4 Symptoms of a Rack and Pinion Leak
To most, a sudden oily spot on the driveway signals either a motor oil leak or transmission fluid leak. But the actual culprit could be power steering. Specifically, a leaky rack and pinion.
Learn to recognize symptoms of a leaking rack and pinion steering system, understand what causes it, and whether one of those “Stop Leak” products will actually fix it.
Signs of a Leaking Rack and Pinion
There are a number of tell-tale symptoms that often accompany the onset of a rack and pinion leak. While not all of these symptoms will be present in every case, they are prevalent enough to warrant mentioning.
The following are several of the most common symptoms associated with a leaking rack and pinion.
1) Oily Spots In Driveway
Power steering fluid collects quickly along the underbody of any vehicle with an active rack and pinion leak. This oil clings not only to the rack and pinion, but to any nearby components onto which it is blown. Then, when a vehicle is parked, gravity deposits this power steering fluid on the surface of the driveway or parking lot below.
Therefore, the sudden appearance of oily spots within one’s driveway serves as a reliable indicator that something is amiss. While a leaking rack and pinion might not be to blame, it is worthy of closer inspection.
2) Frequent Need to Top-Off Power Steering Fluid
As power steering fluid is lost through a leaking rack and pinion gasket, the level of fluid within the power steering system is depleted. The speed at which this fluid is depleted is directly dependent upon the severity of the leak itself.
In some cases, fluid might leak gradually over the course of months. In other, more severe cases, fluid loss can happen far more abruptly.
If you notice that your power steering fluid appears lower than normal during routine service, careful inspection of your vehicle’s rack and pinion will be in order. This is especially true if you have never noticed a low fluid condition in your vehicle’s power steering fluid reservoir in the past.
3) Unusual Noises When Turning
Another potential symptom of a rack and pinion leak is audible noise that occurs when turning from one direction to the next. This sound is often described as a hum or whine, and is generally caused by excessive power steering fluid loss. This loss of fluid causes the power steering system to aerate, leading to a host of unusual symptoms.
This disappearance of power steering fluid can occur at multiple points throughout the system. While fluid can be purged from damaged hoses or a faulty pump, the rack and pinion itself is also suspect. A careful inspection of the rack and pinion will assist you in narrowing down your search.
4) Tough Steering
In certain instances, a vehicle’s steering will be negatively impacted in the event of a rack and pinion leak. This generally occurs when an excessive amount of fluid has leaked from the system, allowing aeration to take place. Such difficulties might even be accompanied by a noticeable humming or whining, such as that described above.
In some instances, normal steering can be restored by simply topping off a vehicle’s power steering fluid. However, in more severe cases, steering might show no noticeable improvement, especially if overheating has occurred due to prolonged periods of operation in absence of ample fluid. In such cases, only a full replacement of a vehicle’s rack and pinion system will remedy the issue at hand.
Common Causes
Seal failure serves as the most prominent cause of power steering rack leaks. This stems from the fact that a vehicle’s rack and pinion is under extreme hydraulic pressure, presenting ample opportunity for leakage to take place. Simply put, the smallest of imperfections in any of a rack and pinion’s seals, will allow pressurized fluid to leak in abundance.
The typical rack and pinion assembly features three main seals, including one at the steering shaft inlet junction, and one at each outboard end of the assembly. Each of these three seals are known to leak in certain scenarios, especially with age and typical wear.
As time passes, the rubber composition of a seal begins to deteriorate. This deterioration often manifests as dry rot and cracking. Rubber seals can also dry and shrink, leading to concerns over unseating. In any event, the true extent of such damage is quickly revealed when exposed to high-pressure power steering fluid.
Is It Safe to Drive With a Leaking Rack and Pinion?
It is not advisable to drive with a leaking rack and pinion, nor is it considered safe to do so. The rack and pinion plays a pivotal role in the operation of a vehicle’s power steering system. Therefore, any serious rack and pinion related issue can prove quite aggravating, if not dangerous.
Any fluid leak from a vehicle’s rack and pinion poses the risk of eventual unit failure. As fluid is lost, hydraulic power within the rack and pinion itself is reduced. This will cause a vehicle’s steering to stiffen, requiring additional force to be exerted upon the steering wheel to negotiate turns.
Fluid loss can also cause rack and pinion overheating, in turn, leading to complete rack and pinion failure. This poses similar symptoms to those mentioned above, as all hydraulic-assisted steering is lost. Failure of this nature will also require complete rack/pinion replacement.
The main danger in driving a vehicle with a leaking rack and pinion, is that a sudden or unexpected loss of power steering can pose an enormous safety risk, especially if this were to occur at highway speeds. If a motorist does not possess the strength to manually steer their vehicle, a wreck will likely occur as the outcome of this situation.