5.5
Engine and Cooling Systems
5
ENGINE INSPECTIONS
Cylinder Head Inspection
Using a flat bar and a feeler gauge, inspect each cylinder
head for warping. Replace head if warping exceeds .003
"
(.08mm).
Cylinder Measurement
Inspect each cylinder for wear, scratches, or damage. If no
damage is evident, measure the cylinder for taper and out
of round with a telescoping gauge or a dial bore gauge.
Measure the bore 1/2
" from the top of the cylinder; in line
with the piston pin and 90
° to the pin to determine if the
bore is out of round. Repeat the measurements at the
middle and bottom of the cylinder. Use the chart below and
record all measurements.
Crankshaft Runout Inspection
1. Support the crankshaft in a set of “V” blocks as shown.
2. Use a dial indicator to measure the runout at the following
locations:
• PTO end = First taper after bearing flat.
• MAG end = 1/2" from bearing flat.
3. Runout deflection cannot exceed .0025" (.07mm).
4. If the runout deflection exceeds the maximum
specification, crankshaft trueing may correct the deflection.
= In. / mm.
Cylinder Head Warp Limit
.006
" (.015mm)
Cylinder Measurement Worksheet
TOP
XY
MIDDLE
XY
BOTTOM
XY
Out-of-Round = Top X - Top Y and Bottom Y - Bottom X
Taper = Top Y - Bottom Y and Top X - Bottom X
= In. / mm.
Taper Limit = .002" (.051mm)
Out-of-Round Limit = .002
" (.051mm)
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