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Nissan Rogue Service Manual: Special Cautions to Ensure the Safe Disposal of Sodium-filled Exhaust Valves

Nissan Rogue Service Manual / Engine / Engine Mechanical / Precaution / Special Cautions to Ensure the Safe Disposal of Sodium-filled Exhaust Valves

Handling and disposal of sodium-filled exhaust valves requires special care and consideration. Under conditions such as breakage with subsequent contact with water, metal sodium which lines the inner portion of exhaust valve will react violently, forming sodium hydroxide and hydrogen which may result in an explosion. Sodium-filled exhaust valve is identified on the top of its stem as shown in illustration.

Special Cautions to Ensure the Safe Disposal of Sodium-filled Exhaust Valves

(A) : Identification mark of sodium-filled exhaust valve

DEALER DISPOSAL INSTRUCTIONS

CAUTION:

  1. Clamp valve stem in a vice.
  2.  The valve has a specially-hardened surface. To cut through it, first remove a half-round section, approximately 30 mm (1.18 in) long using air-powered grinder until black color is removed and silver color appears.

Dealer disposal instructions

(A) : Black color
(B) : Silver color
(c) : 47 mm (1.85 in)
(d) : 17 mm (0.67 in)

  1. Use hacksaw to cut through approximately half the diameter of valve stem. Make the serration at a point 40 mm (1.57 in) from the end of valve stem.

Dealer disposal instructions

(a) : 40 mm (1.57 in)

Dealer disposal instructions

  1. Cover the serrated end of the valve with a large shop towel (A).

    Strike the valve face end with a hammer, separating it into two pieces.

  2.  Fill a bucket, such as a 20 (5-1/4 US gal, 4-3/8 Imp gal) oil can, with at least 10 (2-5/8 US gal, 2-1/4 lmp gal) of water.

    Carefully place the already cut (serrated) valves into the water one-at-a-time using a set of large tweezers and quickly move away at least 2.7 m (9 ft).

Dealer disposal instructions

  1. The valves should be placed in a standing position as shown in the illustration to allow complete reaction. After the bubbling action has subsided, additional valves can be placed into the bucket allowing each subsequent chemical reaction to subside.

    However, no more than 8 valves should be placed in the same 10 (2-5/8 US gal, 2-1/4 lmp gal) amount of water. The complete chemical reaction may take as long as 4 to 5 hours.

    Remove the valves using a set of large tweezers after the chemical reaction has stopped. Afterwards, valves can be disposed as ordinary scrap.

A : Bucket [Such as 20 (5-1/4 US gal, 4-3/8 Imp gal) oil can]

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