Fitting Turbocharger; Adjusting By -Pass Turbo (S1Bg) - Valtra 6000 Workshop Manual

21. Engine
E. Fitting turbocharger
Locate the cause of the defects on the turbocharger. Remedy
the fault before fitting the new turbocharger.
In order for the turbocharger to work satisfactorily, it is import-
ant that the engine oil is in good condition. Likewise the oil
should be to the correct quality specification. The air filter and
oil filter should be serviced according to the handbook specifi-
cation.
The setting of the injection pump critically affects the function
of the turbocharger. The injection pump should be adjusted
according to the manufacturers instructions.
1. Check the tightness of the induction and exhaust mani-
folds, and that they are securely fastened. Ensure that there
are no loose carbon or rust particles, or other foreign objects
in the manifolds.
2. Connect the turbocharger to the exhaust manifold and
tighten down using a new gasket.
3. Connect the induction pipe and the silencer.
4. Pour clean engine oil into the bearing housing through the
inlet oilway. This is very important in order to ensure that the
turbocharger is lubricated at the time of starting.
5. Connect the pressure and return oil pipes. Use a new seal.
Check that there are no tensions in the pipes when tightening.
6. Before starting, pull out the stop control and crank the en-
gine over with the starter motor so that the oil pressure rises.
Start the engine and check that there are no leaks.
Model
1. 11. 1998
1. 9. 2002
F. Adjusting by ---pass turbo (S1BG)
The by ---pass turbo is fitted on 6400DW, 6400 DWRE,
6800DWI, 8450 DWR and 8450 DWRE tractors and also on
HiTech tractors 6550 DWRE, 6650 DWRE, 6750 DWRIE and
6850 DWRIE.
N.B.: Normally the adjustment is unnecessary.
The following equipment are needed:
--- surface table and fixing device for the turbo
--- dial gauge equipped with magnetic base
--- compressed air and pressure controller
--- pressure gauge, reading accuracy 0,015 bar
1. Fasten the turbocharger on the surface table. Fasten the
regulator rod to the by ---pass hole lever but do not fit the cir-
clip.
2. Place the dial gauge stylus against the regulator rod end
and zero the gauge reading (ensure that the by ---pass hole is
closed).
3. Connect compressed air to the pressure controller.
Increase pressure progressively (avoid sudden pressure rise)
until the dial gauge records 0,4 mm movement in the rod.
Note! This movement removes clearances and should be
happened at a pressure of max. 1,035 bar (8450: 0,9 bar).
When pressure further increases, starts the actual opening
movement which opens the by ---pass passage.
4. Adjust, if necessary, the rod length until the correct pressure
value has been reached.
5. When the adjustment is correct, tighten the rod locking nut.
6. Fit the rod circlip and the boost pressure pipe.
13
Code Page
6000-- 8750
216 5