Kia Forte: Crankshaft Inspection
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1. |
Check the crankshaft bearing oil clearance.
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(1) |
To check main bearing-to-journal oil clearance, remove
the lower crankcase and lower bearings.
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(2) |
Clean each main journal and bearing with a clean shop
towel.
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(3) |
Place one strip of plastigage across each main journal.
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(4) |
Reinstall the lower crankcase and lower bearings, and
then tighten the main bolts.
Tightening torque
1st step:
27.5 ~ 31.4 N.m (2.8~3.2 kgf.m, 20.3 ~ 23.1 lb-ft)
2nd step: 120 ~ 125°
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Always use new crankshaft main bearing
cap bolts. Crankshaft main bearing cap bolts
are toque-to-yield bolts designed to be permanently
elongated beyond the state of elasticity when
torqued, so if the bolts are removed and reused,
it may cause the bolts to break or fail to maintain
clamping force.
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Do not turn the crankshaft.
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(5) |
Remove the lower crankcase and lower bearings.
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(6) |
Measure the width of the plastigage at its widest point.
Oil clearance:
0.016 ~ 0.034 mm (0.00063 ~ 0.00134 in.)
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(7) |
If the plastigage measures too wide or too narrow, remove
the upper and lower bearing and then install a new bearings
with the same color mark. Recheck the oil clearance.
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Do not file, shim, or scrape the bearings or the
caps to adjust clearance.
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(8) |
If the plastigage shows the clearance is still incorrect,
try the next larger or smaller bearing. Recheck the oil clearance.
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If the proper clearance cannot be obtained by
using the appropriate larger or smaller bearings, replace
the crankshaft and start over.
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If the marks are indecipherable because of an
accumulation of dirt and dust, do not scrub them with
a wire brush or scraper. Clean them only with solvent
or detergent.
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Crankshaft Bore Identification Mark
Letters have been stamped on the block as a mark for the
size of each of the 5 main journal bores.
Use them, and the numbers or bar stamped on the crank
(marks for main journal size), to choose the correct bearings.
Cylinder Block Specifications
Calss
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Mark
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Inside Diameter
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a
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A
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59.000 ~ 59.006 mm
(2.32283 ~ 2.32307 in.)
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b
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B
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59.006 ~ 59.012 mm
(2.32307 ~ 2.32330 in.)
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c
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C
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59.012 ~ 59.018 mm
(2.32330 ~ 2.32354 in.)
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Crankshaft Journal Identification Mark
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Conform to read stamping order as shown arrow
direction from #1.
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Crankshaft Specifications
Class
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Mark
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Outside Diameter Of Journal
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I
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1
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54.954 ~ 54.960 mm
(2.16354 ~ 2.16378 in.)
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II
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2
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54.948 ~ 54.954 mm
(2.16330 ~ 2.16354 in.)
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III
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3
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54.942 ~ 54.948 mm
(2.16307 ~ 2.16330 in.)
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Crankshaft Bearing Identification Mark
Crankshaft Bearing Specifications
Class
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Mark
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Thickness Of Bearing
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A
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Blue
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2.021 ~ 2.024 mm
(0.07957 ~ 0.07968 in.)
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B
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Black
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2.018 ~ 2.021 mm
(0.07945 ~ 0.07957 in.)
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C
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None
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2.015 ~ 2.018 mm
(0.07933 ~ 0.07945 in.)
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D
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Green
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2.012 ~ 2.015 mm
(0.07921 ~ 0.7933 in.)
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E
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Yellow
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2.009 ~ 2.012 mm
(0.07909 ~ 0.07921 in.)
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(9) |
Select a crankshaft bearing using the selection chart.
Selection Chart For Crankshaft Bearings
Assembling Classification Of Bearing
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Crankshaft Bore Identification Mark
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a (A)
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b (B)
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c (C)
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Crankshaft Identification Mark
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I (1)
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E (Yellow)
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D (Green)
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C (None)
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II (2)
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D (Green)
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C (None)
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B (Black)
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III (3)
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C (None)
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B (Black)
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A (Blue)
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2. |
Check crankshaft end play.
Using a dial indicator, measure the thrust clearance while prying
the crankshaft back and forth with a screwdriver.
If the end play is greater than maximum, replace the center bearing.
End play
Standard: 0.07 ~ 0.25 mm (0.0028 ~ 0.0098 in.)
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3. |
Inspect main journals and crank pins.
Using a micrometer, measure the diameter of each main journal
and crank pin.
Main journal diameter:
54.942 ~ 54.960 mm (2.16307 ~ 2.16378 in.)
Crank pin diameter:
44.954 ~ 44.972 mm (1.76984 ~ 1.77055 in.)
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Use fender covers to avoid damaging painted surfaces.
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Thoroughly clean all parts to be assembled.
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Crankshaft Disassembly
Crankshaft Reassembly