2011/06/06 Caterpillar

A New Flywheel Housing Cover Group Is Used on C175-16 Generator Set Engines {1157}

Usage:

Generator Set: C175-16 (S/N: WYB146-UP)

Description of Change: The previous covers used a gasket sealant. The new covers use O-rings seals that provide a better seal.

Adaptable To: The new 340-6965 Flywheel Housing Cover Gp replaces the 249-3999 Flywheel Housing Cover Gp in C175-16 Generator Set Engines. The 249-3999 Flywheel Housing Cover Gp is not canceled.

The new 340-6965 Flywheel Housing Cover Gp includes a new 322-2776 Cover and a new 322-2777 Cover. Each of the new covers uses one 2R-0239 O-Ring Seal .

The new 340-6965 Flywheel Housing Cover Gp is adaptable to C175-16 Generator Set Engines back to (S/N: WYB146-UP). The generator sets with lower serial numbers do not have enough material on the flywheel housings to accept the covers with the O-ring seals.

The new cover group is effective with engines built beginning 1July 2011.

Rework Procedure

Required Tools

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Table 1
Required Tools
Metric wrench set
Metric socket set
Gasket scraper

Procedure

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Illustration 1	g02584077

Remove heat shield (1) from above engine speed/timing sensors (2) and (3). Disconnect the sensor wires.

Remove cover (4) and the engine speed/timing sensors as a unit from the top surface of the flywheel housing.

Clean the old gasket sealant from the top of the flywheel housing.

Move the engine speed/timing sensors from the old cover to the new cover.
Torque for the engine speed/timing sensors ... 28 ± 7 N·m (21 ± 5 lb ft)

Use grease to keep the 2R-0239 O-Ring Seal in place under the new cover. Install the cover and the engine speed/timing sensors as a unit onto the flywheel housing.
Standard torque for the cover bolts ... 55 ± 10 N·m (41 ± 7 lb ft)

Reconnect the wires for the engine speed/timing sensors. Install the heat shield.

Remove cover (5) from the face of the flywheel housing.

Clean the old gasket sealant from the face of the flywheel housing.

Use grease to keep the 2R-0239 O-Ring Seal in place under the new cover. Install the cover onto the flywheel housing.
Standard torque for the cover bolts ... 55 ± 10 N·m (41 ± 7 lb ft)