Fuel system
OPM 320 en-GB 56
© Scania CV AB 2019, Sweden
Checking deposits in the
combustion chamber
The procedure only applies if pure biogas is used
as fuel, and after cleaning the flame arrestor and
throttles in accordance with the previous two
sections.
Tools
Read the safety precautions before starting work.
1. Remove the spark plug connection and the
spark plug. See the section Renewing the
spark plugs.
2. Check if there are any deposits in the com-
bustion chamber using an endoscope.
3. Check the amount of deposits on the top of
the piston.
The cylinder, piston and the valve head must
be cleaned if
– deposits on the top of the piston are flak-
ing,
or if
– the deposit protrudes at least 5 mm from
the valves.
The cleaning procedure is described in the
Workshop Manual, which can be ordered
from a Scania dealer or directly from Scania.
4. Repeat steps 1-3 on the other cylinders.
Designation Illustration
Endoscope
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