
03-40
SECTION 03 - ENGINE PREPARATION
Crankshaft Alignment at Connecting
Rod Journal
Crankshaft misalignment at connecting rod jour-
nal may cause the crankshaft to be hard to manu-
ally turn. Verification can be done by measuring
deflection at each end of crankshaft. Refer to IN-
SPECTION in this section.
If deflection is found to be greater than specified
tolerance, this indicates worn bearing(s), bent
and/or misaligned crankshaft.
For engine disassembly procedure, refer to appro-
priate model year
Shop Manual.
Inspection
Visually inspect parts for corrosion damage.
Inspect crankshaft bearings. Check for scoring,
pitting, chipping or other evidence of wear. Make
sure plastic bearing retainer cage is not melted.
Rotate and make sure bearings turn smoothly.
If crankshaft and/or components are found worn
or damaged, it must be replaced or repaired by a
shop specializing in this type of work.
The inspection of engine crankshaft should in-
clude the following measurements:
Connecting Rod Straightness
Align a steel ruler on edge of small end connect-
ing rod bore. Check if ruler is perfectly aligned
with edge of big end.
1. Ruler must be aligned with edge of connecting rod here
2. Align ruler here
Crankshaft Deflection
Crankshaft deflection is measured at each end
with a dial indicator.
First, check deflection with crankshaft in crank-
case. If deflection exceeds the specified toler-
ance, it can be either ball bearing wear, bent or
twisted crankshaft at connecting rod journal.
1. Measuring PTO side deflection in crankcase
TOLERANCES
MEASUREMENTS
NEW PARTS
(min.)
(max.)
WEAR
LIMIT
Crankshaft
deflection
0
0.05 mm
(.002 in)
0.08 mm
(0031 in)
Connecting rod
big end axial play
0.39 mm
(.015 in)
0.737 mm
(029 in)
1.2 mm
(047 in)
F01D1Q A
1
2
F01D1SA
1
Содержание Bombardier
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