VPA 7748089 English 09-2007 31
Engine — 5.0 & 5.7 Litre
Camshaft A steel camshaft is supported by five bearings pressed into the en-
gine block. The camshaft sprocket, mounted to the front of the cam-
shaft is driven by the crankshaft sprocket through a camshaft timing
chain. Motion from the camshaft is transmitted to the valves by hy-
draulic roller valve lifters, valve push rods, and ball-pivot type rocker
arms.
Crankshaft The crankshaft is made of cast nodular iron. It is supported by five
crankshaft bearings that are retained by crankshaft bearing caps
which are machined with the block for proper alignment and clear-
ances. The 5.0L and 5.7L engines have two bolts per cap. The num-
ber five crankshaft bearing at the rear of the engine is the end thrust
bearing. Four connecting rod journals (two rods per journal) are
spaced 90 degrees apart.
Pistons and Connecting Rods The pistons are cast aluminum that use two compression rings and
one oil control ring assembly. The piston is a low-friction, lightweight
design with a flat top and barrel-shaped skirt. The piston pins are
chromium steel. They have a floating fit in the piston and are retained
by a press fit in the connecting rod assembly. The connecting rods
are made out of either forged powdered metal or forged steel. They
are machined with the rod cap installed for proper clearances and
alignment.
Lubrication The gear-type oil pump is driven through an extension driveshaft.
The extension driveshaft is driven by the distributor which is gear
driven by the camshaft. The oil is drawn from the oil pan through a
pickup screen and tube. Pressurized oil is delivered through internal
passages to lubricate camshaft and crankshaft bearings and to pro-
vide valve lash control in the hydraulic valve lifters. Oil is metered
from the valve lifters through the valve push rods to lubricate the
valve rocker arms and ball pivots. Oil returning to the oil pan from the
cylinder heads and the front camshaft bearing, lubricates the cam-
shaft timing chain and crankshaft and camshaft sprockets.
Tools and Shop Equipment
A clean, well-lit, work area should be available. Other necessary
equipment includes: a suitable parts cleaning tank, compressed air
supply, trays to keep parts and fasteners organized, and an ade-
quate set of hand tools. An approved engine repair stand will help aid
with the work and help prevent personal injury or component dam-
age.
Special tools are listed and illustrated throughout this section with a
complete listing at the end of the section. These tools (or their equiv-
alents) are specially designed to quickly and safely accomplish the
operations for which they are intended. The use of these special
tools will also minimize possible damage to engine components.
Some precision measuring tools are required for inspection of cer-
tain critical components. Torque wrenches are necessary for the cor-
rect assembly of various parts.
Accessories
The various procedures in this manual assume that the engine ac-
cessories have been removed. These accessories include all of the
following:
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