2013/05/28 Caterpillar

Engine:

3508 (S/N: 68Z1-UP)

3508B (S/N: 5PS1-UP)

3508C (S/N: F1X1-UP)

3512 (S/N: 65Z1-UP)

3512B (S/N: PWG1-UP; 3ZW1-UP)

3512C (S/N: MLM1-UP; NJT1-UP; F2X1-UP; LLY1-UP)

3516 (S/N: 71Z1-UP)

3516B (S/N: BCK1-UP)

Engine News SEBD9872, 28 May 2013, "New Water Ferrules Are Available for 3500 Engine Cylinder Heads". The original article has been revised to add serial number prefixes 5PS, PWG, BCK, and F1X.

The new ferrules are available for replacement of the factory installed ferrules. The new ferrules have an improved metal insert design that will reduce rubber strain from compression.

Illustration 1	g03323558
(1) 420-0652 Water Seal Assembly (2) 420-0653 Water Seal Assembly

Note: The new seal assemblies (1) and (2) are not available in the rebuild parts kits. If ordering an engine single cylinder head rebuild kit, the new seals should be ordered separately and the old seals discarded. Updated single cylinder kits will be available at a later date.

The new and original part numbers used are listed in table 1.

Table 1

New Part Number	Original Part Number	Quantity
420-0652 Water Seal Assembly	325-1412 Water Seal Assembly	4
420-0653 Water Seal Assembly	325-1410 Water Seal Assembly	4

3500 Engines are effective as of 28March 2013 with the new water ferrules.