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| Acura Engine >> SNAPPING NOISE ON 90-91 1.8L ENGINES
Snapping Noise On
1990-91 Acura 1.8L Engines
The AERA Technical Committee has been advised of a snapping noise on
1990-91 Acura 1.8L engines. The best description for this noise is a sharp snapping sound, similar to the sound of spark plug wire arcing. The cause for this unusual noise is not obvious, but may be uneven cylinder head torque.
Inappropriate torque may permit the cylinder head to move as the engine reaches operating temperature. If this noise is detected and o other cause can be found, verify the cylinder head bolt torque with this procedure:
1. Allow the engine to completely cool and remove both camshafts.
2. In reverse sequence loosen cylinder head mounting bolts, one bolt at a
time, then torque each bolt immediately to 7 ft. lbs.
3. After all bolts have been tightened to 7 ft. lbs. in sequence, tighten all
bolts to 22 ft. lbs. Finally, advance the head bolt torque to 43 ft. lbs,
then 61 ft. lbs.
4. Reinstall the camshafts and adjust valve clearance to .006 for intake
valves and .007 for exhaust valves.
The AERA Technical Committee
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