II. Engine Component Description
U
L-Series Diesel 10
Camshaft Design
The camshaft is a cast iron billet and has lobes
for
both
the valves
and
fuel pumps. The cam is
supported by two ball bearings and a needle
bearing (located in the center of the block) to
reduce friction and improve shaft durability.
The lifters are conventional flat tappet design,
requiring periodic valve adjustment. The
camshaft also has an oil galley drilled into the
front of the shaft that provides lubrication for
the flywheel sleeve assembly.
NOTE: It is not uncommon to see marks
that resemble tracks on the fuel pump lobe.
These are track marks from the fuel
pump’s roller lifter. This is a normal
characteristic of this design.
Camshaft Gear Timing
Correct camshaft timing is shown at the left.
The crankshaft is positioned with the key way
at the top. The crankshaft gear timing mark
will be at approximately 9 o’clock. The idler
gear is positioned with one mark at 3 o’clock
(lined up with the crankshaft’s mark), and with
a second mark at 12 o’clock. The camshaft
gear timing mark aligns with that second mark
on the idler gear.
IMPORTANT: The initial timing of these
gears is absolutely essential. Due to the
combination of different gear ratios, the
timing marks will not line-up with their
respective gears after the engine has been
rotated a few times.
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