Servicing The Carburetor; Metering Diaphragm; Leakage Test - Stihl MS 460 Service Manual

12.2.2 Leakage Test

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
2 1
: Push the fuel line (1)
1110 141 8600 onto the
nipple (2) 0000 855 9200.
: Push the fuel line with nipple onto
the carburetor's elbow connector.
68
3
: 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).
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.
12.3

Servicing the Carburetor

12.3.1 Metering Diaphragm

2
1
– Remove the carburetor, b
12.2.1
: Take out the screws (arrows).
– Remove the end cover.
– Carefully remove the gasket and
pump diaphragm from the end
cover.
: Carefully separate the diaphragm
and gasket.
– Inspect diaphragm for damage
and wear and replace if
necessary.
MS 460, MS 460 C