Checking Piston; Fitting Piston Together With Connecting Rod - Valtra 6000 Workshop Manual

21. Engine
F. Checking pistons
Check the condition of the pistons and piston pins. Pay
special attention to possible cracks on the edge of the com-
bustion chamber and on the upper edge of the piston pin
hole. Measure the diameter of the piston at the point shown
in the figure below. Renew a piston if needed.
G. Fitting piston pin
1. Place the connecting rod inside the piston and push the pis-
ton pin into place.
Note! The combustion chamber and the weight class letter
should be on opposite sides!
2. Fit the piston pin circlips. Ensure the the circlips are pressed
correctly into the grooves. The circlip ends must point
upwards.
1. 9. 1992
1. 1. 1994
H. Fitting piston together with connecting
rod.
1. Check that the bearing locations are clean and place the
bearing shells in the connecting rod and bearing cap. Note
the position of the bearing shells.
2. Lubricate piston, rings and cylinder bore. Ensure that the
piston ring gaps are spread around the piston.
320, 420
620:
3. Fit the piston with the marking on the connecting rod
(weight class) facing the camshaft (an arrow on the piston
must point forward).
4. Lubricate the big ---end bearing journal and bearing shells,
and push the piston down. Fit the bearing cap so that the
notches for the guide lugs are in the same side. Tighten the
connecting rod bolts to 40 Nm+90˚.
5. Check that the connecting rod has sufficient end float on the
big ---end bearing journal.
62
Model Code
6000-- 8750
213
Page
6