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Old 09-06-2022, 02:12 PM   #1
BipBoby
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Default EJ255 block - scratched surface

This is my EJ255 block - https://imgur.com/a/dF71gzP
The parts where crankshaft touches the block are scratched. Motor has 170k miles, it's been neglected and overheated. I can feel the grooves with my finger, but they don't seem to be terrible.

Can I reuse that case? Should I polish the surface somehow? What do you think?
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Old 09-07-2022, 07:16 AM   #2
rtv900
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Quote:
Originally Posted by BipBoby View Post
The parts where crankshaft touches the block are scratched.
^what does this mean?

you mean the main journals???? the pic doesn't show anything
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Old 09-07-2022, 08:11 AM   #3
undyjr
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I think he's talking about where the crank's counterweights scratched the case halves under the main bearings.

OP: How did the thrust bearings look?
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Old 09-07-2022, 09:40 AM   #4
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the crank doesn't touch the cases/block

if it did things are not going well and everything is trash

overheated cases are trash

read engine building books , watch youbtoob videos , join subaru specific engine groups on facetrash/twatherd and READ first ask later , talk to a machine shop , volunteer at a machine shop , take the engine to a local tech school , research engine building , go to car shows and talk to the old guys about engine building , edumacate yourself , do work as in time and effort

the multiple threads you are starting are all basic engine 101 subjects , i get that you have to start somewhere and i'm all about helping others but not if you can't put effort into helping yourself , asking for a spoon feeding of info one little tidbit at a time is not good and shows that you are putting zero actual effort into the questions you are asking and simply want the answers handed to you , even more obvious is you simply start a new thread rather than searching here or even goo ogle

frankly , judging by the questions you are asking , YOU ARE WELL OUT OF YOUR WHEELHOUSE AND IF YOU PLAN ON ASSEMBLING THE ENGINE YOURSELF I BET A DOLLAR IT DOESNT COME OUT VERY GOOD

these engine are "sensitive" to "billy bob backyard b/s hack jobs" , be careful

do you have the needed tools to measure /blueprint/assemble an engine ?

are you now going to ask what tools are needed ?


sorry if i come off as harsh but i'm sure i'm getting my points across crystal clear

good luck with your build
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Old 09-07-2022, 09:51 AM   #5
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Quote:
Originally Posted by motorbykemike View Post
the crank doesn't touch the cases/block

if it did things are not going well and everything is trash

overheated cases are trash

read engine building books , watch youbtoob videos , join subaru specific engine groups on facetrash/twatherd and READ first ask later , talk to a machine shop , volunteer at a machine shop , take the engine to a local tech school , research engine building , go to car shows and talk to the old guys about engine building , edumacate yourself , do work as in time and effort

the multiple threads you are starting are all basic engine 101 subjects , i get that you have to start somewhere and i'm all about helping others but not if you can't put effort into helping yourself , asking for a spoon feeding of info one little tidbit at a time is not good and shows that you are putting zero actual effort into the questions you are asking and simply want the answers handed to you , even more obvious is you simply start a new thread rather than searching here or even goo ogle

frankly , judging by the questions you are asking , YOU ARE WELL OUT OF YOUR WHEELHOUSE AND IF YOU PLAN ON ASSEMBLING THE ENGINE YOURSELF I BET A DOLLAR IT DOESNT COME OUT VERY GOOD

these engine are "sensitive" to "billy bob backyard b/s hack jobs" , be careful

do you have the needed tools to measure /blueprint/assemble an engine ?

are you now going to ask what tools are needed ?


sorry if i come off as harsh but i'm sure i'm getting my points across crystal clear

good luck with your build
Uncle Scotty is that you?
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Old 09-07-2022, 12:16 PM   #6
undyjr
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Old 09-07-2022, 02:11 PM   #7
BipBoby
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Quote:
Originally Posted by undyjr View Post
I think he's talking about where the crank's counterweights scratched the case halves under the main bearings.

OP: How did the thrust bearings look?
Yes, crankshaft's counterweights scratched the case flat surfaces right below main bearings. I noticed that other engine builders sometimes have similar scratches, perhaps that's all normal and ok?

Here are the bearings: https://i.imgur.com/PwI1jC1.jpeg

Quote:
Originally Posted by rtv900 View Post
^what does this mean?

you mean the main journals???? the pic doesn't show anything
Not the main journals, the counterweights scratched the case.
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Old 09-07-2022, 02:35 PM   #8
BipBoby
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Quote:
Originally Posted by motorbykemike View Post
the crank doesn't touch the cases/block

if it did things are not going well and everything is trash

overheated cases are trash

(...)
good luck with your build
Crankshaft counterweights had to touch the case, how else would it be scratched? I'm assuming it's normal since you didn't spot anything unusual on the picture I attached.
I have the guts out, I'm going to have to put it back somehow. I'll do the best I can and hope it doesn't blow up in the end.
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Old 09-07-2022, 08:06 PM   #9
motorbykemike
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Quote:
Originally Posted by cboggess View Post
Uncle Scotty is that you?


