Checking Injection Timing; Adjusting Fuel Injection Timing; Fuel Injection Pump And Injectors - Valtra VALMET 6000 Service Manual

22. Fuel system
Fuel injection pump and injectors (Op no
223)
(Bosch in ---line pump)
Note! Concerning fuel injection pumps with a new type gov-
ernor, see page 223/8.
A. Checking injection timing
Note! The exact time at which the fuel should be injected into
no. 1 cylinder is marked with a punch mark on the flywheel.
There is an inspection hole in the flywheel housing and a hole
for the locating tool. Due to the excess fuel flowing into the in-
jection pump the control rod must be moved to the drive posi-
tion when checking the injection timing. Otherwise the timing
will be incorrect!
Checking method:
1. Clean the injection pump and its surroundings carefully.
2. Remove the inspection hole rubber plug from the flywheel
housing.
3. Insert the locator (9025 99100) in the hole on the flywheel
housing front face.
4. Turn the crankshaft to a position where the 1st cylinder pis-
ton reaches its compression stroke top dead centre. Then turn
the crankshaft backwards until the timing mark on the fly-
wheel passes the inspection hole.
5. Remove the protecting cap for the control rod on the injec-
tion pump front face. Fit adjusting tool (sleeve for limiting con-
trol rod travel) 9025 99000. The tool moves the control rod to
the "running position".
6. Disconnect the delivery pipe for the number one cylinder in-
jector at the pump.
7. Clean the delivery valve of fuel. Slowly turn the crankshaft
in the correct direction of rotation until the fuel level in the deliv-
ery valve just begins to rise.
8. Check if the mark on the flywheel is at the point of the locator
which has been inserted into the flywheel housing. Repeat the
check procedure. If the injection pump needs to be adjusted,
follow the instructions under heading B.
9. Fit the delivery pipe and the rubber plug in the flywheel
housing. Remove the locator and the sleeve which was used
to limit the control rod travel. Start the engine.
9025 99100
B. Adjusting fuel injection timing
Important! Adjusting fuel injection timing on 6800, 8750 and
8950 tractors, see page 223/8. Later on all tractors which have
Bosch in ---line pump (G4720 --- (320), G2358 --- (420) and
G5294 --- (620, 634), the injection timing is adjusted according
to instruction on page 223/8.
If the timing is incorrect, adjust as follows:
1. Loosen the retaining nuts (17 mm) of the injection pump
and remove the delivery pipes (17 mm).
109
Model
1. 8. 1998
6000-- 8750
1. 6. 1999
Code Page
223 1
9025 99000