Edmunds Answers



  • zaken1 09/29/10 9:39 pm PST

    From one retired mechanic to another; it would have been immensely helpful if you had mentioned whether this car has the I-4 or the V-6 motor in it.

    Lacking that information; the possible causes of this problem could be 1> The balancer on this car has a rubber cushion between the hub and the pulley: If that cushion has deteriorated, it can allow the pulley to rotate with respect to the keyway; which would place the mark in the wrong position, or 2> the balancer may have been forced on the shaft without sufficient care in aligning the key with the keyway; if the key sheared off during the balancer installation, the mark could end up anywhere, or 3> You used the wrong year or wrong engine model diagram showing the cam gear timing mark orientation at TDC; or 4> guessed incorrectly at the cam position by confusing the orientation of the intake cam with the exhaust cam; or 5> reversed the direction of the camshaft rotation in your mental image. On some DOHC motors, the cams do not necessarily rotate in the same direction as the balancer. 6> If this car has the V-6 motor; you might have used the wrong cylinder bank for # 1.


  • zaken1 09/30/10 8:00 am PST

    I was not specific enough about the # 1 cylinder location in my previous post. On the Mazda V-6; the # 1 cylinder is on the bank closest to the FIREWALL, on the end of the motor next to the timing belts. If you set it up like a GM motor, which has the # 1 cylinder on the opposite side; the mark on the damper would be 180 degrees off; and the motor would not run. Since the Mazda V-6 is an interference motor; there is a chance of a valve striking a piston when the motor is cranked with the cams out of time like this. So be very careful when you turn the cams to the correct position.


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