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This engine was produced since and was the biggest engine of the EJ family. It was widely applied in all main car models. Subaru EJ25 engine used the aluminum cylinder block with dry sleeves.

It is similar to the EJ20 cylinder block, but diameter of cylinders was increased to It contained the crankshaft with a piston stroke 79 mm. The rod length remained the same Due to all this it was possible to get 2. The timing system uses timing belt. The timing belt replacement is necessary for each 50, miles of mileage 90, km.

In pistons were modified, and power increased to HP. This motor was used for Subaru tillthen it was replaced by EJ engine. In the State of California you can find EJ engines, meeting the advanced environmental standards.

EJ differs in intake system, throttle body and the placement of idle air control valve and MAP sensor. Since Subaru started producing EJ engine. It improved its ecological index. Sincethey began to apply variable valve lift system i-AVLS, on the intake side. In this motor was slightly modified: it received lightweight pistons, changed intake ports, new plastic intake manifold, new spark plugs, improved i-AVLS system and lightweight exhaust system.

Now we will examine engines with DOHC heads. It is a direct successor of EJ25D and refers to Phase 2. The compression ratio was reduced to 8. Maximum boost pressure is Also there is EJ version with the increased intercooler and with maximum boost pressure It allowed to receive the power HP at 5, rpm. Its maximum boost pressure This is enough to get HP at 5, rpm. Because of this, power increased to HP at 6, rpm, and torque Nm at 4, rpm.Remember Me?

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ej25 engine diagram

Much time and effort has gone towards organizing these files so please be reasonable when choosing your files for download. Abusing these third party cloud hosting services only hurts the community. Don't ruin this for us all. We only provide links!

SOHC Subaru Timing Belt Replacement Procedure

If you find any issues with the linking system, mislabeled FSM's or links have gone down please PM chuckthefuk or rkrenicki Thanks for all contributing members. You know who you are. Since a lot of the old links had expired, I deleted all of the Megas from the list. I also deleted references to the broken picture links for flags and excess carriage returns. The new OP is about half the length of when I started. I need to see if I can track down some corrections to this list, as there were some errors.

This list really bothers me with the way it is laid out. It is quite improved now, but it is still a whole lot of white-space that isnt necessary. I have an idea of how better to sort it, but I need to play around with it offline before I put it into practice here. Originally Posted by rkrenicki. Thank you guys for the link! Thanks for this! All times are GMT The time now is AM. All rights reserved.Later, we learned it was because Magnus had assembled over of these engines while working at Cosworth Engineering.

At Subaru, the EJ engine remains one of the most popular platforms for motorsports use. While its direct-injection descendants FA-series may eventually become even more popular, the EJ will continue to be a favorite of enthusiasts for many years to come. All of the EJ short-block and long-block assemblies sold through Cosworth Engineering were built from brand new engine cases. Hence, Magnus had the opportunity to see over examples of what the Subaru factory produced.

Over percent of the new blocks supplied passed the QC check at Cosworth Engineering to eventually become a Cosworth Engineering shortblock or longblock. In a production environment, boxer engines are simply harder to manufacture at the same level of precision as an inline. However, matching the left bank to right bank pairs so that both are in perfect alignment exactly degrees opposed to each other is more of a challenge than just putting four cylinders in line.

With the EJ engine cases, the alignment of the main journals that support the crankshaft are never perfectly aligned. Typically, the alignment is off by about 0.

Subaru EJ22 Repair Manual

This misalignment may even be as high as 0. As a result, pistons may differ in deck height position by as much as 0. This creates a difference in compression ratio in different cylinders.

It is also likely that the main line for the crankshaft is also misaligned in the perpendicular plane.

ej25 engine diagram

Hence, the crank may be higher in the block near the front of the engine and lower near the back or vice versa. In addition to alignment challenges, the design of the main bearing housings of the EJ results in some inherent issues. The number two and number four main journals are thinner than the rest.

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When an EJ engine is abused overheating, detonation, extreme power levelsit is not uncommon to see the number two and number four bearing housings become oversized up to 0.

While many tuners often discard blocks with this injury, it is possible to remove this flaw through a line boring operation. Fortunately, there is a way to correct nearly all of the alignment issues with the EJ engine. This process starts by setting each case half in a fixture where measurements are taken to determine how much material will need to be removed from the mating surface in order to allow for a precision main line boring operation in a CNC mill.

In most cases only 0. Setup for the line boring operation requires dial indicating the top and bottom main bearing housings.A class action lawsuit was filed against Subaru of America SOA because of a defect within the engine manufacturing which could lead to premature engine failure.

