Why do Subaru rod bearings fail?
As an experienced auto service provider, I often encounter questions about specific vehicle issues. One common concern among Subaru owners is the failure of rod bearings. Understanding the reasons behind this problem can help you take preventive measures and ensure the longevity of your vehicle. In this article, we will explore the primary causes of rod bearing failure in Subaru vehicles.
Understanding Rod Bearings
Rod bearings are crucial components in an engine, allowing the connecting rods to rotate smoothly around the crankshaft. They are designed to withstand high levels of stress and friction, but various factors can lead to their premature failure.
Common Causes of Rod Bearing Failure
- Oil Starvation: One of the leading causes of rod bearing failure is insufficient lubrication. If the oil level is low or if the oil is dirty, it can lead to inadequate lubrication, causing the bearings to wear out quickly.
- Overheating: Excessive heat can damage the bearings. This can occur due to a malfunctioning cooling system, leading to engine overheating and subsequent bearing failure.
- Manufacturing Defects: In some cases, rod bearings may have manufacturing defects that make them more susceptible to failure. This can include issues like improper material composition or poor machining.
- High RPM Operation: Subaru engines, particularly those used in performance models, may experience high RPMs that put additional stress on the rod bearings. Continuous high RPM operation can lead to premature wear.
- Improper Installation: If rod bearings are not installed correctly during maintenance or repair, it can lead to misalignment and increased wear, ultimately resulting in failure.
Signs of Rod Bearing Failure
Being aware of the signs of rod bearing failure can help you address the issue before it leads to severe engine damage. Look out for the following symptoms:
- Unusual knocking or tapping noises from the engine
- Decreased engine performance
- Oil pressure warning light activation
- Increased engine temperature
Preventive Measures
To minimize the risk of rod bearing failure in your Subaru, consider the following preventive measures:
- Regularly check and maintain proper oil levels.
- Change the engine oil and filter according to the manufacturer's recommendations.
- Monitor engine temperature and address any cooling system issues promptly.
- Avoid prolonged high RPM driving unless necessary.
- Ensure that any engine repairs or maintenance are performed by qualified professionals.
In conclusion, understanding the causes of rod bearing failure in Subaru vehicles can help you take proactive steps to protect your engine. Regular maintenance and attention to warning signs are key to ensuring your vehicle runs smoothly for years to come.
Frequently Asked Questions
What are common faults in Subarus?
Here are some of the most common Subaru problems to look out for:
- Damaged bumper.
- Fast battery drain.
- Dings and dents.
- Broken fuel pump.
- Starlink issues.
- Cracked windshields.
- Sudden unintended acceleration.
- Electrical issues.
Does Subaru have wheel bearing problems?
Yes, it is quite common in modern Subarus to need new wheel bearings more frequently than many other vehicles. Most chalk it up to the suspension geometry since most Subarus are built to have a higher than normal ride height.
What causes Subaru rod bearing failure?
Why Do Rod Bearings Commonly Fail on Subarus? Well… it all has to do with oil, the oiling system, and the general small surface area of Subaru rod bearing.
Why do engine rods fail?
Simply put, lighter-weight rods may not be able to handle the increased stress and vibrations, leading to bending or breaking under pressure. On the other hand, using overly heavy rods can increase the reciprocating mass, negatively impacting engine response and potentially causing fatigue failure over time.
Why are my wheel bearings going bad?
What causes a wheel bearing to become worn? Friction can never be truly eliminated, only reduced, and over time wheel bearings themselves wear out, though the most common reason for wheel bearings to fail is that their seals let the grease out, and water and grit in, damaging the balls and tapers.
How long do Subaru wheel bearings last?
100,000 miles
Your best bet is to consult your local experts and get the best Subaru wheel bearing out there, which, although more expensive, will last you for another 100,000 miles or more.
What is the life expectancy of a rod bearing?
The original rod bearings should be replaced every 60-80,000 miles, especially on vehicles which followed BMW's 15,000-mile oil change recommendation.
What is the number one cause of bearing failure?
1. Improper Lubrication. This should be one of the first reasons considered when inspecting a bearing that has failed. To ensure proper lubrication, adequate viscosity at operating temperature is a must.
What causes a rod bearing to go bad?
Lack of lubrication, dirt build-up, and corrosion can damage an engine rod bearing. Overlay fatigue can also wear out your ride's rod bearing. Using sab-par oil and assembly errors can also cause a rod bearing to fail.
Why do subarus throw rods?
Most thrown rods I've seen on well maintained vehicles are due to consumption issues that are all too common on subaru engines. People don't check the oil as frequently as what is responsible for a subaru, and the bearings end up getting starved.
