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2.5 engine comparability

Featured Replies

Will a 2000 outback wagon 2.5 sohc engine directly swap into my 2002 Impreza outback sport wagon with a 2.5 sohc? Or is there plug and play issues?

if you swap the drivers side cam sprocket and the crank sprocket - yes.

since the timing belts are way over due (or sat for awhile/questionable in a used engine ) they should be replaced anyway and this is zero additional work - or one extra bolt for the cam sprocket.

if the sprockets are the same - then they don't need changed and it's plug and play.  but it's so easy that shouldn't be a game changer.

 

they both need to be EGR as well.

  • Author

What would the cam and crank sprocket have to do with it? The engine in the 2000 is documented 35000 mile factory replacement Subaru engine.

  • Author

The 2000 was hit in the back and totaled less than 30 days ago, so not sitting more than 30 days.

  • Author

This is the subie short block used.post-59327-0-92654700-1447123148_thumb.jpg

Subaru used a couple different sensor wheel variations. Those sensor wheels need to match car or it wont run right.

What would the cam and crank sprocket have to do with it?

 

Drivers side cam sprocket has triggers for the cam sensor, crank sprocket has triggers for the crank sensor. 

Subaru used two different style trigger marks for those engines (this isn't always the case - but for those it is). 

The vehicle (namely the ECU) needs the correct trigger marks. so your options are:

 

1. verify the trigger marks are the same - count the teeth on the crank sprocket - only requires removing the timing belt cover, not a big deal.

2.  guess and hope it's correct and swap later if the car doesn't run.

3.  verify when/where those different triggers are used - since you presumably have both vehicles to work with you could check the cam/crank sprocket part numbers ***with Subaru*** ***using the VIN*** of each vehicle to see if they're the same.

 

i think it's a manual and automatic difference - but i could be wrong.  at this point I find it best to physically check myself.

 

4.  just swap them - that's the 100% repeatable/easy method.

 

That list shows new timing belt, tensioner, and pulleys, so there's no need for the belt to come off on that one.   check the part numbers i mentioned with Subaru/VIN.

  • Author

Ok Gary,

Next is what clutch, the motor I'm putting in comes out of an automatic, the car it's going into is a manual. What is the deal with the oversize bearing kit? Is this something I should be concerned with?

 

Drivers side cam sprocket has triggers for the cam sensor, crank sprocket has triggers for the crank sensor. 

Subaru used two different style trigger marks for those engines (this isn't always the case - but for those it is). 

The vehicle (namely the ECU) needs the correct trigger marks. so your options are:

 

1. verify the trigger marks are the same - count the teeth on the crank sprocket - only requires removing the timing belt cover, not a big deal.

2.  guess and hope it's correct and swap later if the car doesn't run.

3.  verify when/where those different triggers are used - since you presumably have both vehicles to work with you could check the cam/crank sprocket part numbers ***with Subaru*** ***using the VIN*** of each vehicle to see if they're the same.

 

i think it's a manual and automatic difference - but i could be wrong.  at this point I find it best to physically check myself.

 

4.  just swap them - that's the 100% repeatable/easy method.

 

That list shows new timing belt, tensioner, and pulleys, so there's no need for the belt to come off on that one.   check the part numbers i mentioned with Subaru/VIN.

Just take the flex plate off the motor and install the flywheel from your car and you're good to go. It all swaps over.

 

Exedy brand clutches are reccomended.

  • Author

Gary,

Both motors have 48 teeth on the cam sprocket, does this mean I'm good to go? Didn't pull the cover to count the crank, should I?

Gary,

Both motors have 48 teeth on the cam sprocket, does this mean I'm good to go? Didn't pull the cover to count the crank, should I?

That is on the front... The trigger everyone is referring to is on the back, ie. You would have to have it off to compare.

timing belt teeth are the same, i mean the trigger points on the back of the sprocket.  i'm not sure you can see those by just looking at the front. 

 

the crank sprocket is easier to look at - just pull the cover and look.  the trigger points stick up and can easily be seen on the back of the sprocket.

 

***you are not counting the teeth the timing belt rides on*** - the trigger points in the back.  look where the cam and crank sensors are - it's sensing the triggers.

  • Author

Thanks, I was trying to be lazy and not pull all the accessories of the front!

i hear you on that - I suppose you might be able to google pictures of the cam sprockets and maybe the differences are obvious enough to tell by feel?

 

or pull the crank or cam sensor and try to peak down the holes and see them that way?   or can you get your fingers behind the cam sprocket and feel for the marks?

  • Author

I have time to pull them, my clutch won't be in till Wednesday. Was hoping there was an easy was to tell, but I should do it now while I have them both side by side on the floor.

  • 2 weeks later...
  • Author

The Impreza outback lives again! Had to swap ps pump, ac compressor but the cam position sensor and crank position sensor worked! Thanks for all tha advice! Got the exedy clutch and it runs and drives and shifts great!

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