Technical data

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njection pump / Injector Venting Injection pump

Fuel pump

Check Injection pump, injector Check Fuel jet, venting

Clean Fuel pump

NOTE

Carry out the check with the throttle in the

fully open position and with the starting

filling not pulled.

- After installing the testing device No

74 64 1 333 545 of which the connections at

the sides must be closed off, crank the engine

by hand until the pressure gauge shows a

pressure of 300-350 bar

WARNING

Danger of Injury

- Stop cranking and watch whether the pressure

is maintained. If the pointer falls back, and if the

pump does not maintain a pressure of 250 bar

either, the injection pump is defective

NOTE

During the testing, the injection valve can

be connected to the testing device in

place of a blind plug.

WARNING

Danger of Injury

- When cranking the engine by hand, watch the

injection pressure on the pressure gauge and

the function of the injector

WARNING

Danger of injury due to the fuel jet

As the engine has automatic fuel system venting, the

necessity for a manual venting does not apply, as

the trapped air in the injection pump escapes

through the return line during the filling of the pump

with fuel.

Due to the pulsating of the feed pump, the restrictor

causes a constant flow of fuel in the injection pump.

Possible gas bubbles are automatically drawn off,

thereby service interruptions resp. interferences are

prevented.

NOTE

In the case of possible service

interferences and after longer periods of

engine standstill check the functioning of

the vent valve.

- Crank the engine with the handcrank resp.

starter and remove the vent valve at entry to the

fuel tank

- Fuel must pulse from the fuel line

If this is not the case, stop the engine and

unscrew the vent valve

- Clean the valve with fuel and compressed air,

resp. replace the valve

- When cleaning the fuel supply pump, unscrew

cover and remove filter.

- Clean the fuel filter, especially under protruding

corners of the cover

- Insert the filter again, fasten cover.

Correct function “a”

Incorrect function “b”