Leakage Testing; Carburetor Repair; Metering Diaphragm - Stihl TS 700, TS 800 Service Manual

12.2.2 Leakage testing

The tank vent must also be checked
and cleaned if problems develop
with the carburetor or fuel supply,
b 12.6
The carburetor can be tested for
leaks with the carburetor and
crankcase tester 1106 850 2905.
– Disconnect the fuel hose from the
carburetor and remove the
carburetor, b 12.3
2 1
: Push the fuel line (1)
1110 141 8600 onto the double
connector (2) 0000 855 9200.
: Push the fuel line with double
connector onto the fuel port
(arrow).
70
3
– Push the pressure hose of the
tester 1106 850 2905 onto the
double connector.
: 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
the pressure drops, there are two
possible causes:
1. The inlet valve is not sealing
(impurities in the valve seat, sealing
cone of the inlet needle is damaged
or
inlet control lever is 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's elbow
connector.
– Push the fuel hose onto the
elbow connector.
– Install the carburetor, b 12.2.1
– Tightening torques, b 3.6
– Reassemble remaining parts in
reverse order.
12.3

Carburetor repair

12.3.1 Metering diaphragm

2
1
– Remove the carburetor,
b 12.2.1
: Take out the screws (arrows).
: Remove the end cover (1) and
metering diaphragm with gasket
(arrow).
If the gasket and diaphragm are
stuck to the carburetor, they must
be removed very carefully.
: Carefully separate the metering
diaphragm (1) and gasket (2).
1
1
2
TS 700, TS 800