2007/10/22 Caterpillar

A New Spring Helps to Relieve Combustion Pressure {1550}

Usage:

Engine: G3516C (S/N: GSB1-UP; TJB1-UP; TJC1-UP; GZZ1-UP; RWA1-UP; DKR1-UP) G3516E (S/N: GAS1-UP; SLY1-UP; GHP1-UP) G3520C (S/N: MAD1-UP; GZJ1-UP; GZK1-UP; GZL1-UP; GZM1-UP; GZN1-UP; B9P1-UP; HAT1-UP; CWW1-UP; CWY1-UP; GDB1-UP; GHC1-UP; GHE1-UP; JBX1-UP; JBZ1-UP) G3520E (S/N: GZG1-UP; GZH1-UP; HAL1-UP; SXY1-UP; GHM1-UP; GHR1-UP)

Engine News SEBD9515, 22 October 2007, "A New Spring Helps to Relieve Combustion Pressure". Disregard the previous article, refer to the article that follows.

Description of Change: A garter spring is now available to improve the vent seal capability to relieve combustion pressure from the well below the ignition transformers. This improvement will help to prevent damage to the transformer due to excessive pressure.

The excessive pressure in the ignition well is due to combustion gas leakage which is caused by the following conditions:

Not replacing the spark plug gasket during maintenance
Dirty sealing surfaces
Leaking spark plugs

Combustion leakage may include the following indications:

Deformation of the ignition transformer case
Cracks and/or separations above or below the transformer flange
Moisture in the well under the transformer
Extensions deformed and/or melted

Note: Refer to Operation and Maintenance Manual, SEBU7681, "G3500C and G3500E Generator Sets" for the information on the inspection and maintenance of the spark plugs.

Adaptable To: The new 316-4262 Garter Spring is used with the existing 135-2651 Vent Seal .

When adding the 316-4262 Garter Spring, it is not necessary to replace the 135-2651 Vent Seal.

The improved design utilizes a garter spring to retain and restrict the movement of the vent seal when exposed to combustion gas leaks and pressures. This improves the capability of the vent seal to relieve pressure properly. Refer to Illustrations 1, 2, and 3.

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