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YO-233-B2A Engine Maintenance Manual
TEO-540-A1A Engine Maintenance Manual
Connecting Rod Inspection Checklist for YO-233-B2A Engine Models (Cont.)
Item
Refer to the "Connecting Rods - Parallelism /
Squareness Check" in this chapter.
Measure the distance between arbors (Figure
29). For exact parallelism or alignment, the
distances measured on both sides are to be
the same.
Measure clearance at the points where the
arbors rest on the parallel blocks (Figure 30)
using a feeler gage. Compare the clearance
between each arbor and the parallel blocks
against the values in the latest revision of the
Service Table of Limits - SSP-1776.
Connecting Rod Bearing and Crankshaft Clearance
To complete this inspection:
NOTICE: For this inspection, the connecting rods, bearings, connecting rod bolts, and nuts
(Figure 25) are assembled, but not installed on the crankshaft.
All of the connecting rods installed on the crankshaft must be of the same weight class,
except "S" weight rods (service rods) can be used with either "A" or "E" weight rods
depending on parts availability. Record the weight code of each connecting rod in this
checklist.
1. Assemble and torque each connecting rod with acceptable bearings per instructions in the
"Connecting Rod Installation" section in this chapter.
2. Measure the inside diameter of the bearing in each connecting rod and record the
measurement below.
3. Measure the crankshaft diameter at the crank pin journal for each connecting rod and record
the measurement below.
4. Subtract the crankshaft diameter at the crank pin journal from the inside diameter of the
bearings for each connecting rod to calculate the connecting rod bearing and crankshaft
clearance. Record the measurement below.
5. Compare the connecting rod bearing and crankshaft clearance to the acceptable clearance
measurement in the latest revision of the Service Table of Limits - SSP-1776.
6. Remove and discard the connecting rod bolts and nuts from the connecting rod assembly.
7. If the connecting rod bearing and crankshaft clearance is within limits, the connecting rod
bearings are acceptable.
8. If the connecting rod bearing and crankshaft clearance is not within limits, replace the
connecting rod bearings with oversize bearings to bring the clearance within acceptable
limits.
© 2021 Avco Corporation. All Rights Reserved
February 2021
Findings
Connecting Rod 1
Connecting Rod 2
Connecting Rod 3
Connecting Rod 4
Parallelism
Squareness
Measurement
Measurement
Page 125
72-30
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