It was settled by the Camden, N. Subaru is also extending the powertrain warranty up to an additional eight years on model years or up tomiles. Owners can file a claim here and it must be done by May 22, Your engine may not have failed, but one way to determine if you could be having a problem is if you begin to experience a slight decrease in power which could be a sign of major issues ahead.

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Here are the steps you should take. Who is eligible?

ej25 engine diagram

Visit Torque News homepage for more stories. Latest Automotive News. Performance Vehicles. Subaru News, Pricing and Reviews. Subaru WRX. Subscribe to Torque News on YouTube. Comments Christopher Gen My friends and I have on several Subarus over the years I have owned a WRX a WRX and have built the engine twice and now I own a Legacy GT all these problems stem from cylinder number 4 overheating and blowing out even the rod bearings go out on every Subaru model and even the ones with avcs the hoses always break and shatter.

Don't get me wrong I love Subaru but I wish there would be a better compensation or fix for the EJ series. John Mandel wrote on March 31, - pm Permalink. Any chance it extent to Forester xt or other xt models? Kathy Taylor wrote on November 17, - am Permalink. Currently having engine failure issues with my Forester XT and asking Subaru to provide a remedy.

How about the cars?? Kasey Taran wrote on June 22, - am Permalink. How do Canadians deal with this issue?

EJ25 Performance Engine Parts

Mike wrote on August 19, - pm Permalink. Have a bought 1 year ago with 23K miles. Rod blew at 30K. Subaru denied warranty because computer showed max rpm at 9K miles of and max mph of at 19K miles. Just wanting to know if I have any claim to fight this.

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Mathew Ickes wrote on September 7, - am Permalink. So if I own a sti that had engine failure is there nothing I can do. The car has had all maintenance and oil changes done on time with all the paperwork to prove it.Timing is something that freaks people out when they do it for the first time.

I know I was freaked out about it when I started work on my Subaru. But I found it quite strait forward once I got into it and hope my experience can help you out. Not true, I did it and my car is still running great. I know you are good enough to set the timing on your Subie too! Thus, this is a pretty detailed post as I tried not to leave anything out. So, get cozy. Also, if you have any questions or want to make a comment. Please leave one at the bottom.

The job of the timing belt is to position the valves correctly in relation to the pistons for intake of fuel and exhaust. So, when a timing belt is set in the incorrect position or wears outvalves can be smashed by the pistons and severe engine damage occurs. With most cars, timing is set to top dead center on number 1 piston. But on a Subaru with their funny horizontal boxer engine, it is set at mid-stroke.

For those not familiar, I will explain what that means later. This DIY post will explain the most minimal way to access the timing belt for doing a timing belt change. If you are already taking the engine apart for something like a head gasket job, you can ignore the first part of this post.

You will also probably want some power tools. The harmonic balancer is torqued to ft. A cordless impact wrench like the one in the middle is a very useful tool I would highly recommend for anyone doing much work on cars. I just got that wrench and wish I got it sooner. A butterfly wrench will, if you have one.

This blog is based on my experience working on an Legacy Outback, I know this procedure would be exactly the same for many other years of Legacys, and probably the same or very similar for many years of Foresters and Imprezas with a EJ25 SOHC.

Remove the plastic splash shield underneath, 5 x 12mm bolts underneath and 2 x 10mm screws in the wheel wells. Get a bucket or drain pan under the cock at the bottom right of the radiator.

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Get your big phillips screw driver out and loosen that cock up things are starting to get exciting already. Careful not to strip it, it is only plastic. Pull the cock out and drain your coolant. While the coolant is draining, remove the ram air intake. A couple of 10mm bolts in the radiator support bar.

Subaru FB25 2.5L Engine Review

I have a video on my Youtube channel which shows this in detail. Loosen the hose clamps on the radiator hoses and remove those too.

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You may have to wiggle and pry them a bit to get them loose. Get under the car and unplug the two hose fans, push the tab up in the clips with a flat head screwdriver to loosen them.

If you have an automatic transmission, there is probably a transmission cooler down there too, that will need to have the hoses disconnected. You can then lift the whole radiator out with the fans and bottle still attached. The bottom of the radiator is in a couple of rubber seats and might take a bit of pursuation to free from the car. Remove the drive belt covers.

Your engine will look something like this now. Except your power steering lines should still be attached. Label your drive belts with a paint marker, as illustrated, if you plan to reuse them.Subaru 2.

There are specific ways to test a Subaru 2. Under the hood of each car lies a series of complex components, some of which heat up in the process of powering the engine, and others that exist to counter these effects and prevent things from overheating. From the thermostat and fans to the radiator and coolant reservoir, each part relies on the other to keep the engine cool for safe driving.

