Kia Forte: Crankshaft Inspection

Second generation YD (2014-2018) / Kia Forte TD 2014-2018 Service Manual / Engine Mechanical System / Cylinder Block / Crankshaft Inspection

Check the crankshaft bearing oil clearance.

(1)	To check main bearing-to-journal oil clearance, remove the lower crankcase and lower bearings.

(2)	Clean each main journal and bearing with a clean shop towel.

(3)	Place one strip of plastigage across each main journal.

(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°

•	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.

•	Do not turn the crankshaft.

(5)	Remove the lower crankcase and lower bearings.

(6)

Measure the width of the plastigage at its widest point.

Oil clearance:

0.016 ~ 0.034 mm (0.00063 ~ 0.00134 in.)

(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.

Do not file, shim, or scrape the bearings or the caps to adjust clearance.

(8)

If the plastigage shows the clearance is still incorrect, try the next larger or smaller bearing. Recheck the oil clearance.

If the proper clearance cannot be obtained by using the appropriate larger or smaller bearings, replace the crankshaft and start over.

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.

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	Mark	Inside Diameter
a	A	59.000 ~ 59.006 mm (2.32283 ~ 2.32307 in.)
b	B	59.006 ~ 59.012 mm (2.32307 ~ 2.32330 in.)
c	C	59.012 ~ 59.018 mm (2.32330 ~ 2.32354 in.)

Crankshaft Journal Identification Mark

Conform to read stamping order as shown arrow direction from #1.

Crankshaft Specifications

Class	Mark	Outside Diameter Of Journal
I	1	54.954 ~ 54.960 mm (2.16354 ~ 2.16378 in.)
II	2	54.948 ~ 54.954 mm (2.16330 ~ 2.16354 in.)
III	3	54.942 ~ 54.948 mm (2.16307 ~ 2.16330 in.)

Crankshaft Bearing Identification Mark

Crankshaft Bearing Specifications

Class	Mark	Thickness Of Bearing
A	Blue	2.021 ~ 2.024 mm (0.07957 ~ 0.07968 in.)
B	Black	2.018 ~ 2.021 mm (0.07945 ~ 0.07957 in.)
C	None	2.015 ~ 2.018 mm (0.07933 ~ 0.07945 in.)
D	Green	2.012 ~ 2.015 mm (0.07921 ~ 0.7933 in.)
E	Yellow	2.009 ~ 2.012 mm (0.07909 ~ 0.07921 in.)

(9)

Select a crankshaft bearing using the selection chart.

Selection Chart For Crankshaft Bearings

Assembling Classification Of Bearing		Crankshaft Bore Identification Mark
Assembling Classification Of Bearing		a (A)	b (B)	c (C)
Crankshaft Identification Mark	I (1)	E (Yellow)	D (Green)	C (None)
	II (2)	D (Green)	C (None)	B (Black)
	III (3)	C (None)	B (Black)	A (Blue)