Valtra 6550 - Crankshaft Seals; Pistons and Connecting Rods; Lubricating Oil Pump; Working Orders (Op. No. 219)

83
Model Code Page
21. Engine
1. 9. 1992
6000--8750 219 1
Working orders
A. Crankshaft seals
(Rear seal, see page 211/6).
(Front seal, see page 214/3).
--- Before changing the crankshaft rearoil seal, split the tractor
at the clutch (see Op 411 1A) and detach the clutch assembly
(also possible turbine clutch) and the flywheel.
--- When changing the crankshaft front seal, drain the coolant
from the cooling system. Remove the cooling radiator and the
belt pulley/hub at the front end of the crankshaft.
Note! The cooling radiator can also be detached so that the
entire front weight bracket is detached together with parts
which are fitted on it.
B. Cylinder head and valve mechanism
(Cylinder head and valves, see page 212/1)
(Rocker arm mechanism, see page 212/5)
--- Before removing the cylinder head, remove the engine
hood plates, engine coolant and detach all parts which are
attached to the cylinder head. After that the cylinder head can
be removed.
--- Rocker arm mechanism is accessible after removing the
valve cover.
--- Pushrods can be removed after removing the valve cover
and the rocker arm mechanism.
C. Pistons and connecti ng rods
(Pist ons and connecting rods, see page 213/3)
If only pistons/connecting rods are to be changed, the
simplest working order is as follows:
--- Drain the engine coolant and the engine oil. Detach the
front weight bracket together with parts which are fitted on it
(e.g. radiator).
--- Remove the front axle. Support the engine and tractor
frame and unsc rew the oil sump fixing bolts and remove the
oil sump (unbolt only lower bolts at the frame joint at the
clutch).
--- R e m o v e th e cy li nd er he a d or h e a d s on 620 --- eng in es .
--- Loosen the connecting rod big---end bearing caps and
push the pistons together with connecting rods upwards and
remove them through the cylinder bore.
D. Lubricating oil pump
(Lubricating oil pump, see page 215/1)
--- Drain the engine coolant and the engine oil. Detach the
front weight bracket together with the parts which are fitted on
it (e.g. radiator).
--- Remove the front axle. Support the engine and tractor
frame and unsc rew the oil sump fixing bolts and remove the
oil sump (unbolt only lower bolts at the frame joint at the
clutch).
--- The oil pump can now be removed from the lower face of
the cylinder block.
E. Balancer unit (only 420---engine s)
(Balancer unit, see page 213/7)
--- Drain the engine coolant and the engine oil. Detach the
front weight bracket together with parts which are fitted on it
(e.g. radiator).
--- Remove the front axle. Support the engine and tractor
frame and unsc rew the oil sump fixing bolts and remove the
oil sump (unbolt only lower bolts at the frame joint at the
clutch).
c) The balancer unit is now accessible and can be detached
from the cylinder block lower face.
F. C r a n k s h a f t
(Crankshaft, see page 213/1)
--- Split the tractor at the clutch. Remove the clutch assembly
and possible turbine clutch and the flywheel.
--- Remove the engine coolant and the radiator. Detach the
engine.
G. Cylinder liners
(Cylinder liners, see page 211/1)
--- Drain the engine coolant and the engine oil. Detach the
front weight bracket together with parts which are fitted on it
(e.g. radiator).
--- Remove the front axle. Support the engine and tractor
frame and unsc rew the oil sump fixing bolts and remove the
oil sump (unbolt only lower bolts at the frame joint at the
clutch).
--- R e m o v e th e cy li nd er he a d or h e a d s on 620 --- eng in es .
--- Loosen the connecting rod big---end bearing caps and
push the pistons together with connecting rods upwards and
remove them through the cylinder bore.
--- Remove the cylinder liners upwards.