3512B Marine Auxiliary Engines Caterpillar

Removal Procedure

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Illustration 1	g00928364

1. Loosen clamp (1). Remove the clamp and tube (2).

2. Loosen clamps (3). Remove both breathers as a unit.
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   Illustration 2	g00597465

3. Remove O-ring seals (4) from the valve covers. Discard the O-ring seals.
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   Illustration 3	g00928366

4. Remove two clamps (6). Remove both breathers from hose tee (7).

   Inspect the hose tee for cracks. If the tee is cracked, discard the old tee and obtain a new tee for installation.

5. Turn the breathers upside-down in order to inspect the condition of the breather elements.

   Clean the breather elements with clean, nonflammable solvent. If the breather elements remain contaminated after the cleaning, discard the breathers and obtain new breathers. Do not attempt to disassemble the breathers.

   Allow the breather elements to dry before installation.

Installation Procedure

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Illustration 4	g00928366

Note: Coat the rubber parts with clean engine oil or petroleum jelly in order to make installation easier.

1. Place clamps (6) over the parts of hose tee (7) that will receive breathers (5). Install the breathers into the tee. Tighten the clamps to 3.0 ± 0.5 N·m (27 ± 4 lb in).
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   Illustration 5	g00597465

2. Coat new O-ring seals (4) with clean engine oil. Place the O-ring seals on the valve covers.
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   Illustration 6	g00928364

3. Place clamps (3) around the parts of the breathers that will be attached to the valve covers. Install both breathers as a unit. Tighten the clamps.

4. Place clamp (1) on the part of the hose tee that will receive tube (2). Install the tube. Tighten the clamp to 3.0 ± 0.5 N·m (27 ± 4 lb in).