68
MS 460, MS 460 C
In the case of problems with the
carburetor or fuel supply system,
also check and clean,
b
12.5
The carburetor can be tested for
leaks with the carburetor and
crankcase tester 1106 850 2905.
– Remove the carburetor,
b
12.2.1
:
Push the fuel line (1)
1110 141 8600 onto the
nipple (2) 0000 855 9200.
VA
143RA172
2
1
:
Push the fuel line with nipple onto
the carburetor’s elbow connector.
VA
176RA264
:
Push the nipple into the pressure
hose of tester 1106 850 2905.
:
Close the vent screw (1) on the
rubber bulb (2) and pump air into
the carburetor until the pressure
gauge (3) shows a reading of
approx. 0.8 bar (80 kPa).
VA
176RA265
2
1
3
If this pressure remains constant,
the carburetor is airtight. However, if
it drops, there are two possible
causes:
1. The inlet needle is not sealing
(foreign matter in valve seat or
sealing cone of inlet needle is
damaged or inlet control lever
sticking). Remove to clean,
b
12.3.2
2. Metering diaphragm damaged,
replace if necessary,
b
12.3.1
– After completing the test, open
the vent screw (1) and pull the
fuel line off the carburetor.
– Push the fuel hose onto the
elbow connector.
– Install the carburetor,
b
12.2.1
Reassemble all other parts in the
reverse sequence.
– Remove the carburetor,
b
12.2.1
:
Take out the screws (arrows).
– Remove the end cover.
– Carefully remove the gasket and
VA
176RA270
pump diaphragm from the end
cover.
:
Carefully separate the diaphragm
and gasket.
– Inspect diaphragm for damage
and wear and replace if
necessary.
VA
176RA272
12.2.2 Leakage Test
12.3
Servicing the Carburetor
12.3.1 Metering Diaphragm