ENGINE AR-PRIMARY 4788548 - Caterpillar

Power GenerationC18 MAR GENSET (S/N: SSM1-146; SSW1-122)EngineC-15 (S/N: C2A1-3592)C15 (S/N: MG21-155; BS91-137; N5F1-1009)C18 (S/N: BE21-150; BG41-356; TNA1-5287; GTB1-5123; GJE1-1911; JLE1-5718; N8F1-758; T2R1-5537; ZPS1-288; PHW1-152; GEX1-5257)Generator SetC15 GEN SET (S/N: AR21-2236; GB31-841; CE51-103; LNA1-6679; LZA1-502; L8B1-503; LXJ1-3576; NAP1-1663)C18 GEN SET (S/N: AR31-231; LNB1-1784; LZB1-164; L8D1-491; X5F1-107; LXK1-1950; T4X1-1)Industrial EngineC15 IND (S/N: MCW1-10766)C15 INDUSTRIAL (S/N: JKG1-1312)C18 INDUSTRIAL (S/N: MMB1-9016; WJB1-458; WRH1-9202)Marine EngineC18 MARINE (S/N: JHL1-740; DTP1-467)Petroleum EngineC15 PETROLEUM (S/N: JDY1-769)C18 PETROLEUM (S/N: WJY1-676)Petroleum Power Train PackageC15 KNOCKDOWN K (S/N: 1151-91)C15P (S/N: PGN1-161)C18 KNOCKDOWN K (S/N: 1881-56)CX31-P600-C15I (S/N: PDM1-179)CX31-P600-C18I (S/N: PDC1-1)CX35-P800-C18I (S/N: PCF1-123; PCZ156-UP)Description Of Change: An improved milling process results in a better cylinder block surface deck finish on C15 and C18 Machine Engines. The improved cylinder deck surface helps prevent problems with blown head gaskets, coolant leaks, and liner seat erosion.Adaptable To: The following changes are effective with all products after the listed serial numbers.