CYLINDER BLOCK (Cont'd)
Checking The Cylinder
Check the cylinder walls for damage and wear. Check the
cylinder bore for out of round and taper. Measure the
diameter of each cylinder bore at the top, center and
bottom with the gauge positioned at the right angles and
parallel to the centerline of the engine. Use only the
measurement at
90° to the engine centerline when
calculating the piston to cylinder bore clearance.
Machine the
cylinders that are damaged or when out of
round or taper
is
more than the wear limits allow.
OIL PUMP
Cleaning The
Oil Pump
Wash
all
parts
in
a solvent and dry them with compressed
air. Use a brush to clean the inside of the pump housing
and the pressure relief valve chamber. Be sure
all dirt and
metal particles are removed.
Checking The Oil Pump
Check the inside of the pump housing and the outer race
and rotor for damage or wear.
Measure the outer race to housing clearance
[A]. check
the clearance between the outer race and the rotor lobes
[B].
With the rotor assembly installed
in
the housing. Put a
straight edge over the rotor assembly and the housing.
Measure the clearance (rotor end play) between the
straight edge and the rotor
[C]. The outer race, shaft and
rotor can be replaced only as
an
assembly. Check the
drive shaft to housing bearing clearance by measuring
the outside diameter of the shaft and the inside diameter
of the housing bearing. Check the relief valve spring
tension.
If the spring tension is not within specifications and the
spring
is
worn or has damage, install a new spring. Check
the relief valve piston for damage and free movement in
the bore.
Revised Oct. 97
-7B-21-
741,742,743,
743DS Bobcat Loader
Service Manual
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