Crankshaft Main Bearings; Sealant Application To Bearing Cap; Apply Sealant To Bearing Cap-To-Block Joint - Dodge 2001 Ram 1500 Owner's Manual

9 - 32 ENGINE 3.9L
CRANKSHAFT (Continued)
(5) Remove and discard the crankshaft rear oil
seals.
(6) Remove and discard the front crankshaft oil
seal.
INSTALLATION
(1) Lightly oil the new upper seal lips with engine
oil.
(2) Install the new upper rear bearing oil seal with
the white paint facing towards the rear of the engine.
(3) Position the crankshaft into the cylinder block.
(4) Lightly oil the new lower seal lips with engine
oil.
(5) Install the new lower rear bearing oil seal into
the bearing cap with the white paint facing towards
the rear of the engine.
(6) Apply 5 mm (0.20 in.) drop of Loctite 518, or
equivalent, on each side of the rear main bearing cap
(Fig. 25). DO NOT over-apply sealant or allow the
sealant to contact the rubber seal. Assemble bearing
cap to cylinder block immediately after sealant appli-
cation.
Fig. 25 Sealant Application to Bearing Cap
1 - MOPAR SILICONE RUBBER ADHESIVE SEALANT SLOTS
2 - LOCTITE 515 (OR EQUIVALENT)
3 - CAP ALIGNMENT SLOT
4 - REAR MAIN BEARING CAP
(7) To align the bearing cap, use cap slot, align-
ment dowel, and cap bolts. DO NOT remove excess
material after assembly. DO NOT strike rear cap
more than two times for proper engagement.
(8) Clean and oil all cap bolts. Install all main
bearing caps. Install all cap bolts and alternately
tighten to 115 N·m (85 ft. lbs.) torque.
(9) Install oil pump (Refer to 9 - ENGINE/LUBRI-
CATION/OIL PUMP - INSTALLATION).
(10) Apply Mopar Silicone Rubber Adhesive Seal-
ant, or equivalent, at bearing cap-to-block joint to
provide cap-to-block and oil pan sealing (Fig. 26).
Apply enough sealant so that a small amount is
squeezed out. Withdraw nozzle and wipe excess seal-
ant off the oil pan seal groove.
(11) Install new front crankshaft oil seal (Refer to
9 - ENGINE/ENGINE BLOCK/CRANKSHAFT OIL
SEAL - FRONT - INSTALLATION).
(12) Immediately install the oil pan (Refer to 9 -
ENGINE/LUBRICATION/OIL PAN - INSTALLA-
TION).
(13) Install new rear oil seal (Refer to 9 -
ENGINE/ENGINE
SEAL - REAR - INSTALLATION).
Fig. 26 Apply Sealant to Bearing Cap-to-Block Joint
1 - MOPAR GEN II SILICONE RUBBER ADHESIVE SEALANT
NOZZLE TIP
2 - SEALANT APPLIED
3 - CYLINDER BLOCK
4 - REAR MAIN BEARING CAP
CRANKSHAFT MAIN
BEARINGS
DESCRIPTION
Main bearings (Fig. 27) are located in the cylinder
block. One half of the main bearing is located in the
crankshaft main bore the other half of the matching
bearing is located in the main bearing cap. there are
four main bearings. Number two main bearing is
flanged, this flange controls crankshaft thrust.
OPERATION
The main bearings encircle the crankshaft main
bearing journals, this aligns the crankshaft to the
centerline of the engine and allows the crankshaft to
turn without wobbling or shaking therefore eliminat-
ing vibration. The main bearings are available in
standard and undersizes.
BLOCK/CRANKSHAFT
BR/BE
OIL