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| The
spring inside each injector will weaken
over time. When this happens, fuel gets sprayed
into the engine too soon. This can lead to a
pre-detonation condition inside the engine.
The equivalent to this on a gasoline engine
would be the "pinging" that you might
hear when you accelerate. "Nailing"
is the The term used to describe this condition
in diesel engines. Nailing in a diesel engine
is much louder than the gas engine's ping and
sounds like a loud metallic noise. This is one
of the main reasons why some diesels sound much
quieter than others when they are idling. |
|
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| All
of this can lead to poor performance and
cause the engine to smoke excessively, and is
some cases, the pre-chambers exploding. Pre-chambers
protrude inside the combustion chambers of each
cylinder and are what the injectors spray fuel
into to start the combustion process. The key
is to change your Mercedes fuel injectors before
these bad things happen since severe engine
damage can result. |
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| Is
this an easy job that I can do myself? |
| Yes
it is. First you must remove the metal injector
lines between the injection pump and the injector
assemblies. They are usually tied to each other
with metal clamps, so try to remove them all
as a complete assembly without removing these
clamps. This will make it much easier when you
reinstall the fuel injector lines. |
| |
| Now
remove all the injector return lines between
the injectors and the fuel filter. These are
the tiny cloth braided 3.2mm lines. Use your
needle nose pliers to pull them off. Don't worry
about ripping them, because you are going to
install new lines anyway. |
| |
| Take
a 27mm socket and ratchet and remove the injector
assemblies. They will be very tight so don't
be afraid to use some "muscle" to
take them out. Make sure you remove the heat
shields/seal rings where the nozzle was seated
inside the head. Install new heat shields supplied
with the new/remanufactured injector assemblies.
Make sure you put them in the right way, tapered
side down. They will not seal right if they
are installed upside down. |
| |
| Install
injector assemblies, and torque down to manufactures
specifications. Refer to you Mercedes
repair manual. Install new injector return
line, making sure you use the correct German
cloth braided line. Do not use regular rubber
vacuum line, because it cannot hold up to the
fuel pressure and will swell from the diesel
fuel and leak. The last thing you want is for
fuel to spray on a hot engine. |
| |
| Reinstall
the metal fuel lines. Again torque these lines
down to proper torque specifications. It may
take a little longer for the engine to start
because of the air in the lines, but this is
OK since the system will bleed itself. Check
for fuel leaks. |
| |
| So
remember, if you want to minimize noise and
black smoke, improve engine performance and
fuel economy, replace your Mercedes diesel injectors
every 100,000. |
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