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6
It is also recommended that the KMO-500
Bearing Leak Detector be used in final checking of
a bearing replacement as this unit will not only give
you a recheck of your work but will also pre-lubri-
cate the engine.
The following method recommended by a well
known bearing manufacturer requires the use of a
special crankshaft gauge (in combination with stan-
dard outside micrometers) to measure crankshaft
journal diameters, journal taper, and out of round-
ness without removing the crankshaft or upper main
bearings from the engine as follows:
1. Thoroughly clean the crankshaft with a cloth free
of lint.
2. Thoroughly clean the crankshaft gauge and out-
side micrometers especially the angular pads and
the faces of both buttons of the gauge, and the
anvil and spindle of the micrometers.
3. Lock the plunger of the crankshaft gauge in the
farthest down position with the knurled locking
screw.
FIGURE 5
4. Place the gauge on the crankshaft journal, Figure
5, and rock it slightly radially several times.
5. Hold the tool firmly against the journal, loosen the
thumbscrew so that the center plunger butts and
you can hear it click against the shaft.
6. Turn the thumbscrew back and forth several
times, then tighten, DO NOT tighten so hard that
the position of the tool against the crankshaft is
lost. Check this operation several times to get the
feel. Accurate checking will take a little practice
FIGURE 6
The crankshaft journal radius is obtained by
accurately "miking" the distance across the two
center buttons, Figure 6, and multiply this reading
by 2 to obtain the accurate diameter of the shaft.
CAUTION: Micrometers must be accurately
calibrated, because any error in the final read-
ing is doubled.
The design of the tool is based upon geometrical
proportion. The following is an analysis of the prin-
ciples involved, as shown in Figure 7.
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