Service manual

G420F(FE) Service Manual Chapter 3. Engine Mechanical System
109
Discrimination of crankshaft bearing
CLASS MARK
THICKNESS OF
BEARING
AA BLUE
2.014~2.017mm
(0.0793~0.0794in.)
A BLACK
2.011~2.014mm
(0.0791~0.0793in.)
B NONE
2.008~2.011mm
(0.0790~0.0791in.)
C GREEN
2.005~2.008mm
(0.0789~0.0790in.)
D YELLOW
2.002~5.005mm
(0.0788~0.0789in.)
Selection
CRANKSHAFT
INDENTIFICATIO
N MARK
CRANK-
SHAFT BORE
IDENTIFICATI
ON MARK
ASSEM-
BLING
CLASSIFIC
ATION OF
BEARING
a (A) D(YELLOW)
b (B) C (GREEN)
I(YELLOW)
c (C) B(NONE)
a (A) C (GREEN)
b (B) B (NONE)
II(NONE)
c (C) A (BLACK)
a (A) B (NONE)
b (B) A (BLACK) III(WHITE)
c (C) AA (BLUE)
4. Check crankshaft endplay. Using a dial indicator,
measure the thrust clearance while prying the
crankshaft back and forth with a screwdriver.
Standard end play : 0.06 ~ 0.26mm (0.0023 ~
0.010in.)
Limit : 0.30 mm (0.0118in.)
If the end play is greater than maximum, replace the
thrust bearings as a set.
Thrust bearing thickness : 2.44 ~ 2.47 mm(0.096
~ 0.097in.)
5. Inspect main journals and crank pins Using a
micrometer, measure the diameter of each main
journal and crankpin.
Main journal diameter : 55 mm (2.165in.)
Crank pin diameter : 45 mm (1.77in.)