This Technical Information Bulletin is a supplement to TI-C-36, J-132 dated February 1989
Subject: Spark Plugs
Vehicles: All
As of Model Year 1990, all engines - except C 18 NZ, 20 NE, C 20 NE, C 20 NEF - will be factory-equipped with spark plugs with a thermal rating of "7".
C 18 NZ, 20 NE, C 20 NE and C 20 NEF engines will be factory-equipped with spark plugs with a thermal rating of "8".
C 16 LZ - as an exception - has spark plugs with a thermal rating of "6".
Survey of spark plugs which are factory-installed or are available from P & A.
Engine Spark Plug
Type Designation Designation Catalogue No.
OHV All WR 7 BC 12 14 805
CR 425 FS 12 14 138
CIH All WR 7 BC 12 14 805
CR 425 FS 12 14 138
OHC C 16 LZ CR 42 CX LSX 12 14 803
OHC C 18 NZ, 20 NE, WR 8 DC 12 14 002
C 20 NE, C 20 NEF
OHC ALL OTHERS WR 7 DC 12 14 807
CR 42 XLS 12 14 139
DOHC 20 XE, C 20 XE, FR 7 DL 12 14 804
C 20 XEJ
DOHC C 30 SE FR 7 DTC 12 14 001