Mazda Ticking Noise from Left Bank Cylinder Head

 

Mazda Ticking Noise

Left Bank Cylinder Head Makes Ticking Noise

Bank 1 is the side with #1 cylinder, Bank 2 is the side with #4 cylinder so.. bank 2 is closet to front of car or left side engine.




only a sensor that detects position of each cam and has no mechanical workings. sensor only to signal computer. now.. if? sensor is bad, it is possible for computer to get wrong signal thus altering the timing on that side and possible ticking when this happens.

here is the TSB for the problem. You need to remove valve cover , then remove the cam caps and reinstall them.


CAMSHAFT TICKING NOISE BULLETIN NOTE This bulletin supersedes the previous bulletins 01-032/06 issued on10/12/2006, and 01-031/07 issued on 07/13/2007. The APPLICABLE MODEL(S)/VINs information has been revised. APPLICABLE MODEL(S)/VINs
2001 - 2006 & 2008 Tribute 3.0L vehicle built Jan. 17, 2006 through May 31, 2007
2003 - 2008 Mazda6 3.0L
2002 - 2006 MPV 3.0L

DESCRIPTION

Some vehicles equipped with a 3.0L engine may exhibit a ticking noise from the left bank cylinder head while the engine is running at normal operating temperature.

MORE DETAILS:---
The Technical Committee offers the following information on a ticking noise on
2001-2003 Mazda 3.0L Duratec engines. 

This noise can easily be misdiagnosed as a lifter noise.

Tappet noise can be heard from the left cylinder head when the engine is at operating temperature. The camshaft cap, marked 8L on the left bank, not being properly fitted in the cylinder head may cause this noise. Because of this misalignment, the cap’s edge makes contact with the camshaft, resulting in a ticking noise.

To repair this noise, make sure the engine is at operating temperature. Remove the left side valve cover and loosen the bolts which hold the intake side camshaft cap marked 8L in place.
DO NOT REMOVE THE CAP FROM THE HEAD.

The use of a flat-bladed screwdriver will assist in pushing the camshaft cam toward the front of the engine for proper alignment. Once the cam is pressed in place, tighten it down to 72 in/lbs.

Use the table below to select the correct repair for the applicable model.

  Year/Model                     Proceed To:

2002-’06 MPV 3.0L         Repair Procedure A

2003-’08 Mazda6 3.0L    Repair Procedure B

2001-’06 Tribute 3.0L      Repair Procedure A
(built before Jan. 17, 2006)

2006 Tribute 3.0L            Repair Procedure B
(built after Jan. 17, 2006)  

2008 Tribute 3.0L            Repair Procedure B
(engine build date
before May 16, 2007)*

2008 Tribute 3.0L            Service bulletin procedure does not apply, refer to
(engine build date            workshop manual, section 01-01
after May 16, 2007)*           

Where To locate Engine built Date Details?

*Engine build date can be located on the left-hand cam cover engine label.

Repair Procedure A

Caution: Before attempting a repair on a 2001-’06 Tribute, confirm if the water pump pulley is driven by the intake or the exhaust camshaft. Be sure to use the correct repair procedure. The water pump on 2001-’06 Tribute vehicles built before Jan. 17, 2006 are driven by the “intake” camshaft pulley.

1. Verify that the water pump is driven by the intake camshaft pulley. See Fig. A1.

2. Turn on the engine.

3. Verify the customer concern by using a stethoscope and conventional diagnostics to isolate the sound. If the noise is coming from the left-hand valve cover area near cylinder #6, proceed to Step 4.

4. Turn off the engine.

5. Remove the left-hand valve cover.

6. Rotate the engine clockwise until cylinder #6 ­intake cam lobes are pointing up (valves are fully closed).

 See Fig. A/B2.

7. Remove all intake camshaft caps (do not remove the exhaust camshaft caps).

Note: The camshaft caps must be completely lifted off, and then set back into position. Loosening and retorquing the cap bolts is not sufficient.

8. Reinstall all camshaft caps and torque bolts (except cam cap 8L) in the sequence shown in 

Fig. A3 to 8 Nm (72 lb.-in.).

Fig. A3

9. Using a screwdriver positioned on each side of the top of cam cap 8L, apply hand pressure and shift the cam cap toward the exhaust side of the cylinder head. 

See Fig. A4.

10. While holding cam cap 8L in the shifted position, torque fastener #9 (inboard) first, to 8 Nm (72 lb.-in.), then torque fastener #10.

11. Reinstall the left-hand valve cover.

12. Verify the repair.

Repair Procedure B

Caution: Before attempting a repair on a 2006 Tribute, confirm if the water pump pulley is driven by the intake or exhaust camshaft. Be sure to use the correct repair procedure. The water pump on 2006 Tribute vehicles built after Jan. 17, 2006, are driven by the “exhaust” camshaft pulley.

1. Verify that the water pump is driven by the exhaust camshaft pulley. 

SeeFig. B1.

2. Turn on the engine.

3. Verify the concern by using a stethoscope and ­conventional diagnostics to isolate the sound. If the noise is coming from the left-hand valve cover area near cylinder #6, proceed to Step 4.

4. Turn off the engine.

5. Remove the left-hand valve cover.

6. Rotate the engine clockwise until cylinder #6 exhaust cam lobes are pointing up (valves are fully closed). See Fig. A/B2.

7. Remove all exhaust camshaft caps (do not remove the intake camshaft caps).

Note: The camshaft caps must be completely lifted off, then set back into position. Loosening and retorquing cap bolts is not sufficient.

8. Reinstall all camshaft caps and torque bolts (except cam cap 4L) in the sequence shown in Fig.

B3 to 8 Nm (72 lb.-in.).

9. Using a screwdriver positioned on each side of the top of cam cap 4L, apply hand pressure and shift the cam cap toward the exhaust side of the cylinder head. 

See Fig. B4.

10. While holding cam cap 4L in the shifted position, torque fastener #9 (inboard) first, to 8 Nm (72 lb.-in.), then torque fastener #10.

11. Reinstall the left-hand valve cover.

12. Verify the repair.