The DS-163-2478 cylinder head exhaust valve stem seal can be used in the following Caterpillar engine models with 3-valve cylinder heads:
- 3126 with an engine serial number of:
- 6PZ1 and above
- 7JZ1 and above
- 8YS218 through 8YS34999
- BEJ
- 3406
- 3406E
- C7
- C9 with an engine serial number of:
- 4ZF
- 9DG1 and above
- C9A
- C9B
- CKP506 and above
- CSN
- ETK
- LFE
- SAN
- SRB
- X9X
- X9Y
- Z9X
- C10 with an engine serial number of:
- 2PN6204 through 2PN7340
- 3CS701 through 3CS714
- C11
- C15
- C16 with an engine serial number of 7CZ1 and above
- C18 with an engine serial number of:
- CJP
- EFE1 and above
- EST1 and above
- MDP
- MEP
- P1A1 and above
- P1L1 and above
- PDH1 and above
- RHX1 and above
- STH1 and above
