Why do subarus throw rods?
Subarus are known for their reliability and durability, but they can sometimes experience a common issue known as "throwing a rod." This occurs when the connecting rod in the engine breaks, causing catastrophic engine failure. While Subarus are generally dependable vehicles, there are a few reasons why they may be prone to this problem.
Causes of Subaru Rod Failure
There are a few key reasons why Subarus may be more susceptible to throwing a rod compared to other vehicle makes:
- Boxer Engine Design - Subarus use a horizontally-opposed "boxer" engine configuration, which places the connecting rods under more stress than a traditional inline or V-shaped engine. This design can make the rods more prone to failure over time.
- Turbocharging - Many Subaru models, especially the performance-oriented WRX and STI variants, come equipped with turbochargers. The increased power and torque from turbocharging puts additional strain on the engine components, including the connecting rods.
- Oil Starvation - Subaru engines can be prone to oil starvation, especially when the vehicle is driven aggressively or at high RPMs for extended periods. Insufficient lubrication can lead to accelerated wear and eventual rod failure.
- Maintenance Neglect - Like any vehicle, Subarus require regular maintenance and inspections to catch potential issues before they become serious problems. Owners who neglect maintenance, such as changing the oil at the recommended intervals, may be more likely to experience a thrown rod.
While Subarus are generally reliable cars, the combination of their unique engine design, turbocharging, and potential for oil starvation can make them more susceptible to the dreaded "thrown rod" issue compared to other vehicle makes. Proper maintenance and driving habits are key to preventing this costly problem.
Why do EJ25 engines fail?
The EJ25 engine is an interference engine, meaning that if the timing belt fails, it can cause significant engine damage. The water pump is also a critical component that can fail and cause overheating. Replacing the timing belt and water pump at regular intervals is recommended to prevent these issues.
Why do subarus throw rod bearings?
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. Oil contamination or “dirty oil” causes little scratches or scoring on the bearings which impedes them from keeping a consistent oil film.
What is the biggest problem with Subaru engines?
One of the most notorious issues plaguing Subaru vehicles is head gasket leaks, particularly in older models with the EJ series engines. These leaks can lead to coolant loss, overheating, and potential engine damage if left untreated.
How many miles 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.
Why does Subaru have a bad reputation?
Issues such as engine problems, failing oxygen sensors, Takata airbag recalls, transmission concerns, and rodent-attractive wiring can affect various Subaru models.
How much does it cost to fix a thrown rod?
So, how much are engine rod repair costs? On average, expect to spend between $2,000-$3,000 for both parts and labor.
What year does Subaru have a bad engine?
The performance-oriented Subaru WRX and WRX STI from 2008 to 2014 unfortunately did not escape their own set of difficulties. These cars were plagued with engine problems. Such problems included bearing failure in the EJ series of engines, leading to a major engine rebuild or replacement.
What causes your engine to throw a rod?
A lack of lubrication can lead to the binding of piston rings as well as a heat build-up within a piston's skirt, which ultimately leads to thermal expansion. If oil starvation is severe enough, low oil pressure will result, causing excess wear to main and rod bearings.
Can a thrown rod be fixed?
The only solution is an engine rebuild where you pull the rods and replace the bearings. It's likely that the flailing rod damaged the crank journal surface, so you'll definitely need the crank polished and most like turned.
Why do Subarus have hood scoops?
Hood scoop functions
The high operating temperatures in the engine compartment result in intake air that is 28°C (82°F) or warmer than the ambient temperature and consequently, less dense. A hood scoop can provide the engine with cooler, denser outside air, increasing power.
