Service Manual 5008330_55 HP MFE Routine Service [Spark Plugs]

Spark plugs should be removed and examined periodically. Replace worn, fouled or damaged spark plugs.

Use only recommended spark plugs with the correct gap setting.

• Remove spark plugs and inspect condition.
• Set spark plug gap on new, replacement spark plugs.
• Mark spark plugs for ground electrode orientation.
• Apply Electrical Grease to the ribbed portion of the spark plug ceramic and to the opening of the spark plug cover to prevent corrosion.
• Install spark plugs using “indexing” procedure.

Removal

Use a 5/8 in. spark plug socket to remove spark plugs.

Access to the lower spark plug requires temporary removal of the upper ignition coil. Disconnect rub ber mounting straps securing coil.

1. Coil mounting strap

Slide coil off of mounting screws and to the side to access spark plugs.

1. Spark plugs 007843
2. Coil mounting screws

Indexing

Spark plug indexing positions the ground electrode of the spark plug opposite the fuel injector nozzle.

Put an ink mark on the ceramic of the spark plug in line with the OPEN side of the ground electrode. This mark will be used to orient the spark plug with the OPEN side of the ground electrode facing the fuel injector.

1. Ink mark
2. Open side

Apply Triple-Guard grease to the gasket surface of the spark plug. Install spark plug and tighten to a torque of 15 ft. lbs. (20 N•m).

If the mark is in unshaded area do not tighten any more.

Spark Plug Indexing Diagram

1. Unshaded area
2. Shaded area

If the mark is in the shaded area, reset torque wrench to 30 ft. lbs. (41 N•m) and continue to turn until the mark is in the unshaded area.

If the mark does not reach the unshaded area before a torque of 30 ft. lbs. (41 N•m) is reached, the spark plug cannot be indexed for that cylinder. Try another spark plug and repeat the steps above.

FUEL AND OIL SYSTEMS

Routine replacement of filters reduces the possibility of foreign material restricting the incoming fuel or oil supplies.

Replacement filter elements are available through Evinrude/Johnson Genuine Parts.

Fuel Filter

Evinrude MFE 55 outboards are equipped with an in line fuel filter. Refer to Fuel Filter Service on p. 145.

1. Fuel filter

Oil Filters and Oil Reservoir

Perform visual inspections to identify oiling system leaks. Make certain the oil tank is filled and oil supply is not contaminated.