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(6) T a p t h e piston down i n cylinder bore, u s i n g a
h a m m e r handle. A t t h e same t i m e , guide connecting
rod i n t o position o n crankshaft j o u r n a l .
(7) T h e notch or groove o n t o p o f piston m u s t be
p o i n t i n g t o w a r d front o f engine. The larger chamfer
of the connecting r o d bore m u s t be installed t o w a r d
crankshaft j o u r n a l
fillet.
(8) I n s t a l l r o d caps. I n s t a l l n u t s on cleaned a n d
oiled rod bolts and t i g h t e n n u t s t o 6 1 N n n (45 ft. lbs.)
torque.
INSTALLATION
OF CONNECTING
ROD
BEARINGS
F i t a l l rods o n one b a n k u n t i l completed. D O N O T
alternate f r o m one b a n k t o another, because w h e n
t h e rods are assembled to pistons correctly, t h e y are
not interchangeable from one b a n k t o another.
The b e a r i n g caps are n o t interchangeable a n d
should be m a r k e d a t removal t o ensure correct as-
sembly.
Each b e a r i n g cap has a s m a l l " V " groove across the
p a r t i n g face.
W h e n i n s t a l l i n g t h e lower bearing
shell, make certain t h a t the " V " groove i n t h e shell
is i n l i n e w i t h t h e " V " groove i n t h e cap. T h i s pro-
vides l u b r i c a t i o n o f t h e cylinder w a l l i n the opposite
bank.
The bearing shells m u s t be installed so t h a t t h e
tangs are i n t h e machined grooves i n t h e rods and
caps.
L i m i t s o f taper or out-of-round o n any crankshaft
j o u r n a l s should be h e l d t o 0.025 m m (0.001 inch).
Bearings are available i n 0.025 m m (0.001 inch),
0.051 m m (0.002 inch), 0.076 m m (0.003 inch), 0.254
m m (0.010 inch) a n d 0.305 m m (0.012 inch) under-
size. I n s t a l l t h e b e a r i n g s i n p a i r s . D o n o t u s e a
n e w b e a r i n g h a l f w i t h a n o l d b e a r i n g h a l f . D o
n o t f i l e t h e r o d s o r b e a r i n g c a p s .
CRANKSHAFT IDENTIFICATION
A crankshaft w h i c h has one or more connecting rod
or m a i n b e a r i n g j o u r n a l s undersize w i l l be stamped
w i t h 1/4 i n c h letters near t h e notch of t h e No. 6
crankshaft counterweight (Fig. 5).
R X indicates A L L r o d j o u r n a l s are (0.010 inch) u n -
dersize; M X indicates A L L m a i n journals are 0.254
m m (0.010 inch) undersize.
CRANKSHAFT MAIN JOURNALS
The crankshaft j o u r n a l s should be checked for ex-
cessive wear, taper a n d scoring. L i m i t s of taper or
out-of-round on a n y crankshaft journals should be
h e l d to 0.025 m m (0.001 inch). Journal g r i n d i n g
should not exceed 0.305 m m (0.012 inch) under t h e
standard j o u r n a l diameter. D O N O T g r i n d t h r u s t
faces o f No. 3 m a i n bearing. D O N O T nick c r a n k p i n
U n d e r s i z e J o u r n a l
Identification Stamp
.001 inch (Rod)
Rl-R2-R3-Etc.
.010 inch (Rod)
RX
.001 inch (Main)
M1-M2-M3 or M4
.010 inch (Main)
MX
STEEL STAMP IDENTIFICATION
EXAMPLE
R (ROD) AND/OR M (MAIN) FOLLOWED
R2 M4
BY THE ROD OR MAIN NUMBER
OR R3
Fig. 5 Location of Crankshaft Identification on No. 6
Counterweight
or b e a r i n g fillets. A f t e r g r i n d i n g , remove r o u g h edges
f r o m c r a n k s h a f t o i l holes and clean out a l l o i l pas-
sages.
CAUTION: After any journal grind, it is important
that the final paper or cloth polish be in the same
direction as the engine rotates.
CRANKSHAFT MAIN BEARINGS
B e a r i n g caps are n o t interchangeable a n d should
be m a r k e d a t removal to insure correct assembly.
Upper a n d lower bearing halves a r e N O T inter-
changeable. Lower m a i n bearing halves o f No. 1 and
No. 3 are interchangeable.
Upper a n d lower No. 2 bearing halves are flange to
carry t h e crankshaft t h r u s t loads a n d are N O T inter-
changeable w i t h any other bearing halves i n t h e en-
gine ( F i g . 6). A l l bearing capbolts removed d u r i n g
service procedures are t o be cleaned and oiled before
r e i n s t a l l a t i o n . B e a r i n g shells are available i n stan-
dard a n d t h e f o l l o w i n g undersizes: 0.25 m m (0.001
inch), 0.051 m m (0.002 inch), 0.076 m m (0.003 inch),
0.254 m m (0.010 inch) and 0.305 m m (0.012 inch).
Never i n s t a l l a n undersize bearing t h a t w i l l reduce
clearance below specifications.
REMOVAL
(1) Remove o i l p a n and identify b e a r i n g caps before
removal.
(2) Remove b e a r i n g caps one a t a t i m e . Remove up-
per h a l f o f b e a r i n g b y i n s e r t i n g Tool C-3059 i n t o the
o i l hole o f crankshaft (Fig. 7).
(3) S l o w l y rotate crankshaft clockwise, forcing out
upper h a l f o f b e a r i n g shell.
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