Edmunds Answers

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.

    Source: 

  • 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.

ADVERTISEMENT

Top Mazda 626 Experts View More

Rank Leader Points
1. zaken1 160
2. karjunkie 130
3. MrShift@Edmunds 90
4. kiawah 80
5. snowball2 60
6. amyalaska 40
7. sylvia 40
ADVERTISEMENT