- Engine:
- 3406E (S/N: 2WS1-UP)
- C-15 (S/N: 6NZ1-UP; 9NZ1-UP)
- C15 (S/N: BXS1-UP; MXS1-UP; NXS1-UP)
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     |
An improved cylinder pack has been released for engines that are used in high load applications that are listed above. The improved cylinder pack contains a top piston ring that is made from stronger materials. The stronger materials have a proven robustness in order to withstand fatigue, due to high load applications. 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 63,500 kg (140,000 lb). For the high load applications, refer to Table 1 when cylinder packs are being replaced. Replace the top ring on the remaining cylinders with the 247-6130 Top Piston Ring .
Refer to Disassembly and Assembly, RENR2306, "C-15, C-16 and C-18 Truck Engines ", Disassembly and Assembly, SENR9693, "C15 On-highway Engine ", and Disassembly and Assembly, RENR9403, "C15 On-highway Engines ".