2012/05/16 Caterpillar

Generator Set:

C175-16 (S/N: WYB1-UP)

Engine:

C175-16 (S/N: P6L1-UP)

Description of Change: Previously, the hollow dowels for the valve lifter housing were pressed into the housing. When the valve lifter group was removed, debris could enter the lubrication system through the holes in the cylinder block.

The hollow dowels for the valve lifter housing are now pressed into the cylinder block. The dowels stay in the block when the lifter group is removed in order to help prevent debris from entering the oil holes.

The holes for the dowels in the new housing assembly are larger than the holes for the original housing assembly. The dowels stay in the cylinder block when the new housing assembly is removed.

Adaptable To:

The new 397-4038 Valve Lifter Gp is now used in place of the previously used 357-4825 Valve Lifter Gp, which is not canceled.

The only differences between the two lifter groups are the housings. The part numbers in both lifter groups are listed in Table 1.

Illustration 1	g02984137
(1) 384-3712 Hollow Dowel (A) Dimension 12 ± 0.5 mm (0.47 ± 0.02 inch)

If a new lifter housing is needed for an engine built prior to the change, two new dowels must be pressed into the block. Obtain two 384-3712 Hollow Dowels for use with the new housing.

(A) Height of the dowel above the block ... 12 ± 0.5 mm (0.47 ± 0.02 inch)

Note: The use of a vacuum to catch debris during removal of the lifter housing is recommended.

Illustration 2	g02929871
(2) Holes in the valve lifter housing for the dowels.