2007/08/27 Caterpillar

Engine:

3512B (S/N: 2AF1-UP; PWG1-UP; S2H1-UP; S2J1-UP; S2L1-UP; S2M1-UP; 7HM1-UP; 8EM1-UP; 4TN1-UP; 3ZW1-UP; 2EZ1-UP; BRC1-UP)

3516 (S/N: 3SS1-UP)

3516B (S/N: 8KN1-UP; S2S1-UP; S2T1-UP; CBN1-UP; S2Z1-UP)

Engine News SEBD9449, 25 June 2007, "An Improved Turbocharger Housing is Used". Disregard this article. Refer to the following article.

Description of Change: A new turbocharger group is now used on the above engines. The new turbocharger has a seal that is added between the turbine housing and the bearing housing in order to improve the sealing of the joint.

Adaptable To: The new turbocharger group is a direct replacement for the old turbocharger group. The new turbocharger groups are adaptable to the engines that are listed above back to first production. The new 289-4079 Seal is used on all of the turbochargers that are listed in Table 1 below.

Table 1

Part Numbers for the Turbochargers
Serial Number Prefix	Former Part Number for the Turbocharger Group	New Part Number for the Turbocharger Group	New Part Number for the Turbocharger Housing
S/N:2AF00676	188-4623	299-4611	294-7492
	188-4625	303-8128	289-4078
S/N:4TN00868	188-4623	299-4611	294-7492
	188-4630	289-0379
S/N:7HM00271	188-4623	299-4611
	188-4625	303-8128	289-4078
	178-3662	289-0384	294-4527
S/N:S2L00681	188-4623	299-4611	294-7492
	188-4630	289-0379
S/N:S2M00171	188-4623	299-4611
	188-4625	303-8128	289-4078
	178-3662	289-0384	294-4527
S/N:S2T00105	188-4623	299-4611	294-7492
	188-4626	289-0386	289-4078
S/N:BRC00168	188-4621	299-4614
S/N:2EZ00376
	176-3231	303-8128
S/N:8EM00546	188-4621	299-4614
	188-4630	289-0379	294-7492
S/N:S2H00315	188-4621	299-4614	289-4078
	188-4630	289-0379	294-7492
S/N:S2J00491	188-4621	299-4614	289-4078
	188-4624	289-0380	258-6591
	244-3125		174-7082
S/N:3SS00324	188-4621	299-4614	289-4078
S/N:8KN00588
S/N:S2S00309
S/N:CBN00494
S/N:S2Z00183
S/N:3ZW00832	188-4629	285-2057	297-2416
	247-7589
	272-8186	289-0383	174-7082
S/N:PWG00202	188-4622	289-8785	290-2484
	251-1277

Note: If a leak is suspected in a turbocharger, refer to Special Instruction, REHS2997, "Inspecting the Turbocharger for Exhaust Leaks".