how to tell what model subaru i have
(Updated on July 6, 2020)
Some Subarus accept a reputation for eating head gaskets at a very low mileage. Where did this reputation come from?
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Though at that place was never an official Subaru caput gasket think, the problem is pervasive plenty where it can be expected that sure original head gaskets volition fail between 100,000 and 150,000 miles (160-241k kilometers).
This may sound similar a long time, just considering most Subaru owners like to keep their vehicles on the road upwardly of 250,000 miles, information technology'southward a pretty big bargain. On top of that, the repair is pretty expensive.
Years and Models Affected
The main problem years are 1996 through 2004. The well-nigh common engine to have head gasket failures is the naturally aspirated (not turbo) Subaru ii.v L iv cylinder engine, normally known equally the EJ25 motor.
The unmarried overhead camshaft (SOHC) variant experiences failures much more than ofttimes than the dual overhead camshaft design (DOHC). The SOHC motors can be identified by their single circular indent on each side of the engine. However, DOHC engines produced between 1996 and 1999 have also been known to leak.
The naturally aspirated EJ25 engine was used across Subaru's lineup and can be found in the non-turbo Baja, Forester, Impreza, Legacy, and Outback.
Head gasket failures are less mutual on the Subaru 3.0 and three.vi 50 H6 models similar the Tribeca. They are besides rare on the turbo models such as the turbo Baja, Impreza WRX, and Impreza WRX STI.
Symptoms of a Subaru Caput Gasket Leak
Many symptoms of a head gasket leak on a Subaru are very like to caput gasket leaks on other vehicles.
i) Oil Leak
A diddled caput gasket tin can manifest in several means. On first generation Outbacks and second generation Legacy models, the gaskets tend to leak externally. Yous may discover oil leaks betwixt the head and the cake of the engine.
two) Heater Blows Cold
Many Subaru cooling systems route their heater core in such a mode that the heater will blow cold air when yous have air in the heater core.
Assuming the cooling arrangement was bled correctly, air in the heater cadre is well-nigh always caused by a head gasket leak. This event is common on second generation Outbacks, as those leaks tend to be internal.
iii) Overheating
One of the telltale symptoms of a head gasket leak is an overheating engine. If your engine starts to overheat, pull over to allow it absurd down for a bit before y'all keep driving.
An overheated engine could cause more engine harm and a more expensive repair nib.
4) White Exhaust Smoke
If you notice a thick deject of white smoke out of the exhaust that persists afterwards initial startup, you probably have a caput gasket leak. Notwithstanding, just considering you don't observe excessive white smoke doesn't hateful you're leak free.
5) Foamy Oil Cap
Does the underside of your oil cap await like black coffee or a Starbucks Frappuccino? If it's the latter, that'southward a alert sign that coolant has leaked into the oil system.
Coolant and oil don't like to mix and often produce a milky cream when they come in contact.
vi) Bubbling in Overflow Reservoir
In that location should be no air in the cooling system. An overflow reservoir that bubbles while the engine is running is a certain sign that something isn't correct.
While you lot're in there, check to make sure the radiator cap is good, as a bad cap could comport similarly.
7) Hydrocarbons in Radiator
Hydrocarbons are produced when gases ignite in the combustion chamber. If you lot find these in the radiator, information technology could hateful your head gasket is leaking combustion gases into the cooling arrangement.
You lot may notice a burnt oil or fuel odor coming from the radiator or coolant overflow reservoir. If you notice this unusual odor, it may be a adept idea to have the cooling system tested as before long equally you can.
Head Gasket FAQ
What is a Head Gasket?
A head gasket provides the sealing surface between the cylinder head and the cake. This skinny part has a very difficult job. Information technology needs to keep coolant in the water jackets, oil in the oil passages, and combustion gasses out of the cooling system. It must do this job at a broad diversity of temperatures, from cold start to normal operating temperature.
Some head gaskets are a composite made out of other materials such every bit newspaper or graphite. Most modern caput gaskets are made out of multi-layer steel (MLS).
What Causes a Head Gasket Leak?
There is a lot of speculation on the exact cause of Subaru'due south widespread caput gasket leaks.
Some suggested causes have been low quality head gasket material, poor engine maintenance, bad head gasket design, bad water jacket design, detonation, improper head torque procedures, and electrolysis of the coolant due to poor grounding.
The true cause is probable some combination of these reasons.
How Can I Test My Head Gaskets?
At that place are several ways yous can test the integrity of your cooling system and combustion chamber.
A leak down test is a sure fire way to know if you have a head gasket leak. This exam will tell y'all if any combustion gases are able to escape into the cooling system, or elsewhere in the vehicle while the combustion chamber is supposed to exist sealed.
If yous come across bubbles coming from the radiator filler neck or overflow reservoir while performing a leak down test, you have a head gasket leak.
