2012/02/27 Caterpillar

Generator Set:

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

Engine News SEBD9726, 12 September 2011, "New Fuel Injector Lines Groups are Used for C175-16 Generator Set Engines". The original article was revised to change the points of measuring the bolts and the bolt lengths. Refer to the information below.

Description of Change: The new flange design has been released to improve the reliability of the sealing joints for the lines groups.

Adaptable To:

Illustration 1	g02905216
New verses old bolted flange design (1) Previous flange (2) New flange (A) Previous 291-5203 Bolt (bolt length 40 mm (1.57 inch)) (B) New 311-8193 Bolt (bolt length 45 mm (1.77 inch)

A new flange design has been introduced for the 304-9602 Fuel Injection Lines Gp and the 327-0844 Fuel Injection Lines Gp.

The newly designed lines groups incorporate new flanges (2) that are thicker than the previous flanges (1) that are found in the old lines group. The new bolt (B) for the thicker flanges are longer than the previous bolt (A) .

Note: The bolts for the lines groups cannot be interchanged. If the shorter bolts are used with the thicker flange, the thread engagement of the bolt will be insufficient. If the longer bolts are used with the thinner flange, the bolt will bottom in the threaded bolt hole before tightening. Ensure that you use the correct bolts for the lines group that you are installing.

Illustration 2	g02711286
Locations for the new flanges on the fuel lines groups (3) 327-0844 Fuel Injection Lines Gp (4) 304-9602 Fuel Injection Lines Gp

The 327-0844 Fuel Injection Lines Gp (3) utilizes two of the thicker flanges in the new design. The 304-9602 Fuel Injection Lines Gp (4) utilizes four of the thicker flanges in the new design.

Note: The 311-8193 Bolt is designed as a single use component. Ensure that the bolts that are removed from the engine are discarded promptly.Refer to the Disassembly and Assembly manual for installation instructions.

The new fuel lines groups became effective at the following serial numbers:

Table 1

Sales Model	Effectivity
Generator Set	WYB00252-Up

The following fuel line assemblies are available as line kit assemblies and are serviceable for the previous fuel lines groups:

Table 2

Assembly Part Number	Kit Part Number
341-6784 Fuel Line	363-7077 Fuel Lines Kit
341-6785 Fuel Line	363-7078 Fuel Lines Kit
341-6787 Fuel Line	363-7079 Fuel Lines Kit