13Series 4144 Powerhead
6. Engine
Removal and installation of the
engine is described in the service
manual for "Series 4144
Components – FS, FC, KM".
6.1 Leakage Test
Defective oil seals and gaskets or
cracks in castings are the usual
causes of leaks. Such faults allow
supplementary air to enter the
engine and upset the fuel-air
mixture.
This makes adjustment of the
prescribed idle speed difficult, if not
impossible.
Moreover, the transition from idle
speed to part or full throttle is not
smooth.
Always perform the vacuum test
first and then the pressure test.
The engine can be checked
thoroughly for leaks with the pump
0000 850 1300.
The engine does not need to be
removed for the leakage test.
6.1.1 Preparations
– Remove the fan housing – see
service manual for "Series 4144
Components – FS, FC, KM"
– Remove the spark plug boot with
cap.
: Unscrew the spark plug (1).
– Set the piston to top dead center.
This can be checked through the
spark plug hole.
– Fit the spark plug (1) and tighten
it down firmly.
– Tightening torques, b 3.3
: Loosen the screws (arrows).
– Lift the muffler (1).
938RA093 TG
1
938RA015 TG
1
: Fit the sealing plate (1)
0000 855 8106 between the
cylinder exhaust port and muffler
and tighten down the screws
moderately.
The sealing plate must completely
fill the space between the two
screws.
– Remove the carburetor
– see service manual for
"Series 4144 Components – FS,
FC, KM"
Check that the gasket (1) is in
position.
938RA016 TG
1
938RA017 TG
1
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