PHYSICAL
ID
Cr
an
ks
haft
• For improved strength and ease
in
machining, the crankshaft no longer has
lightening holes drilled into the connecting
rod pins.
• The counterweights are larger
to
counteract
the extra weight in the connecting rod pin.
• The engine serial number break for this
change is 576010.
Note:
The
"larger''
crankshafts
may
only
be
u
sed
In crankcases
with
serial
nu
m
bers
higher
than
571930.
Cr
a
nk•
•••
• The lower section
of
t
he
crankcase has
been modified to allow larger crankshaft
counterweights to clear the crankcase.
• The serial number break for this change is:
571930.
• This change occurred on the crankcase
prior to the crankshaft.
Note:
This
crankcase
may
be
used
with
either crankshafts described above.
Ca•s
ha
ft
• The 1999 model year engine incorporates
a chassis mounted electric luel pump.
• Due to the use
of
an electric fuel pump the
eccentric lobe on the camshaft has been
eliminated.
6
Engine Serial
# 57601 0
an
d above
Counterweig
ht
has
a
radius
Lightening
ho
le
Mechanical lift
pum
p eccentric eliminated
Engine Serial
#576009
and
below
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