Oversize Or Undersize Components Letter Code - Jeep 1987 Wrangler Workshop Manual

ENGINES
#S1
2.46 LITER (150 CID) FOUR-CYLINDER ENGINE
#S1
SEE
I.S.
N
O
T
E
S
These engines are identified by a letter code (1)
stamped on a boss (2) between the rear of the
block and distributor.
840122A
T h e letters are d e c o d e d a s follows.
O v e r s i z e or Undersize Components
Letter C o d e
Cod©
Letter
Definition
B
All cylinder bores
0.254mm
(0.010-inch) oversize
M All crankshaft main
bearing journals
0.254mm
(0.010-inch) undersize
P
All connecting rod
bearing journals
0.254mm
(0.010-inch) undersize
C All camshaft bearing
bores
0.254mm
(0.010-inch) oversize
Example: The code letters PM indicate that the crank-
shaft main bearing journals and connecting rod
journals are 0.254mm (0.010-inch) undersize.
840123
B-40