SANY LATIN AMERICA
6-12
SY195/205/215/225C9 Crawler Hydraulic Excavator
Testing and Adjusting
Shop Manual - June 2013
6. Cover the fuel injector mounting opening
with cloth.
7. Activate the start motor in order to run the
engine. Check if the cloth is stained by for-
eign substances.
8. Determine the problem with the engine ac-
cording to the substances (engine oil and/
or coolant) on the cloth.
1) When engine oil is found, it might be
improper sealing caused by piston ring.
Check the piston ring.
2) When engine oil and coolant are found,
it might be cracking of cylinder. Replace
the crankcase.
9. Mount the gasket and tool
to the fuel
injector mounting hole and fix them with
the injector cap. Install the compression
pressure gauge.
10. Start the engine and measure the com-
pression pressure of each cylinder. Calcu-
late the differential pressure between the
cylinders.
11. When the compression pressure and the
differential pressure between cylinders de-
viate from their limits, inject a small amount
of engine oil through the fuel injector
mounting hole, and measure the compres-
sion pressure again.
●
If the compression pressure is higher,
it is probably due to worn or damaged
piston ring or cylinder inner surface.
●
If the compression pressure is still low,
it is probably due to stuck valve or im-
proper seating, or improperly mounted
gasket of cylinder head.
ZX215-1004005
Rags
Injector
mounting hole
CAUTION
When coolant and/or engine oil is found
attached to the cloth, running the engine
may cause the hot coolant and engine oil
to squirt out through the mounting hole of
the fuel injector. This is very dangerous.
Never touch or look into the fuel injector
mounting hole when the engine is running.
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