Sometimes, however, things go awry, and a car experiences cooling problems that make it difficult — if not outright dangerous or impossible — to continue driving. Such has been the case with Subaru 2. With applications made abroad — including parts made by the Japanese automaker — the speed of the cooling fan is controlled by a pulse—modulated fan motor.

By way of contrast, in domestically made applications, fan speeds are activated by the powertrain control module. Either way, a fan can be diagnosed with the use of a code reader. As with other vehicles manufactured overseas, clogs can easily form in the cooling tubes of Subaru radiators due to very thin cross-sections. Despite the fact that most original equipment OE coolants are formulated to last beyond the k mileage mark, the anti—electrolytic additives can degrade and cause corrosion within the radiator.

Over time, pressure cycling can wear down the components of a cooling system. When pressure cycling occurs, coolant is forced by the radiator into the reservoir. When it does occur, however, one of the following symptoms is usually the cause: a cold system with gases trapped in a cold thermostat, or disappearing coolant with no apparent leakage.

When the system is cold, a head gasket leak could cause gasses to get trapped inside. With no way to escape from the closed thermostat, gas pressure can mount inside the engine and cause a reverse flow of coolant through the radiator and back to the reservoir.

When worse comes to worst, the reservoir overflows, the coolant is lost and the system overheats. The other symptom involves leakage with no actual evidence. In this situation, the coolant repeatedly needs replenishing, despite there being no trace of oil or fluid on the ground. The likely reason is that coolant is being sucked into the head gasket and ejected from the exhaust. Signs of this occurring include coolant residue on the spark plug insulator, which indicates that coolant has entered the cylinder; and milky brown engine oil, which would prove that the head gasket has leaked.

Another sign we talk to customers about all the time is white exhaust smoke. This indicates coolant loss via a cracked or warped cylinder head, a cracked engine block, or head gasket failure caused by severe or chronic overheating. To prevent this from happening, have your technician inspect your vehicle and explain that the coolant sensor and thermostat are properly calibrated. Furthermore, warm up and cool down the engine to test the reliability of the thermostat and sensor, and to vent any air that might be stuck in the cooling system.

In phase two 2. Models made before have been notorious for coolant leaks, which generally occur at the left—side gasket. The problem drew protests that prompted Subaru to extend its warranty plan and add an anti—leak cooling system conditioner. Like all cars, 2. As with head gaskets, the engine should be inspected by a technician during each oil change for evidence of leaks. It must be stated that gasket leaks can and do persist without the formation of spots on the driveway.

Subarus, in fact, are equipped with a fiber—lined pan underneath that captures and absorbs droplets of oil and coolant. During an inspection, the technician needs to check this pan to determine whether a leak has occurred since your last checkup.

Subaru WRX/STI 2.5L Engine Failure Lawsuit; What Owners Can Do Now

Internal failure can also cause head gasket leaks in a 2. This results from conflict between the cooling system and the combustion. Unfortunately, this type of leak often goes undetected at the early, reversible stages.The FB-series is an entirely new engine manufactured by Subaru.

The 2. The production of this engine started in The engine is full of innovations and modern technologies like small capacity version - the FB20 engine. The FB25 is built on the FB20 aluminum cylinder block. For achieving the more significant displacement, there are 94 bore cast iron sleeves, but the stroke is the same.

The thickness of cylinder walls is 3. The FB25 engine got new pistons for reducing the friction inside the block and getting down the compression ratio to The aluminum FB heads consist of two pieces - the cylinder head itself and the camshaft carrier. That allows a reduction in metal thickness and weight. The heads are DOHC with four valves per cylinder. There are roller rocker arms instead of lifters. The fuel injectors were moved to the cylinder heads also, and injection system became more complicated but more efficient.

Intake and exhaust valves and ports have been modified for better airflow. The all FB25 engines have maintenance free timing chains. The exhaust system was tuned and got new manifolds and diameters of tubes to improve catalytic converter warm-up and to give more performance for the engine. The engine was slightly modified in The manufacturer reduced the thickness of cylinder walls to 3.

The heads have been revised also. They got reshaped intake ports and new 36 mm intake valves. There are the new intake manifold and lightweight exhaust system. The FB25 engine is more responsive at lower engine speeds compare to EJ It has the same power but lower rpm and increased torque at lower rpm.

The fuel efficiency of the FB25 is a way better than the EJ These features make the new 2. The FB25 has no issues with high oil consumption instead of the FB The lifespan of the maintenance free timing chains and associated systems slider, tensioner, etc.

The engine is excellent and reliable; lifespan is aboutmiles. Home Subaru FB25 2. Subaru FB25 2. Engine Specs Manufacturer.

Production years.

ej25 engine diagram

Cylinder block material.