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Home›Repair guides›Mercury Marine›Cleaning Flame Arrestor (Top Mounted)

Mercury Marine MCM 4.3L / MCM 4.3L EFI — Cleaning Flame Arrestor (Top Mounted)

Maintenance

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

Before you start

  • Gasoline is flammable; ensure ignition is OFF
  • NEVER use gasoline as a cleaning solvent

Procedure

  1. Remove flame arrestor cover.
  2. Remove crankcase ventilation hose from fitting on flame arrestor housing.
  3. Remove flame arrestor.
  4. Clean flame arrestor in solvent and blow dry with compressed air.
  5. Clean crankcase ventilation hose in solvent and blow dry with compressed air.
  6. Inspect hose for cracks or deterioration and replace if necessary.
  7. Reinstall flame arrestor and crankcase ventilation hose.
  8. Reinstall flame arrestor cover.

Tools required

Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.

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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