AGCO Power 49 - Valve Mechanism; Reconditioning Valve Mechanism

3.4 Valve mechanism
3.4.1 Reconditioning valve mechanism
Procedure
1.
Check the valve tappets, especially the contact surface against the camshaft.
Worn or damaged tappets must be discarded.
2.
Check the straightness of the push rods by
rolling the push rods on a surface table.
a) Also check the spherical surfaces at the
ends.
b) See the length difference between the
push rods in different engine types.
Total length
of push rod
Order
number of
push rod
Engine type
245 - 246.3
mm
8370 70119 33 - 74
286 - 287.3
mm
8370 69014 84 -98
3.
Disassemble and clean the rocker arm
mechanism.
a) Check the shaft for wear.
b) Check that the oil ways are clean.
Fig. 30
4.
Check the diameter of the rocker arm bore,
25.000 - 25.021 mm.
5.
Change the worn or damaged rocker arm.
6.
Grind the rocker arm valve contact surface to
the correct shape, where necessary.
Do not grind more than necessary, as the
hardened layer is thin.
Fig. 31
7.
Fit the plug to the other end of the rocker
arm shaft.
8.
Lubricate the shaft.
9.
Fit the parts in the correct order.
Note the correct position of the shaft and the
bearing brackets.
10.
Fit the other end plug and tighten plugs to 25
Nm.
Fig. 32
3. Maintenance
4th Generation Engines 3-21
8370 79492