not quite
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Old 09-07-2022, 08:13 PM   #10
motorbykemike
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Quote:
Originally Posted by BipBoby View Post
Crankshaft counterweights had to touch the case, how else would it be scratched? I'm assuming it's normal since you didn't spot anything unusual on the picture I attached.
I have the guts out, I'm going to have to put it back somehow. I'll do the best I can and hope it doesn't blow up in the end.

subaru cases often "appear" that way but the way they are machined gives that illusion

can you push the crank forward and back when it was still assembled ?

how much ?

did you measure it ?

did the counterweight actually touch , not look like it may have , but actually verified that there was contact ?

the pics no worky for me

it would suck if it killed itself , maybe seek an experienced subaru engine assembler to do it with you , pay attention , measure everything and record , repeat


once again , overheated subaru motors go in the trash as far as i'm concerned
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Old 09-08-2022, 10:21 AM   #11
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Liston to Mike, he knows what he is talking about. New case halves are cheap and yes over heated case halves are trash most of the time, you might get lucky but I wouldn't take that risk. If the counterweights touched the cases that eng would have blown and seized. Most of the time those marks are from debris in the oil getting in between the case and the crank spinning over and over.
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Old 09-08-2022, 02:13 PM   #12
BipBoby
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Quote:
Originally Posted by BlackFighter View Post
(...) and yes over heated case halves are trash most of the time, you might get lucky but I wouldn't take that risk.
Can you elaborate why they are trash? I'm happy to inspect my case but it doesn't appear to be trash. The only thing that I see wrong with it is warped head surfaces - I can machine those.

Somebody locally sells discontinued IAG Stage 3 Block that I could get for $4-$5k. But it is for W25 heads and I have B25 heads, not sure if my heads would be compatible with that short block.
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Old 09-08-2022, 02:34 PM   #13
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Quote:
Originally Posted by BipBoby View Post
Can you elaborate why they are trash? I'm happy to inspect my case but it doesn't appear to be trash. The only thing that I see wrong with it is warped head surfaces - I can machine those.

Somebody locally sells discontinued IAG Stage 3 Block that I could get for $4-$5k. But it is for W25 heads and I have B25 heads, not sure if my heads would be compatible with that short block.
Subaru cases are a floppy bag of aluminum that just holds in the guts. They move about quite a bit, and a ridiculous amount when overheated. If you were to take that block and reuse it you will need to do at a minimum the following:

Bore and hone (WITH torque plates)
Line bore
Deck

Even though it's only 3 things to do them well will cost you about as much as a brand new empty case.

That IAG block will work just fine with B25 heads.
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Old 09-08-2022, 05:39 PM   #14
BipBoby
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Quote:
Originally Posted by cboggess View Post
Subaru cases are a floppy bag of aluminum that just holds in the guts. They move about quite a bit, and a ridiculous amount when overheated. If you were to take that block and reuse it you will need to do at a minimum the following:

Bore and hone (WITH torque plates)
Line bore
Deck

Even though it's only 3 things to do them well will cost you about as much as a brand new empty case.

That IAG block will work just fine with B25 heads.
I see your point. Flatironstuning sells new empty case for almost $1500 (including shipping & tax).
https://www.flatironstuning.com/suba...mpty-ej257-sti

I could bore and hone my case with torque plates and deck for total approx $500-$600 locally. Not sure about line bore.
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Old 09-08-2022, 06:43 PM   #15
benflynn
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Overheated can mean so many things. To me it means cooling system failure but not necessarily it was driven hot. Overheated meaning it went past the every other time temp gauge position, or overheated it was driven till it stopped.

Some would say every used block needs those same 3 jobs done. I say if you do it cheap, keep it real cheap so if it explodes you learn a cheap lesson.

If you do it up send it to get closed and rods/pistons +2 from flatirons
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Old 09-08-2022, 08:00 PM   #16
Elbert Bass
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You mean that roughness on the side of the main bearing webs? That is how Subaru machines EJ cases. You don't see corresponding scratches on the counterweights do you? Doesn't have to be pretty, just has to cut out enough so the counterweights DON'T rub.
Looking at your rear main I do not see enough wear in the front side thrust to allow counterweights to rub the main webs.
You're seeing a problem that does not exist. These are not indy car engines - you won't see pretty and polished where it is not needed.
Look at these:

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Old 10-03-2022, 06:58 AM   #17
whiterabbitrexy
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Quote:
Originally Posted by BipBoby View Post
This is my EJ255 block - https://imgur.com/a/dF71gzP
The parts where crankshaft touches the block are scratched. Motor has 170k miles, it's been neglected and overheated. I can feel the grooves with my finger, but they don't seem to be terrible.

Can I reuse that case? Should I polish the surface somehow? What do you think?

I have two ej20 blocks with thoes two cranshaft gashing on the mains side....its normal because i see all ej20 blocks have them...guessing the same for ej25... i would guess it is where the crankshaft balancing plates come thru there on a rotation.



its ture to do a block rebuild properly you need to do alot of reading and a **** load of expensive tools to have 100% success.... be patient and you'll be fine.
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