / exhaust valve clearance.

Every 125 Hours of Operation

After Initial 250 Hours of 
Operation