Caterpillar Engines

Engine

Plug size

Link

1100, 1140, 1145, 1150, 1160, 3100, 3116, 3126B (oil drain plug on side), 3126E, C-6, C-7, C-9, 938, 3126, 3208

3/4″-16-UNF-T15

3116, 3126, 3126B, C4, C7, C9 (oil drain plug on bottom)

M18x1.5-T15

3176, 3406, 3408, 3412, C10, C11, C12, C13, C14, C15, C16, C18, C27, C30, 3306 (some)

1″1/8-12-UNF-T15

All CAT’s with tapered pipe plug

1″-11.5-NPT-T12

CT11-15

M27x2.0-T12

KT1150, QSKT19, KTTA19

1″1/16-12-UNF-T15