- Engine:
- 3508 (S/N: CAW1-UP; 68Z1-UP; 69Z1-UP; 70Z1-UP)
3508B (S/N: S2A1-UP; CBB1-UP; S2D1-UP; S2F1-UP; 2HW1-UP; BGX1-UP)
3512 (S/N: PTG1-UP; FDR1-UP; 65Z1-UP; 66Z1-UP; 67Z1-UP)
3512B (S/N: BLF1-UP; S2G1-UP; S2K1-UP; PTM1-UP; S2N1-UP; 1PW1-UP; 4AW1-UP)
3516 (S/N: RKT1-UP; GZX1-UP; 71Z1-UP; 72Z1-UP; 73Z1-UP)
3516B (S/N: BMB1-UP; LEK1-UP; CBN1-UP; S2P1-UP; GZT1-UP; S2T1-UP; S2W1-UP; 1NW1-UP; 2FW1-UP; GZY1-UP; S2Z1-UP)
Engine News SEBD9557, 9 August 2008, "New Cylinder Head Groups Are Used". Disregard the article. The article below is updated with new part numbers.
Description of Change: New cylinder head groups and assemblies are used for all engines that are listed above. The new head groups and assemblies include nitrocarburization of the valve seat inserts on the intake and exhaust valves. The nitrocarburization coating reduces the recession of the valves.
Note: No machining is allowed on the installed valve seat inserts or the coating will be removed.
Adaptable To: The new basic cylinder head groups and assemblies are now used for top end overhauls and for major overhauls on the engines that are listed above. The new basic cylinder groups and assemblies may be used individually in replacement of the former basic cylinder head groups and assemblies. The former cylinder head groups and the new cylinder head groups are listed in Table 1 and in Table 2. The part numbers of the former valve seat inserts and the new valve seat inserts are listed in Table 3. Table 4 lists the serial number effectivity of the new cylinder head groups.
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Table 1
| 3500B and 3500C Engines |
|
| Former Cylinder Head Group |
New Cylinder Head Group |
New Basic Cylinder Head |
Service Replacement Cylinder Head with Guides |
Reman Cylinder Head |
| 101-0830 |
299-3521 |
335-6220 |
299-3519 |
20R-0695
10R-8618 (1) |
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| ( 1 ) | Upgrade To New (UTN) |
Note: SIS Web may show the 10R-7765 Cylinder Head Gp instead of the 20R-0695 Cylinder Head Gp for the serial numbers prior to the effective serial numbers listed below. Use the 20R-0695 Cylinder Head Gp for the prior serial numbers of the effective serial numbers listed below.
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Table 2
| 3500 Engines |
| Former Cylinder Head Group |
New Cylinder Head Group |
New Basic Cylinder Head |
Service Replacement Cylinder Head with Guides |
Reman Cylinder Head |
| 4W-0095 |
299-3520 |
335-6217 |
299-3518 |
10R-8619 (1) |
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| ( 1 ) | Upgrade To New (UTN) |
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Table 3
| Part Numbers for Valve Seat Inserts |
| Valve Seat Inserts |
Former Cylinder Head |
New Cylinder Head |
| Intake |
130-2607 |
183-8809 |
| Exhaust |
130-2608 |
289-9745 |
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Table 4
| Effective Serial Numbers |
| S/N:1NW00162-UP |
| S/N:1PW00456-UP |
| S/N:2FW00424-UP |
| S/N:65Z01287-UP |
| S/N:69Z00914-UP |
| S/N:67Z02191-UP |
| S/N:68Z01311-UP |
| S/N:70Z01082-UP |
| S/N:71Z00427-UP |
| S/N:72Z00578-UP |
| S/N:S2A00136-UP |
| S/N:73Z00980-UP |
| S/N:BGX00129-UP |
| S/N:S2D00185-UP |
| S/N:2HW00384-UP |
| S/N:CBB00538-UP |
| S/N:S2G00117-UP |
| S/N:BLF00191-UP |
| S/N:CBN00468-UP |
| S/N:S2K00260-UP |
| S/N:BMB00132-UP |
| S/N:CAW00456-UP |
| S/N:S2N00122-UP |
| S/N:4AW01746-UP |
| S/N:FDR00334-UP |
| S/N:S2P00182-UP |
| S/N:GZT00147-UP |
| S/N:GZX00117-UP |
| S/N:S2W00112-UP |
| S/N:GZY00120-UP |
| S/N:LEK00131-UP |
| S/N:PTG00347-UP |
| S/N:PTM00636-UP |
| S/N:RKT00129-UP |
| S/N:S2F00124-UP |
| S/N:S2T00107-UP |
| S/N:S2Z00131-UP |