ENGINE REMOVAL
(Cont'd)
Disconnect the engine harness from the chassis harness
[AJ.
Remove the choke control from the front panel and put
it
in
the engine compartment [B).
Remove any other items necessary.
Remove the engine using a table as shown
in
[C).
ENGINE REPAIR
Cylinder Head
Do
not grind more than .010 inch (0,154 mm) from the
cylinder head gasket surface. Remove all rough edges
and scratches with an
oil stone.
Valve Guides
If
the valve guides become worn,
it
will be necessary to
install valves with
an
oversize stem.
Valves with oversize stems are available in the following
oversize amounts:
.003 inch
.015 inch .030 inch
Use
a reamer of the correct size to make valve guides
larger.
When going from a standard size
valve to an oversize
valve, always use the reamer
in
steps. Grind the valve
seat after the valve guide.
Grinding
The Valve Seats
The valve seats are part of the cylinder head. If the valve
seats become damaged so that the valves and seat are
not
in
correct contact, grinding of the valve seats
is
necessary
[OJ.
Grind both the intake and the exhaust valve seats at 45
°.
Grind only enough to give the valve seat a smooth
surface.
Grind the valve seat the correct width.
(See
SPECIFICA TIONS Section 88.) Use a 60° grinding wheel
to remove the material from the bottom of the
valve seat
and a
30° grinding wheel for the top of the valve seat. The
valve seat must be
in
contact at approximately the center
of the
valve surface.
Revised
Oct. 97
-7B-14-
A
D
TO REMOVE
STOCK
FROM
TOP
OF
SEAT,
USE 30°
WHEEL
TO REMOVE
STOCK FROM
BOTTOM OF SEAT,
USE 60°
WHEEL
741,742,743,
7430S
Bobcat
Loader
Service
Manual
To Next Page
Loading...