A radiator pressure level test ensures you lot have no leaks in the cooling system. This exam attaches to the radiator filler cervix and pumps the corporeality of pressure level your system is designed to hold. If the organisation won't concur pressure, you lot have a leak somewhere.
Radiator hydrocarbon examination kits will tell you if hydrocarbon deposits take made their way into the cooling system. Be enlightened that this exam could give y'all a fake positive if the head gasket has e'er leaked in the past, even if it has been repaired. You may besides get a fake positive if you've used a petroleum based additive in the radiator.
Practise Subarus Withal Have Head Gasket Issues?
Over the years the EJ25 engine's design was revised and gradually phased out. And then what year did Subaru fix this problem?
While there is no definitive "safety" year, head gasket leaks tend to exist much less common on newer models. If your Subaru is a 2012 or newer, odds are really good that you lot won't have whatever bug.
Can You Drive With a Blown Head Gasket?
Driving with a blown head gasket is not advisable. The longer the upshot persists, the worse it gets. Driving with leaky head gaskets will ultimately cause more than engine impairment and a higher repair neb in the long run.
In an emergency, leaky head gaskets volition probably not prevent you from driving the vehicle, especially if the leak is pocket-sized. Watch your coolant temperature gauge closely, as y'all will likely overheat the engine if y'all drive for an extended period of time.
Overheating an engine could warp the heads, rendering them unsalvageable. If the heads cannot be resurfaced, replacement heads will not exist cheap.
How Much Does a Caput Gasket Replacement Cost?
While replacement head gaskets are pretty cheap (effectually $100), the cost of labor is not. Repair estimates commonly exceed $i,500, depending on the extent of the impairment and what other maintenance is performed while the mechanic is in there.
Hold Up… Why Is This Then Expensive?
Since boxer engines are and then wide, many mechanics remove the engine entirely to perform this repair. Removing the engine makes information technology much easier to extract the caput bolts in detail, which are very long and won't clear the body with the engine sitting commonly inside the engine bay.
To reach the head gaskets, a mechanic has to tear the engine down to the short cake. Both gaskets are typically replaced at the same time. When one head gasket leaks, the other is ordinarily not far behind.
If your car is in the shop for a caput gasket repair, consider having them change the timing chugalug, water pump, idler pulleys, cam seals, both main seals, and the front transmission seal if you lot're not sure when they were last replaced.
Yous're probably not corking on adding cost to an already expensive repair neb, but these parts are relatively cheap and hard to admission normally. In that location's no better time to replace them, and you may finish upwards saving coin in the long run with this strategy.
Can I Practice This Job Myself?
Whether or not you lot can practice this task yourself depends on a number of factors. You lot will need to be honest with yourself about your own mechanical abilities, then weigh the pros and cons before diving in.
Estimated Downtime
If this is your daily driver and yous don't accept a fill-in vehicle, you probably won't desire to do this job yourself.
A head gasket replacement is very involved. It is non for the faint-hearted, and non something you tin tackle over a weekend.
To do the job right, you volition need to transport the heads off to a automobile store to be resurfaced. The lead time for this pace alone could be several days, perhaps more if the shop is busy. Consider budgeting extra time and money for a valve job if the valves have seen better days.
Required Tools
You will need some specialty tools you may not have, such every bit a torque angle guess and an engine crane (also known as a carmine picker). An impact wrench volition brand sure tasks much easier, such equally removing the crank pulley bolt.
A quality torque wrench is a must. You will besides need a socket set, plus several extensions and universal joint sockets to reach the bong housing fasteners. Don't forget the factory service transmission.
Follow the manufacturing plant service manual very closely. The head tightening sequence is quite unusual and the torque specs are not the aforementioned across all models.
You should exist able to purchase all of the necessary tools for less than the cost of taking the vehicle to a store, if y'all know what y'all're doing. As a bonus, it gives you lot a great excuse to convince your significant other that it's time to fill up your garage with some sweet new tools.
Other Considerations
Almost Subaru engines are interference engines, which ways the pistons are able to contact the valves if the engine is non timed correctly. This would cause enough damage to warrant a total engine replacement in the worst instance scenario. If you lot've never replaced a timing chugalug or this risk makes you uncomfortable, it's best to leave this job to a professional.
If you lot're interested in leveling up your home mechanic skills, picking up a cheap Subaru with a known caput gasket leak could give you an splendid learning feel. Earlier purchasing, brand certain you take the patience, funds for tools, and a clean, dry space to work. It'southward wise to grab a safe conscious buddy to aid you out if you're new to this blazon of thing.
Remember, few mechanics will be happy if your car shows up on a flatbed with a bunch of parts strewn about the interior considering y'all got yourself in over your head. Do lots of inquiry, and brand sure you tin actually commit to this job before you dive in on your own.
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Source: https://oards.com/subaru-head-gasket-problems/
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