The crankshaft journals should be checked for
excessive wear, taper and scoring (Fig. 46). Limits of
taper or out of round on any crankshaft journals
should be held to 0.025 mm (0.001 in.). Journal
grinding should not exceed 0.305 mm (0.012 in.)
under the standard journal diameter. DO NOT grind
thrust faces of No. 3 main bearing. DO NOT nick
crank pin or bearing fillets. After grinding, remove
rough edges from crankshaft oil holes and clean out
all passages.
CAUTION: With the nodular cast iron crankshafts, it
is important that the final paper or cloth polish be
in the same direction as normal rotation in the
engine.
The crankshaft is supported in five main bearings.
All upper and lower bearing shells in the crankcase
have oil grooves. Crankshaft end play is controlled by
a flanged bearing on the number three main bearing
journal (Fig. 47).
Upper and lower Number 3 bearing halves are
flanged to carry the crankshaft thrust loads and are
NOT interchangeable with any other bearing halves
in the engine (Fig. 47). All bearing cap bolts removed
during service procedures are to be cleaned and oiled
before installation. Bearing shells are available in
standard and the following undersized: 0.025 mm
(0.001 in.) and 0.250 mm (0.010 in.). Never install an
undersize bearing that will reduce clearance below
specifications. Replace or machine the crankshaft as
necessary to obtain proper bearing clearances.
INSTALLATION - CRANKSHAFT
CRANKSHAFT MAIN BEARING LOCATION
The crankshaft is supported in five main bearings.
All upper and lower bearing shells in the crankcase
have oil grooves and holes (Fig. 48). Crankshaft end
play is controlled by a flanged bearing on the number
three main bearing journal.
Fig. 45 Bedplate Bolt Tightenening Sequence
Fig. 46 Crankshaft Journal Measurements
Fig. 47 Main Bearing Identification
1 - OIL GROOVE
2 - MAIN BEARINGS
3 - OIL HOLE
Fig. 48 Main Bearing Identification
1 - OIL GROOVE
2 - MAIN BEARINGS
3 - OIL HOLE
9 - 38
ENGINE 2.4L
RS
CRANKSHAFT (Continued)