2008/05/01 Caterpillar

Engine:

3406E (S/N: 2WS1-UP)

C-15 (S/N: 6NZ1-UP; 9NZ1-UP)

C15 (S/N: BXS1-UP; MXS1-UP; NXS1-UP)

Truck Engine News SEBD6808, 10 December 2009, "Improved Rings are Available for On-Highway Truck Engines with High Load Applications". Disregard this article. Refer to the article that follows.

An improved top piston ring has been released for engines that are used in high load applications. The improved top piston ring is made from stronger materials. The stronger materials have a proven robustness in order to withstand fatigue due to high load applications. For only the high load applications that are listed below, replace the 237-0194 Top Piston Ring with the 247-6130 Top Piston Ring on the piston prior to assembly in order to provide increased life. High load applications include coal and logging applications. High load applications also include any application with a Gross Vehicle Weight Rating (GVWR) that is equal to or greater than 63500 kg (140000 lb). Refer to Disassembly and Assembly, RENR2306, "C-15, C-16 and C-18 On-highway Engines,", Disassembly and Assembly, SENR9693, "C15 On-highway Engine" or Disassembly and Assembly, RENR9403, "C15 On-highway Engines".

Table 1

S/N	Hp rating	Normal load applications	High load applications
S/N:2WS1-UP	435-550	0R-8915	10R-8616
S/N:6NZ1-UP	435-550	0R-8915	10R-8616
S/N:9NZ1-UP	435-550	0R-8915	10R-8616
S/N:MXS1-UP	435-550	10R-3304	10R-6215
S/N:NXS1-UP	435-550	10R-3304	10R-6215
S/N:BXS1-UP	435-550	10R-3304	10R-6215

Replace the failed cylinder with a remanufactured cylinder pack. For the high load applications, refer to Table 1 when the cylinder packs are replaced. The remanufactured cylinder pack will require the 247-6130 Top Piston Ring. Replace the top ring on the remaining cylinders with the 247-6130 Top Piston Ring.