Balance Weight-To-Eccentric Clearance; Measuring Balance Weight To Crankshaft Eccentric Ring(S) Clearance; Measuring Balance Weight Guide Pin And Guide Shoe-To-Closure Plate Guide Channel Running Clearance - Kohler Courage SV470 Service Manual

Section 9
Inspection and Reconditioning

Balance Weight-to-Eccentric Clearance

Before the balance weight assembly is reassembled to
the crankshaft, the running clearance to the crankshaft
eccentrics must be accurately checked. Failure
to maintain the required clearances will result in
vibration or engine failure.
NOTE: Do not use a feeler gauge to measure balance
weight-to-eccentric clearance.
Measuring Balance Weight to Crankshaft
Eccentric Ring(s) Clearance
1. Use an inside micrometer, telescoping gauge,
or bore gauge and measure the inside diameter
of the balance weight bearing surface. Take two
measurements 90° to each other on each weight.
See Figure 9-4.
Figure 9-4. Measuring Balance Weight Bearing
Surface.
2. Then use an outside micrometer and measure
across each eccentric on the crankshaft. Again
take two measurements 90° to each other. See
Figure 9-5.
Figure 9-5. Measuring Crankshaft Eccentric.
9.4
3. The running clearance is the eccentric
diameter subtracted from the balance weight
bearing diameter (step 1 minus step 2). If
the measurements are outside the maximum
wear limits listed in Section 1, the affected
component(s) must be replaced.
Measuring Balance Weight Guide Pin and Guide
Shoe-to-Closure Plate Guide Channel Running
Clearance
1. Use an outside micrometer and measure the
outside width of the balance weight guide shoe.
See Figure 9-6.
Figure 9-6. Measuring Balance Weight Guide Shoe.
2. Use an inside micrometer, telescoping gauge or
similar tool and measure the width of the guide
channel in the closure plate. See Figure 9-7.
Record these dimensions.
Figure 9-7. Measuring Guide Channel in Closure
Plate.