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The bearing shells m u s t be installed so t h a t t h e
tangs are i n the machined grooves i n the rods a n d
caps.
L i m i t s o f taper o r out-of-round o n any crankshaft
j o u r n a l s should be h e l d to 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 the bearings i n pairs. Do not use a new
b e a r i n g h a l f w i t h a n old bearing half. Do not file t h e
rods o r bearing caps.
CRANKSHAFT MAIN JOURNALS
The crankshaft j o u r n a l s should be checked for ex-
cessive wear, taper and scoring. L i m i t s of taper or
out-of-round o n a n y crankshaft j o u r n a l s should be
h e l d t o 0.025 m m (0.001 inch). J o u r n a l 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 N u m b e r 3 m a i n bearing. D O N O T n i c k
c r a n k p i n or bearing fillets. After g r i n d i n g , remove
r o u g h edges from crankshaft o i l holes and clean out
a l l o i l passages.
CAUTION: With the nodular cast iron crankshafts
used in all 5.2L and 5.9L engines it is important that
the final paper or cloth polish after any journal
grind be in the same direction as normal rotation in
the engine.
CRANKSHAFT MAIN BEARINGS
B e a r i n g caps are not interchangeable and should
be m a r k e d a t removal to insure correct assembly.
Upper a n d lower b e a r i n g halves are N O T i n t e r -
changeable on the 5.2L engine. Lower m a i n bearing
halves of 2 and 4 are interchangeable. Upper m a i n
b e a r i n g halves o f 2 and 4 are interchangeable. O n
t h e 5.9L engine 1, 2 and 4 upper and lower bearings
are grooved and are interchangeable on h i g h perfor-
mance only. Standard 5.9L engine uses p l a i n lower
m a i n bearings, (except No. 5).
Upper a n d lower N u m b e r 3 bearing halves are
have flanges to carry the crankshaft t h r u s t loads a n d
are N O T interchangeable w i t h a n y other b e a r i n g
halves i n the engine (Fig. 7). A l l bearing cap bolts
removed d u r i n g service procedures are t o be cleaned
a n d oiled before
i n s t a l l a t i o n . B e a r i n g shells are
available i n standard and the following under sizes:
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 an 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 bearing cap before
removal.
5.2L/5.9L ENGINE
9 - 57
Fig.
7 Main Bearing
Identification
(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 (Fig. 8)
i n t o the o i l hole of crankshaft.
(3) Slowly rotate crankshaft clockwise, forcing out
upper h a l f of b e a r i n g shell.
Fig. 8 Removing and Installing Upper Main Bearing
with Tool C-3059
INSTALLATION
O n l y one m a i n b e a r i n g should be selectively
fitted
w h i l e a l l other m a i n bearing caps are properly t i g h t -
ened.
W h e n i n s t a l l i n g a new upper b e a r i n g shell, s l i g h t l y
chamfer the sharp edges from the p l a i n side.
(1) S t a r t b e a r i n g i n place, and i n s e r t Tool C-3059
i n t o o i l hole o f crankshaft (Fig. 8).
(2) Slowly rotate crankshaft counter-clockwise slid-
i n g the b e a r i n g i n t o position. Remove Tool C-3059.
REAR MAIN BEARING OIL SEALS
The 5.2L engine service seal is a t w o piece,
fitted,
R O P E T Y P E . T h e upper rope seal h a l f can be i n -
stalled w i t h crankshaft removed or i n vehicle w i t h
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