Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Driveshaft Runout
2009 Ford Edge Sport, FWDSECTION Driveshaft Runout
- Install the suitable Dial Indicator Gauge with Holding Fixture. Rotate the driveshaft by turning the axle and measure the runout at the front, the center and the rear of the driveshaft.
- If the runout exceeds 0.89 mm (0.035 in) at the front or center, install a new driveshaft.
- If the front and center is within 1 mm (0.254 in), but the rear runout is not, index-mark the rear runout high point and proceed to Step 2.
- If the runout is within 0.89 mm (0.035 in) at all points, recheck for vibration at road test speed. If the vibration persists, balance the driveshaft. For additional information, refer to appropriate Driveshaft Balancing procedure.
- Index-mark the driveshaft to the pinion flange. Disconnect the driveshaft and rotate it 180 degrees. Reconnect the driveshaft. Recheck the runout at the rear of the driveshaft.
- If the runout is still over specification, mark the high point and proceed to Step 3.
- If the runout is within specification, check for the vibration at the road test speed. If the vibration is still present, balance the driveshaft. For additional information, refer to appropriate Driveshaft Balancing procedure.
- Excessive driveshaft runout can originate in the driveshaft itself or from the pinion flange. To find the source, compare the 2 high points previously determined.
- If the index marks are close together, within 25 mm (1 in), the driveshaft is eccentric. Install a new driveshaft.
- If the marks are on opposite sides of the driveshaft, 180 degrees apart, the slip yoke or pinion flange is responsible. Check the pinion flange runout. If the pinion flange runout exceeds specifications, a bent pinion is indicated.
- If the pinion flange and pinion runouts are within specifications, road test and check for the vibration at the road test speed. If the vibration persists, balance the driveshaft. For additional information, refer to appropriate Driveshaft Balancing procedure.
NOTE:
Circular pinion flanges can be turned in 90 degree or 1/4 increments. Half-round pinion flanges are limited to 2 positions.
RENDER: 1.0x
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.