Maintenance Manual DG-808C
Issued: May 2012 TN800/41
3.6
5. Remove the carburettor cover and membrane, remove the needle valve, flush
the carburettor by switching on the fuel pump. The fuel must spout out as a
powerful stream. If a large amount of fuel leaks out of the carburettor when
you remove the membrane this is a sign that:
a) a dirt particle prevents the needle valve from closing completely or
b) the main nozzle is clogged (dirty), so that the engine can't receive the
full amount of fuel. In this case you have to disassemble the main nozzle
and to clean its chamber, see sect. 1.13.7.2 item 2.
c) Check the connection of the throttle cable for damage and wear.
d) Reinstallaton of the carburettor membrane:
Insert the lower half of the O-ring which is incorporated in the
membrane into the groove in the carburettor. Press the cover plate with
light force onto the membrane and move the cover plate in all directions
until the plate slips into the recess at the carburettor (metal of cover plate
on metal of carburettor). This method ensures that the O-ring which is
incorporated in the membrane slips correctly into the groove.
Note:
If you let the membrane dry out it will regain its original size and can be
installed without the above mentioned trick.
6.
Primer
a)
Check the filter of the primer valve. The filter is installed in the fuel
distributor in which the primer valve is inserted. Loosen the hose clamps
and the mounting bolt of the distributor and pull out the primer. Flow
fuel through the filter in reverse direction and check that as the fuel
comes out of the filter any dirt is removed. In addition flow fuel in
reverse direction through that outlet of the multiple-connector where the
excess fuel line restriction is installed. Reinstall the connector.
b)
Check the function of the primer valve and nozzle (engine must be cold).
Switch the primer switch in auto position. Remove the air intake filter.
Enter the DEI-NT set up menu and set primer test Y, then switch on the
ignition and press the starter button. Now the DEI-NT must display a
syringe on the centre display and fuel must be injected via the nozzle
into the intake manifold of the carburettor without the starter motor
operating.
Caution:
Test only for 2-3 seconds, otherwise you may flood the engine.
Enter the DEI-NT set up menu and set to primer test N, otherwise the starter
motor will not function.
c)
Check the hose which connects the primer valve to the carburettor for any
damage.
d)
Leak test of the primer valve: with the ignition on (fuel pump running)
fuel must not be injected.
Summary of Contents for DG-800A
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