Diesel engine 12V 4000 G73, 16V 4000 G73. Manual - part 21

7.8 Fuel Filter

7.8.1 Fuel filter – Replacement

Preconditions

☑ Engine is stopped and starting disabled.

Special tools, Material, Spare parts

Designation / Use

Part No.

Qty.

Filter wrench

F30379104

1

Engine oil
Easy-change filter

(→ Spare Parts Catalog)

WARNING

Fuels are combustible.

Risk of fire and explosion!

• Avoid open flames, electrical sparks and ignition sources.

• Do not smoke.

Replacing fuel filter

1.

Remove easy-change filter using filter

wrench.

2.

Clean sealing surface on filter head.

3.

Slightly lubricate seal on the easy-change

filter.

4.

Screw on easy-change filter by hand until

the seal connects and tighten manually.

5.

Vent fuel system (→ Page 84).

6.

Replace other easy-change filters in the

same way.

7.8.2 Fuel prefilter cleaning

Preconditions

☑ Engine is stopped and starting disabled.

Special tools, Material, Spare parts

Designation / Use

Part No.

Qty.

Diesel fuel
Sealing ring

(→ Spare Parts Catalog)

WARNING

Fuels are combustible.

Risk of fire and explosion!

• Avoid open flames, electrical sparks and ignition sources.

• Do not smoke.

Fuel prefilter cleaning

1.

Shut off fuel supply.

2.

Remove nuts from filter head.

3.

Take off filter housing and drain fuel into

appropriate container.

4.

Remove filter-element securing nut and re‐

move filter element by pulling it downwards.

5.

Wash filter element in clean fuel using a

smooth brush.

6.

Wash filter housing with clean fuel.

7.

Insert filter element into filter housing and

secure with nut.

8.

Place new sealing ring into groove in filter

head.

9.

Fit cover with seal and secure it with nuts

crosswise.

10.

Open fuel supply.

TIM-ID: 0000004936 - 001

7.8.3 Fuel prefilter – Differential pressure gauge check and adjustment

DANGER

Unguarded rotating and moving engine components.

Risk of serious injury – danger to life!

• Take special care when working on a running engine.

WARNING

Engine noise above 85 dB (A).

Risk of damage to hearing!

• Wear ear protectors.

Adjusting differential pressure

gauge

1.

When installing the new filter element: align

adjustable pointer (2) with pressure-indicat‐

ing pointer (3) of pressure gauge (1).

2.

Check differential pressure.

Checking differential pressure of fuel prefilter

1.

With the engine running at full load or rated power, read off pressure at gauge (1).

2.

If differential pressure as indicated between position of adjustable pointer (2) and pressure-indicating

pointer (3) of pressure gauge is ≥ 0.3 bar, flush filter element of the cut-in filter (→ Page 89).

7.8.4 Fuel prefilter – Draining

Preconditions

☑ Engine is stopped and starting disabled.

Special tools, Material, Spare parts

Designation / Use

Part No.

Qty.

Diesel fuel
Gasket

(→ Spare Parts Catalog)

WARNING

Fuels are combustible.

Risk of fire and explosion!

• Avoid open flames, electrical sparks and ignition sources.

• Do not smoke.

Fuel prefilter – Draining

1.

Cut out filter to be drained.

I Left filter cut in

II Right filter cut in

2.

Open threaded vent plug (5) of filter to be

drained.

3.

Unlock drain valve (6) by pressing toggle

and open it.

4.

Drain water and contaminants from filter un‐

til pure fuel emerges.

5.

Close drain valve (6).

6.

Remove screws for cover and take off cov‐

er (2).

7.

Fill filter housing with clean fuel.

8.

Place new gasket in cover (2).

9.

Fit cover with gasket and secure it with

screws.

10.

Cut in the cut-out filter again.

11.

Close threaded vent plug (5) when fuel

emerges.

TIM-ID: 0000004929 - 003