Yanmar YM276 Service Manual page 159

Air Intake System 3005-5
THERMOSTART SYSTEM
REMOVAL
1. Disconnect battery ground cable.
2.
Disconnect wire at the thermostarf plug
( A ) .
3. Remove fuel hose clamp. (0).
4. Remove thermostart plug.
(C),
A -Wiring Lead
B
-
n o s Clamp
C
-
Thsrmortan
Plug
D
-
Fuel Cup
INSPECTION
Inspect the thermostart plug, fuel reservoir, and hoses for evidence
of flaws, cracks, or other deficiencies which would cause the
system t o not work properly.
Check thermostan plug bad d e c k value for leak. Too much
carbon deposit or wet on the plug head mean fuel leaks from valve.
Replace it.
If a visual inspection does not reveal the cause for the thermostart
plug not working, the plug should be tested for ball check valve
operation and heater coilligniter continuity.
-
Check Valve Test
Perform the check valve test t o make sure that the ball check
valve works correctly.
Use the following procedure:
1. Connect shop air supply (A) t o inlet line (B) and t o thermostart
plug
(C).
Regulate pressure t o 137 Kpa (1.4 kg/cm2) (20 psi).
Use any suitable line as a means t o mnnect air hore t o the
thermostart plug.
A piece of m p p r tubing bent in the
shape shown in Fig. works well.
2. Immerse the thermostan plug
in
a container of diesel fuel
(D) for 10 seconds.
3. Watch for air bubbles coming out from body of plug as a result
of the ball check valve unseating. I f bubbles appear, replace
the thermostart plug.
A
-
Shop Air
Supply
0
-
Inlet Line
C
-
TherrnoStsrt
Plug
D
-
Contaimr
INSTALLATION
Install thermostan plug in the intake manifold. Connect wiring
lead t o therminal. and connect supply hose t o plug.
SMEZ76011183W
YM276 and
276D
Kinomat.,, Printed
in Jam"