3500B Marine Propulsion Engines Auxiliary Water Pump - Inspect Caterpillar


Auxiliary Water Pump - Inspect
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1.1. Pumps with a Cover
2.1. Pumps with a Clamp

Refer to the Disassembly and Assembly Manual for the engine in order to perform the disassembly of the auxiliary water pump.

Impellers and seals require periodic inspection. Impellers have a service life that is limited. The service life depends on the engine operating conditions.

Inspect the components more frequently when the pump is exposed to debris, sand, or other abrasive materials. Inspect the components if the pump is operating at a differential pressure of more than 103 kPa (15 psi).

There are different types of pumps. Some pumps will have a cover that is bolted to the main pump body. Some pumps will have a clamp that holds the front part of the pump body to the main part of the pump body. The cover or the front part of the pump body must be removed in order to inspect the pump.

Pumps with a Cover



    Illustration 1g01136356
    (1) Plug
    (2) Bolt
    (3) Cover

  1. Remove plug (1) and drain the water out of the pump.

  2. Remove bolts (2) and cover (3).

  3. Inspect the priming impeller, the priming impeller wear plates and the impeller for wear or damage. Inspect the pump housing for wear, damage or buildup.

  4. Inspect the pump shaft and the impeller for excessive axial movement.

  5. If wear or damage is found, replace the components which are worn or damaged. Use the proper repair kit for the pump.

Pumps with a Clamp



    Illustration 2g01136382
    (1) Plug
    (2) Clamp
    (3) Clamp
    (4) Front part of the pump body

  1. Remove plug (1) and drain the water out of the pump.

  2. Remove the water line and clamp (2), if necessary.

  3. Loosen clamp (3) and remove the front part of the pump body (4).

  4. Inspect the impeller, the wear plates and the wear ring for wear or damage. Inspect the pump housing for wear, damage or buildup.

  5. Inspect the pump shaft and the impeller for excessive axial movement.

  6. If wear or damage is found, replace the components which are worn or damaged. Use the proper repair kit for the pump.

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