Steering - Identifying Rack and Pinion Noises
88pontiac08Bulletin Number: 88-3-22
Reference Number: 873206
Publish Date: 5/88
Subject: IDENTIFYING RACK AND PINION STEERING SYSTEM NOISES
Models
Affected: 1982-88 VEHICLES WITH RACK AND PINION STEERING
The increased activity in steering gear servicer due to Special Policy Bulletin 84-SM-35, has resulted in an increase in the number of comments regarding steering system related noises which can be heard inside the vehicle.
FIGURE 1:
When removing or installing any rack and pinion steering gear for service, be sure to inspect the intermediate steering shaft or steering coupling seal for cuts or tears which would allow noises to be transmitted into the passenger area. Also inspect the seal for being twisted, crushed or distorted as this can cause a clunk or rubbing sound. See Figure 1 for a typical Sunbird/Grand Am model seal. Replace the seal as necessary.
FIGURE 2:
On Sunbird and Grand Am models, check the upper portion of the steering coupling seal to be sure it is fully seated over the bushing or a noise path could be created. The seal is retained by the lip on the bushing. Refer to Figure 2. On 6000 and Bonneville models, check the seal to be sure it is securely fastened to the cowl and lower column..
FIGURE 3:
The center-take-off gears used on the Sunbird and Grand Am models, also use a dash seal which must be properly indexed on the housing before the gear is installed in the car. See Figure 3. If the dash seal is mispositioned another noise path can be created. A mispositioned dash seal could also cause a condition of stiff steering if the seal is rubbing on the steering coupling.
FIGURE 4:
When diagnosing a growl, ground out, or rattle noise on a Sunbird or Grand Am model, there is a possibility that one of the cylinder lines of the gear could be grounding out on the heater case on the right side of the cowl. See Figure 4. If this condition exists, bend the pipe away from the contact area to gain clearance.
All models are susceptible to having the power steering pump hoses lay against other components which could transmit steering system noises into the car. Hoses should be inspected to be sure they are not grounding out and creating a noise path.