7.3L DIT 1994-1998.5
The direct injection engines get a little more
interesting. Riddle me this: when are three different
crankshafts actually two? When they are
used in the 7.3L DIT engine.
The first two crankshafts are considered the
same product. The only difference between them
is the size of the hole bored into the rod throws.
One (c/n 1818200C1) has 1-1/8˝ bore balance
holes in the rod throws and the other (c/n
1818200C3) has 1˝ bore balance holes drilled in
them. The diameter of the balance hole was
changed for better strength and reliability.
Despite this difference, these cranks are considered
the same and are fully interchangeable
(Figure 9). Use either of these cranks in serial
number engines 501 through 661,973.
Figure 5 The 7.3L IDIT block is stronger, with a 1/4˝
pipe thread for the turbo oil feed. The non-turbocharged
block has a 1/8˝ hole for the oil pressure gauge.
1/4” Pipe Thread
Turbo Block Only
Non-Turbo 1/8”
Figure 6 First series 7.3L DIT blocks had a large
opening at the upper valley area of the cylinder head
deck.
Figure 7 The second series 7.3L DIT block casting has
solid casting support areas between each cylinder bore
as well as additional crank counterweight clearance in
the lower block.
Figure 8 All IDI and IDIT engines in both 6.9L and 7.3L
sizes use the same crankshaft (c/n 1085420C1).
Rebuilding The Ford 7.3L Powerstroke Engine
www.engine-7.3L DIT 1998.5-2004
The third crank (which is actually
the second design) has no
balance hole in the rod throw at
all and has a slightly different
configured counterweight. This
crank can only be used in the
later block casting (c/n
1825849C1) which has the
clearance (Figure 10). This
crank is used in serial number
661,974 through 2,030,402
