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Home›Repair guides›Mercury Marine›Filling and Bleeding Power Steering System

Mercury Marine MCM 3.0L — Filling and Bleeding Power Steering System

Maintenance

For the Mercury Marine MCM 3.0L, from the Mercury Marine service manual.

Applies to: General Motors MCM 3.0L / 3.0LX engine

Before you start

  • DO NOT operate engine without water supplied to seawater pickup pump or pump impeller may be damaged

Procedure

  1. With engine stopped, position drive unit straight back and remove fill cap/dipstick.
  2. Add fluid to bring level up to FULL COLD mark.
  3. Turn steering wheel back and forth to end of travel each direction several times, recheck level and add fluid if necessary.
  4. Install vented fill cap.
  5. Start engine and run at fast idle (1000-1500 RPM) until normal operating temperature, turning steering wheel end-to-end several times.
  6. Position drive unit straight back, stop engine, remove fill cap, allow foam to disperse, check level and add fluid to FULL HOT mark. Reinstall cap.
  7. Repeat if fluid is still foamy.

Specs & values

Source: Mercury Marine service manual. Steps and values are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.

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