Spark Plugs. TOHATSU BFT 115A, BFT 150A

36ZX1T120_EN.book Page 89 Tuesday, November 28, 2017 4:48 PM

DRAIN PLUG COVER

OIL FILLER CAP

MAINTENANCE

Spark Plugs

To ensure proper engine operation, the spark plug must be properly gapped and free of deposits.

UNDER

COVER

PUSH LEVER

9. Reinstall the oil filler cap securely.

Do not overtighten.

10. Install and lock the engine cover securely.

The spark plug becomes very hot during operation and will remain hot for a while after stopping the engine. Allow the engine to cool before servicing the spark plug.

See page 93 for instructions of handling the Iridium spark plugs

(optional parts).

LOCKING

LUG PROJECTION

8. Install the oil drain plug cover.

Push the lever of the oil drain plug cover in the direction pointed by the arrow mark of ‘‘LOCK’’, and install the oil drain plug cover so that the locking lug securely sets on the projection of the under cover.

Please dispose of used outboard motor oil in a manner that is compatible with the environment. We suggest you take it in a sealed container to your local service station for reclamation. Do not throw it in the trash or pour it on the ground.

Wash your hands with soap and water after handling used oil.

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MAINTENANCE

<Standard Spark Plug>

Recommended spark plug:

ZFR6K-11 (NGK)

KJ20DR-M11 (DENSO)

Use only the recommended spark plugs or equivalent. Spark plugs which have an improper heat range may cause engine damage.

<Inspection and Replacement>

1. Disconnect the battery negative (–) terminal.

2. Unlock and remove the engine cover (see page 40).

UNDER COVER

GROMMET

CLIP

CLIP (2)

IDLE PORT

UNDER COVER GROMMET

3. Remove the two clips from the upper part of the under cover grommet.

To remove the clips, raise the inner part of each clip with a screwdriver, then pull out the clips.

CLIP

UNDER

COVER

Do not try to remove the clip with force without raising the inner part of the clip. Otherwise, it can damage the clip and/or under cover.

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36ZX1T120_EN.book Page 91 Tuesday, November 28, 2017 4:48 PM

4. Fold down the upper part of the under cover grommet without removing it from the idle port.

SPARK PLUG COVER

IGNITION COIL

BOLT

MAINTENANCE

BOLTS

5. Remove the two bolts with the 6 mm hex wrench, and remove the spark plug cover.

6. Use a hex. wrench to remove the bolt holding the ignition coil. Move the ignition coil to a position that allows to remove the wire connector easily.

LOCK TAB WIRE CONNECTOR

7. Disconnect the wire connector from the ignition coil by pushing on the lock tab and pulling on the connector. Pull on the plastic connector, not the wires.

8. Remove the ignition coil by pulling it up slightly. Take care not to give an impact or drop the ignition coil.

Replace the ignition coil if dropped it.

SPARK PLUG

WRENCH

19 mm EYE

WRENCH

9. Use the spark plug wrench and 19 mm eye wrench to remove the spark plugs.

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MAINTENANCE

New plug Plug needing replacement

10. Inspect the spark plugs.

(1) If the electrodes are heavily

corroded or carbon-soiled,

clean with a wire brush.

(2) Replace a spark plug if the

central electrode is worn.

The spark plug can wear out in

different ways.

If the sealing washer shows signs of wear, or if the insulators are cracked or chipped, replace the spark plugs.

SIDE ELECTRODE

1.0 – 1.1 mm

(0.039 – 0.043 in)

SPARK PLUG TORQUE:

18 N·m (1.8 kgf·m , 13 lbf·ft)

SEALING

WASHER

If installing new spark plugs, tighten

1/2 turn after the spark plugs seat to compress the washers.

If reinstalling used spark plugs, tighten 1/8 – 1/4 turn after the spark plugs seat to compress the washers.

INSULATOR

11. Measure the plug gaps with a wire-type feeler gauge.

The gaps should be 1.0 – 1.1 mm

(0.039 – 0.043 in). Correct as necessary by carefully bending the side electrode.

12. Thread the plugs in by hand to prevent cross threading.

13. After the spark plugs are seated, tighten with a spark plug wrench to compress the washers.

The spark plugs must be securely tightened. An improperly tightened plug can become very hot and may cause engine damage.

14. Push the wire connector onto the ignition coil. Make sure it locks in place.

15. Install the ignition coil. Reinstall the bolt.

16. Repeat this procedure for the other three spark plugs.

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17. Reinstall the covers. When reinstalling the covers, make sure not to jam the wire harnesses in between the covers and engine case.

UNDER COVER

GROMMET

CLIP

UNDER COVER

Clip installation:

• Press the under cover grommet and under cover and be sure that they adhere closely to each other.

• Insert the clips with the inner part raised off, then push in the inner part securely until they click.

<Optional Parts: Iridium Spark

Plug>

Recommended spark plug:

IZFR6K11 (NGK)

SKJ20DR-M11 (DENSO)

Use only the recommended spark plugs or equivalent. Spark plugs which have an improper heat range may cause engine damage.

Installation and removal procedure of the Iridium spark plugs are the same as the standard spark plugs.

MAINTENANCE

These spark plugs have an iridium coated center electrode. Be sure to observe the following when servicing iridium spark plugs.

• Do not clean the spark plugs. If an electrode is contaminated with accumulated objects or dirt, replace the spark plug with a new one.

The cleaning of the iridium spark plugs consult with your serving dealer, unless the owner has the proper tools and is mechanically proficient.

• Use only a ‘‘wire-type feeler gauge’’ to check the spark plug gap if necessary. To prevent damaging the iridium coating of the center electrode, never use a ‘‘leaf-type feeler gauge.’’

The gaps should be 1.0 – 1.3 mm

(0.039 – 0.051 in).

• Do not adjust the spark plug gap.

If the gap is out of specification, replace the spark plug with a new one.

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