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

Mercury Marine MCM 4.3L / MCM 4.3L EFI — Filling and Bleeding Power Steering System

Maintenance

For the Mercury Marine MCM 4.3L / MCM 4.3L EFI, from the Mercury Marine service manual.

Before you start

  • DO NOT operate engine without water supplied to seawater pickup pump

Procedure

  1. With engine stopped, position drive unit straight back and remove fill cap/dipstick.
  2. Add Quicksilver Power Trim and Steering Fluid or Dexron III ATF to FULL COLD mark.
  3. Turn steering wheel to end of travel in each direction several times.
  4. Recheck fluid level and add fluid if necessary.
  5. Install vented fill cap and tighten securely.
  6. Start engine, run at fast idle (1000-1500 rpm) to normal temperature, turning wheel lock to lock.
  7. Stop engine; allow foam to disperse; check level.
  8. Add fluid to FULL HOT mark; do not overfill; repeat if fluid still foamy.

Specs & values

  • Use only Quicksilver Power Trim and Steering Fluid or Dexron III ATF
  • Fast idle 1000-1500 Amazon eBay rpm

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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