WÄRTSILÄ PAAE051728, Instruction Manual

Page: 267 / 394

6 Lift out the injection valve
with the tool 800029.
7 Protect the fuel inlet hole
of the injection valve and the
bore in the cylinder head.
16.4.3 Overhauling of injection valve
1 Inspect the nozzle
immediately after removing the injec-
tion valve from the engine. Carbon deposits (trumpets) may
indicate that the nozzle is in poor condition, or that the spring
is broken. Clean outside of the nozzle with a brass wire brush.
Don’t use steel wire brush .
2 Check the function and condition of the nozzle,
i.e.
the opening pressure and spray uniformity.
3 Release the nozzle spring tension
by opening the
counter nut (6) and releasing the adjusting screw (7).
4 Remove the nozzle from the holder
by turning the cap
nut (14) using tool 800037 until it is loosened. Keep the nozzle
together with the holder body, don’t let it follow up with the nut.
If there is coke between the nozzle and the nut, the dowel pins
may break and damage the nozzle. To avoid this, knock on the
nozzle, using a piece of pipe according to Fig 16-5, to keep it
towards the holder. Never knock directly on the nozzle tip .
Be careful not to drop the nozzle.
5 Check the nozzle needle movement
which may vary as
follows:
·
needle completely free
·
needle free to move within the normal lifting range
·
needle is sticking
The needle must not be removed by force because this often
results in complete jamming. Unless it can be easily removed,
immerse the nozzle in lubricating oil and heat oil to 150 - 200°C.
Normally, the needle can be removed from a hot nozzle.
32-200627-01 Injection System 16
WÄRTSILÄ 32 16 - 13