Bearing Selection (Four And Inline Six-Cylinder Engines); Main Bearing Selection Chart-Four-Cylinder Engines - Jeep cherokee 1989 Owner's Manual

Bearing selection (four and inline six-cylinder engines)

Refer to illustrations l9.8a, l9.8b, 1 9 . 8 ~ and l 9 . 8 d
8 If you have a four or inline six-cylinder engine and the oil clearances
are incorrect (see Section 22) or you are replacing the original bearings,
refer to the accompanying charts t o select the correct new bearings
(see illustrations),
9
be installed. Disregard steps 1 1 through 13 and consult the automotive
machine shop that reground the crankshaft. They will provide or help
you select the correct size bearings.
1 0 Regardless of how the bearing sizes are determined, use the oil
clearance measured with Plastigage (see Section 22) as a guide t o en-
sure the proper size bearings are installed.
Crankshaft No. 1 Maln Bearlno
Journal Color Codrs and
Dlamrtrr In Inchss (mm)
2.5001 to 2.4996 (Standard)
(63.5025 to 63.4698 mm)
-
Orange
2.4996 to 2.4991 (0.0005 Undersize)
(63.4898 to 63.4771 mm)
-
Black
2.4991 to 2.4966 (0.001 Underslze)
(63.4771 to 63.4644 mm)
-
Green
2.4986 to 2.4961 (0.0015 Underslze)
(63.4644 tc83.4517 mm)
-
Red
2.4901 to 2.4896 (0.010'Underslze)
(63.2485 to 63.2358 mm)
NOTE: Wlth Green and Red Coded Crankshaft Journals, Use Yellow Coded Cylinder Block Bores Only.
Color Code and Dlamrtrr In
-
Yellow 2.5001 to 2.4996 (Standard)
(63.5025 to 83.4898 mm)
-
Orange
(63.4896 to 63.4771 mm)
-
Black 2.4991 to 2.4986 (0.001 Underslze)
(63.4771 to 63.4844 mm)
-
Green 2.4986 to 2.4961 (0.0015 Underslze)
(63.4644 to 63.4517 mm)
-
Red
2.4901 to 2.4896 (0.010 Underslze)
(63.2485 to 63.2358 mm)
The Motor Manual Guy
Chapter 2 Part D General engine overhaul procedures
Bore Color Codr and
-
Yellow 2.6910 to.2.6915
(66.3514 to 66.3641 mm)
-
Black 2.6915 to 2.6920
-
Yellow 2.6910 to 2.6915
(66.3514 to 68.3641 mm)
-
Black 2.6915 to 2.6920
(66.3461 to 66.3768 mm)
G l o w - 2.6910 to 2.6915
(66.3514 to 66.3641 mm)
-
Black 2.6915 to 2.6920
(68.3461 to 68.3788 mm)
-
Yellow 2.6910 to 2.6915
(66.3514 to 68.3641 mm)
-
Yellow 2.6910 to 2.6915
(88.3514 to 68.3641 mm)
-
Yellow Standard
-
Yellow Standard
Black 0.001-Inch Underslze (0.025 mm)
-
Black 0.001-Inch Underslze (0.025 mm)
-
Red 0.010-Inch Underslze (0.054 mm)
11 Four and inline six-cylinder engines are assembled at the factory
with various sizes of color-coded bearing inserts as listed in illustra-
tions 19.8a through 19.8d. The color code appears on the edge of the
bearing insert.
12 The journal size codes are generally painted on the adjacent cheek
toward the flanged end (rear) of the crankshaft, except for the rear
main bearing journal, which is marked on the crankshaft rear flange.
13 To obtain a select fit, upper and lower bearing inserts of different
a
sizes may be used as pair, For example, a standard insert is sometimes
used in combination with a 0.001-inch undersize insert to reduce
clearance by 0.0005-inch. Caution: Never use apair o f bearing inserts
with a greater size difference than 0.001 -inch. When replacing inserts,
the odd sized inserts must be either all on the top or all on the bottom.
-
Yellow Standard
Yellow Standard
-
Black 0.001-Inch
Underslze (0.025 mm)
-
Black
-
Underslze (0.025 mm)
-
Black
-
Red 0.010-Inch
Underslze (0.254 mm)
-
Yellow Standard
-
Black 0.001-Inch Underslze (0.025mm)
-
Black 0.001-Inch Underslze (0.025 mm)
-
Green 0.002-Inch Underslze (0.051 mm)
-
Red
-
four-cylinder engines
2D-21
-
Black
Underslze (0,025 mm)
-
I
Black 0,001-Inch
-
Underslze (0.001 mm)
Black
Underslze (0,025 mm)
-
Black 0.001-Inch
-
I
Underslze (0.025 mm)
-
Green 0.002-Inch
-
Red
-
Underslze (0.254 mm)
Lowrr lnrrrl Slzr
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