Cylinder Head - Kubota Z400-B Handbuch

Rocker Arm and Cylinder Head
1. Remove the grow plugs (3).
2. Remove the rocker arms and shaft assembly (1).
3. Remove the push rods.
4. Loosen the hose clamp (4), and remove the screws, the
nuts and the cylinder head (2).
(When reassembling)
• Be sure to place the O-ring (5) (See photo).
• Apply engine oil to the head screws and nuts, and tighten
them in the specified sequence (See figure), in several
steps and to the specified torque.
• After tightening all the screws and the nuts, run the
engine until it warms up and tighten them again to the
specified torque.
a .... b - c - d ----- ­
(1)
Z400B D600·B V800·B
(2)
Z430B D640·B
(3)
O109F062
(4)
(5)
Valve
19.4 to 24.5 N'm
Grow plug 2.0 to 2.5 kgf'm
14.5 to 18.1 ft·lbs
9.81 to 11.28 N· m
Rocker arm nut 1.00 to 1.15 kgf·m
7.23 to 8.32 ft·lbs
Tightening torque
I
23.5 to 27.5 N'm
I
Cylinder head stud 2.4 to 2.8 kgf'm
17.4 to 20.3 ft-Ibs
39.2 to 44.1 N'm
Cylinder head
4.0 to 4.5 kgf'm
screw and nut
28.9 to 32.5 ft-Ibs
Rocker Arm Shaft Assembly
Cylinder Head
Grow Plug
Hose Clamp
O-ring
1. Remove the valve cap (5) and the valve spring collets (4),
compressing the valve spring (2) with the valve spring
retainer (3).
2. Remove the valve spring retainer (3) and the valve spring
(2).
(When reassembling)
• Clean the valve stem and valve guide, and apply engine oil
to them.
• Be sure to adjust the valve clearance after installing the
valve.
• Be sure to lap the valve on its seat after replacing the
O109POll valve, referring to "Correcting Valve and Seat".
(1) Valve
(2) Valve Spring
(3) Valve Spring Retainer
(4) Collet
(5) Valve Cap
S-67