Mechanics

SPARK PLUG DIAGRAM

1993 BMW 740

Engine Mechanical problem
1993 BMW 740 V8 Two Wheel Drive Automatic 180000 miles

i need to know how to replace the spark plugs on my 1993 bmw 740i. Please Help!
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Baja366
September 27, 2010.




http://www.2carpros.com/forum/automotive_pictures/12900_fo_157.jpg


Firing order 1 5 4 8 6 3 7 2

**REPLACING ALL SPARK PLUGS**

Switch off ignition.


http://www.2carpros.com/forum/automotive_pictures/12900_s1_68.jpg



Version 1: (acoustic cover screwed down)

Remove seal caps (1) and unfasten nuts (2).
Remove acoustic cover.


http://www.2carpros.com/forum/automotive_pictures/12900_s2_60.jpg



Version 2: (acoustic cover with press-stud fastener)

Open press-studs (1 ... 4) one at a time, at the same time lifting the acoustic cover slightly.
Once all four press-studs have been opened, remove the acoustic cover.

Installation Note : Position acoustic cover and press downwards until press-studs (1 ... 4) click into place.


http://www.2carpros.com/forum/automotive_pictures/12900_s3_5.gif



Remove sealing caps, unfasten nuts.
Remove cover from ignition coils.


http://www.2carpros.com/forum/automotive_pictures/12900_s4_7.jpg



Unfasten plug connection.


http://www.2carpros.com/forum/automotive_pictures/12900_s5_2.jpg



Unfasten screws on ignition coils.

Installation Note : Ground straps of cylinder head cover must be secured on ignition coils for cylinders 3 and 6.


http://www.2carpros.com/forum/automotive_pictures/12900_s6_2.jpg



Unscrew and remove spark plugs with special tool 12 1 171.

Installation Note :
*Tighten using special tool 12 1 171 and special tool 12 1 200 (torque limiter)
*Without special tool 12 1 200, not tightening torque.

Tightening torque = 30 - 33 Nm (22 - 24 ft lbs)

http://www.2carpros.com/kpages/auto_repair_manuals_alldata.htm

Rasmataz
Sep 27, 2010.