15
II. Engine Component Description
Cylinder Block (continued)
The letters stamped on the block deck
surface represent the grade of the piston.
If these letter(s) do not match the letters
on the piston(s), the pistons have been
replaced.
The number stamped on the block deck
is the liner grading (referencing the
outside diameter of the liner to fit the
block).
The 4J block contains 5 main bearings.
The caps are identified as detailed
below:
#1 1
#2 2
#3 3 (Cast in cap)
#4 4
#5 5 (Cast in cap)
When installing the bearing caps, ensure
that the arrows face forward.
