ENGINE REPAIR
(Cont'd)
Cylinder
Liner
Service
(Cont'd)
To
find
the maximum wear check the inside diameter
in
three different locations [A).
The specifications are 3.2283-3.2292 inches (82-82,021
mm).
The wear limit
is
+ 0.0059 inch
(+
0,15 mm).
When
the cylinder liner has more wear than
specifications, bore and hone the cylinder to
3.2480-3.2489 inches (82,499-82,522 mm).
NOTE: Make
sure
you
use
the
correct
oversize
pistons
and
rings.
If
the cylinder liner is not within the specifications, replace
the cylinder liner. These are dry liners.
Remove the cylinder liners.
Clean
and rub oil
in
the bores of the engine block.
Clean
and put oil
on
the outside of the cylinder liners.
Install
the cylinder liners into the engine block with the
inside and outside diameter chamfered end down.
The top of the
liner must be even with the top of the engine
block machined surface.
After
installation bore and hone the cylinder liner to
3.2283-3.2291 inches (82-82,019 mm).
Lubrication
System
The lubrication system consists of a trochoid rotor-type
driven
oil pump, oil filter cartridge, oil pressure regulating
valve, oil
switch, and oil filter [B].
Oil
is
siphoned by the oil pump (b) from the oil pan
(0)
through the oil filter (a), where the oil
is
kept at
41-64
PSI
(290-441
kPa) by an oil pressure regulating valve
(c)
installed
in
the gearcase. The oil flows towards the filter
cartridge where it will be further filtered.
To
insure the
supply of lubricating oil, a by-pass valve (d)
is
provided,
the
valve opens when the filter element (e)
is
restricted
from the
filter cartridge, the pressurized oil is then
distributed into two area; some
will be fed through
crankshaft passages to the crank pin bearing and the rest
to the rocker arm shaft
(i) through the frame. Oil then
returns to the
oil pan by graVity.
The
oil pressure switch (m) will indicate when oil pressure
drops
below 7
PSI
(48 kPa). The oil pressure switch is
connected to the oil pressure gauge
in
the dash panel. If
the pressure reads low or zero while the engine is
in
normal operation, stop the engine immediately and check
the
oil
level.
A
B
~~~
(c)
(d)
(e)
(f)
(g)
(h)
Revised Sept.
90
-7C-34-
Pump
Screen
Oil
Pump
A-02727
....
--0
Pressure
Regulating Valve
By-Pass
Valve
Filter
Element
Crankshaft
Piston
Idle
Gear
(i)
(j)
(k)
(I)
(m)
en)
Co)
Rocker
Arm
Shaft
Rocker
Arm
Push
Rod
Tappet
Oil
Pressure
Switch
Camshaft
Oil Pan
6-09194
741,742,743,
7430S
Bobcat
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Service
Manual
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