2012/04/30 Caterpillar

Engine:

C13 (S/N: KWJ1-UP)

C15 (S/N: LDN1-UP; RKS1-UP)

C18 (S/N: ZKB1-UP; EJG1-UP; BDN1-UP)

Generator Set:

C15 (S/N: ZKA1-UP; PEC1-UP; C5E1-UP; STG1-UP; C5H1-UP; C5L1-UP; NKL1-UP; X4R1-UP; CYY1-UP)

C18 (S/N: C6C1-UP; G4C1-UP; N1D1-UP; DKE1-UP; PEJ1-UP; NKK1-UP; STM1-UP; EKW1-UP; M1Z1-UP; GBM1-UP; GEN1-UP; MGS1-UP)

C27 (S/N: DWB1-UP)

C32 (S/N: SXC1-UP; JSJ1-UP; RNX1-UP)

Industrial Engine:

C-15 (S/N: BEM1-UP)

C11 (S/N: GLS1-UP)

C13 (S/N: LGK1-UP)

C15 (S/N: JRE1-UP; JAS1-UP)

C18 (S/N: JDA1-UP; NBB1-UP; WJH1-UP)

C27 (S/N: TWM1-UP)

C32 (S/N: TLD1-UP)

Marine Engine:

C18 (S/N: WKB1-UP; PLE1-UP; GES1-UP; JKX1-UP; T2P1-UP)

C32 (S/N: SLT1-UP; T3T1-UP; RNY1-UP; RNZ1-UP)

Petroleum Engine:

C-15 (S/N: Z2C1-UP)

C11 (S/N: B5K1-UP)

C15 (S/N: PET1-UP; JDK1-UP)

C18 (S/N: WJW1-UP)

C32 (S/N: B2C1-UP; SMP1-UP)

Petroleum Power Train Package:

C32 PET GENSET (S/N: PEF1-UP)

TH35-C13T (S/N: PBW1-UP)

TH35-C15I (S/N: PBN1-UP)

TH35-C15T (S/N: PBL1-UP)

TH48-E70-C32P (S/N: PKG1-UP)

The improved 230-3728 O-Ring Seal and 230-3775 O-Ring Seal provide better sealing capability due to an improved manufacturing process. These O-Ring seals are adaptable back to first production on the serial numbers listed above.

This process improvement is effective for all engine serial numbers built on or after 3January 2011.