MTU Detroit Diesel 183 Series Technical Publication page 192

Group 03
Subgroup 7004
Page 12
Installation
20080/1 E 98-12
Installing piston with conrod
Note
If used pistons are reinstalled the surface of the piston
rings must be visually inspected for chipping; replace
piston rings as necessary (03-7312).
If new pistons are to be installed, they should be
assigned together with the liners according to the
tolerance-group coding.
The tolerance-group coding (arrow) is given on the top
liner surface and the piston crown.
Code:
Þ Liner
Piston
(Letter group) (Code letter)
Þ "
"B
C"
Þ "
C
"B D"
Þ "
D
"C E"
Þ "
E"
"D
Coat piston and piston rings with engine oil. Position
ring butts (arrows) consecutively at 120° intervals.
Task Description
B"
C"
D"
E"