Valve Clearance - MASSEY FERGUSON MF230 Shop Manual

SERVICE MANUAL
rocker shaft assembly. Remove intake
manifold and exhaust manifold. Remove
high pressure fuel lines, then remove in­
jector nozzles and sealing washers from
cylinder head. Remove stabilizer bar
from thermostat housing. Disconnect ex­
ternal oil supply line from cylinder head.
Loosen cylinder head mounting stud
nuts or cap screws in reverse order of
tightening sequence shown in ap­
propriate Fig. 58 or 59, then lift �Iinder
head from the engine.
Clean gasket surface of cylinder head
and check for warpage or other damage.
Cylinder head can be surfaced and a
maximum of 0.30 mm (0.012 inch)
material may be removed provided injec­
tor nozzles do not protrude more than
4.67 rom (0.184 inch). Do not attempt t.o
use additional injector sealing washers
to reduce nozzle protrusion. Refer to
paragraph 59 to determine whether
valves must be resealed to provide pro­
per recession after cylinder head is
resurfaced.
When reinstalling cylinder head,
make certain all sealing surfaces and
cap screw holes are clean and dry. Light­
ly oil threads of cylinder head stud nuts
and cap screws. Tighten nuts and cap
screws in three equal stages f ollowing
quence shown in Fig. 58 or 59 to a final
torque of 95 N · m (70 ft..lbs.). Tighten
rocker bracket cap screws to a torque of
30 N · m C22 ft.-lbs.). A<ljust valve
clearance as outlined in paragraph 58.
Complete installation by reversing the
removal procedure. Operate engine un­
til normal operating temperature is
reached, then retorque cylinder head
and readjust valves.

VALVE CLEARANCE

All Diesel Models
58. The recommended cold valve
clearance is 0.30 mm (0.012 inch) for
both the intake and exhaust valves. Hot
valve clearance, engine at normal
operating temperature, should be 0.25
rnm (0.010 inch) for all valves. Static set­
ting of all valves can be made from just
Fig. 60-TDC timing maries aligned for valve ed ·
justment as outlined In paragraph 58.
two crankshaft positions using the
following procedure:
Remove timing window plug from left
side of flywheel adapter housing. Turn
crankshaft until TDC timing mark on
flywheel is aligned with punch mark as
shown in Fig. 60 and No. 1 piston is on
compression stroke (both valves closed).
Adjust clearances on No. 1,2,3 and 5
valves as shown in Fig. 61. Turn
crankshaft. one complete turn until
mark again aJigned with punch mark,
i s
se­ then adjust remaining two valves <Fig.
62).
VAL VES AND SEATS
All Diesel Models
59. When disassembling cylinder
head, keep valves in order
be installed in their original positions if
r eused. On some engines, valve heads
and seat locations are numbered con­
secutively from front to rear. Any
r eplacement valves should be marked
prior to installation.
Intake and exhaust valves seat direct­
ly in cylinder head. Valve seat inserts
are available for service installation on
64
exhaust valves only on some models.
Cylinder head must be machined for in­
stallation of valve seat inserts; refer to
Fig. for dimensions. Chill insert in dry
ice prior to installation, then press in-
Fig. 59-0n /are production
engine (Serial No. 152UA
28411DSL end after), use
quence shown when tighten­
Ing cylinder heed
Reverse the sequence when
loosening cap screws.
sert squarely into c ylinder head counter ·
bore using the valve guide as a pilot.
Grind seat insert
valve the recommended distance from
head gasket surface.
Valve face and seat angle is 35
both intake and exhaust of engines w ith
Jetter "S" or "F'' in serial number suf­
fix. Engines without letter "S" or "F"
in serial number suffix are equipped
w ith intake and
face angle. Orig inal production valve
seat angle on these engines is 46°, but
seats can be ref aced to 45
ing valves. On all models, desired seal
contact width is 1.6 mm
intake and 2.4 mm (3/32 inch) for
exhaust.
Valve head should be recessed a
specified amount below face of cylinder
head. Clearance can be measured with
a straightedge and f eeler gage as shown
Fig. 63. Refe• · to the f ollowing
in
specifications:
With "S'' or
Number Sufi tx
TDC
Valve Face and Seat
Angle-
Intake and Exhaust . . . . . . . 35°
Valve Head
Recession-
Intake
Exhaust . . .
they can
so
I piston on compression strolce, 11d)ust the valves
.
Fig 61-W/th TDC timing marks aligned end No.
lndlcettd. Tum crankshaft one re�olullon end
te·
screws.
cap
Fig. 62-W/th TDC timing maries aligned and No.
1 piston on exhaust strolee, adjust rt1e valves In·
5 8 -5 9
Paragraphs
as necessary to recess
o
exhaust
valves \\ith 45
o
when servic­
(1116 inch) for
"F" Serial
. . . . . . . . . . . . 1.32-1.63 mm
m.l
(0.054·0.064
. . . . . . 1.60-1.92 mm
<0.063 0.075 in.)
refer to Fig. 62.
d/cated.
for
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