2009/03/23 Caterpillar

Generator Set:

C6.6 (S/N: SDA1-UP; N6D1-UP)

C4.4 (S/N: GLD1-UP; GLE1-UP; D4B1-UP; D4D1-UP)

Industrial Engine:

C4.4 (S/N: 4441-UP)

C6.6 (S/N: 6661-UP)

Description of Change: There have been a number of isolated instances on C6.6 and C4.4 engines regarding valve bridges. The valve bridge has not been seated on the top of the valves. The valve bridge has become dislodged during engine operation. This leads to issues with the engine. A number of valve bridges have become dislodged during the replacement of the electronic unit injectors. The solution to this issue is a new valve bridge. The new valve bridges have installed plastic shrouds. This will ensure that the valve bridge is held in the correct position.

Adaptable To:

Illustration 1	g01675514
Typical example

Illustration 2	g01675513
Typical example

The new 339-3397 Link (1) replaces the old 276-9227 Link (2) .

Note: The geometry of the old valve bridges is different from the new valve bridges.