('03-'05) Replace engine? 2005 2.5x - Experiences with JDM EJ20 and EJ25? - Subaru Forester Owners Forum
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post #1 of 14 (permalink) Old 05-25-2018, 05:00 PM Thread Starter
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Talking Replace engine? 2005 2.5x - Experiences with JDM EJ20 and EJ25?

So I have two blown headgaskets, a broken water pump, and piston slap / knock in the first cylinder. 150k miles on this engine. Should I just find a used engine from a good seller on ebay and replace the engine? These used engines have less than 50k on them. It would probably cost about the same or less than having the shop take the engine out to do head gaskets, water pump, the knock, and the timing belt.

What engine does mine have? The EJ20?

Last, how difficult would it be to put the turbo version engine in? I know the headers and electronics would have to be changed. How big of a deal would that be? Thanks, I'm new here

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post #2 of 14 (permalink) Old 05-25-2018, 05:13 PM
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Yours has the EJ25 SOHC. Most ebay sellers hawk the JDM EJ20 engine as a replacement. I have one in my 03 Forester with manual transmission. Not sure how well they work with an auto. Easy swap, keep your intake manifold and swap drivers side cam gear and crankshaft and camshaft sensors. Most JDM sellers require you to install a new timing belt kit, water pump, thermostat and oil pump. If you have a manual transmission now is a good time to replace the clutch.

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post #3 of 14 (permalink) Old 05-25-2018, 05:23 PM Thread Starter
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Cool, so my shop shouldn't have a problem swapping in a EJ20 engine for the EJ25? What are the differences between the two engines? I have auto transmission. Thanks!
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post #4 of 14 (permalink) Old 05-25-2018, 05:54 PM
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I see you're new to the forum, so welcome to the forum from Oregon.

First, I believe the EJ20 produces a bit less power, compared to an EJ25.
More info here: Wikipedia - Subaru Forester

Quote:
<snipped> how difficult would it be to put the turbo version engine in? I know the headers and electronics would have to be changed. How big of a deal would that be?
This is a big project, which can get expensive if you don't have the skills to do the work yourself. Members that do this usually have the donor vehicle so parts can be swapped over.

Bobby...

['07 FSXT MODding Journal] ['03 X MODding Journal]

'07 FSXT - COBB Surgeline dyno stock Protune - Stage 1+
'03 X +AVO turbo kit = XT (son's)
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post #5 of 14 (permalink) Old 05-25-2018, 06:25 PM Thread Starter
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I'm moving out to Portland this summer! How much less power are we talking about? Also, should I just replace the headgaskets, waterpump, and timing belt before the new EJ20 even goes in?
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post #6 of 14 (permalink) Old 05-25-2018, 07:53 PM
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I believe the difference is 15 HP but not sure if the shift points on the EJ25 4EAT auto will work well with the EJ20. I have heard on those who have done the EJ20 swap into an auto Outback that its gutless. I don't notice it much since I have a manual transmission and can just shift at a bit higher RPM.

Check for dropped valve guides on your used engine before you do much else. If you have a dropped valve guide send the heads out for repair and do the head gaskets and timing gear/water pump. Reseal the oil pan (factory uses Fuji Bond)
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post #7 of 14 (permalink) Old 05-29-2018, 01:51 PM Thread Starter
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Experiences with JDM EJ20 and EJ25

I have an '05 with 150,000 miles. Blown head gaskets and piston slap / knock in the fourth cylinder. So instead of repairing this tired, old engine, I was looking at used JDM import motors from eBay - should I take the risk? I would prefer to swap in the JDM EJ203, but I've heard horror stories about issues with sensors and computers never quite working right. The EJ203 isn't prone to head gasket issues like the EJ25... I have a shop that can do my head gaskets and timing belt for cheap: $1800. What are your recommendations?

What are your experiences / thoughts with these engines?
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post #8 of 14 (permalink) Old 06-05-2018, 01:46 PM
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Same ask as Midwestroads above..

My 05 2.5X seems to have finally met the same fate at 170K. Something locked up and belt partly broke a few teeth at low RPM but still caused engine damage. Shop claims piston damage and misfiring, it starts but very low power. Would you mind sharing what you ended up doing? Did you buy a new engine - if so, where from , which specific engine and $ ?

MY'05 2.5X 4EAT, MY'02 OB LL Bean
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post #9 of 14 (permalink) Old 04-23-2019, 04:37 AM
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@michiganwoods What did you end up deciding with this project? I bit the bullet and bought an ej203 a few weeks back and have everything swapped over. I should be dropping the engine back in this weekend as long as the weather holds out. Everything (besides the drivers cam gear being way over tight on the 203) went really smoothly.
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post #10 of 14 (permalink) Old 04-23-2019, 05:43 AM
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If you guys, meaning anyone looking up this post, can do the motor assembly yourself it's not that expensive.

There is also a guy, I will have to find his link again, all he does is the ej 2.5's and ej20 turbo motors. He completely rebuilds them from the ground up and sells them with a warranty here in the U.S. When I was just poking around for my 99s I believe his rebuilt EJ 25 motors were $1500-1800. He uses the STI metal head gaskets so they are guaranteed against head gasket failure and come with either a 6 month or 1 year/certain mileage warranty.
I'll have to see if I can find his link again it's a mom and pop shop with really good reviews. I originally found him on my phone, but that was three or four phones ago...



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post #11 of 14 (permalink) Old 04-23-2019, 05:33 PM
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@Freakshow999 yeah mine has been pretty affordable thus far I maybe spent a grand and that's with buying an engine hoist and stand. It's been a great learning experience. There is a small place in traverse city Michigan that rebuilds subaru engines. https://www.ssisubiespecialists.com/ They do a great job and charge $2k ish for a 2.5 a friend of mine has one of their engines that he has put in 2 different foresters now.
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post #12 of 14 (permalink) Old 05-10-2019, 07:36 PM
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Quote:
Originally Posted by 353foz View Post
@Freakshow999 yeah mine has been pretty affordable thus far I maybe spent a grand and that's with buying an engine hoist and stand. It's been a great learning experience. There is a small place in traverse city Michigan that rebuilds subaru engines. https://www.ssisubiespecialists.com/ They do a great job and charge $2k ish for a 2.5 a friend of mine has one of their engines that he has put in 2 different foresters now.
I think this is the guy I was originally talking about. Obviously not for you, but for others that will end up on you thread!

Subaru Engines
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post #13 of 14 (permalink) Old 05-12-2019, 04:08 PM
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So for like to like engine swap, no additional engine tuning is required right?

I've only done performance builds but have never done a stock to stock swap so I'm not really sure.
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post #14 of 14 (permalink) Old 05-16-2019, 06:57 AM
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@parad1mg correct. I swapped my EJ251 with an Ej203. There was no tuning required, it runs like a champ with zero CELs. Just the swapping of the crank gear, drivers cam gear, sensors etc. With an 06 you just have to be more conscious of AVCS if your engine comes with it or not. This is just based on my experience, i'm by no means an expert.
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  Subaru Forester Owners Forum > Technical Forums and Vehicle Assistance > Engine and Exhaust > EJ25 - 2.5L Non-Turbo (1998-2010)

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