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Old 06-03-2007, 12:29 PM   #1
macantley
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Default how hard to swap in a 99+ sohc motor into a 98 forester?

a friend of mine has a 2001 2.5L motor thats complete and in good shape, im wondering how hard it would be to swap it into my 1998 forester?

is it basically plug and play? any and all help would be appreciated.

BTW mines a 98 forester 5 speed, the other forester is a 2001 auto.

matthew
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Old 06-05-2007, 09:03 PM   #2
Charlie-III
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Chapter/Region: Tri-State
Location: 07456, North NJ
Vehicle:
1998 Legacy 2.5GT
Silver Sleeper Wagon

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The AT to MT swap is easy, unbolt the flex plate from the AT and bolt on the flywheel from the MT.

Most other bits are a simple swap, the sensors and engine harness may be a bit different.

It "may" help to swap your intake manifold onto his engine.
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Old 06-05-2007, 09:32 PM   #3
Patrick Olsen
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Location: Where the Navy sends me...
Vehicle:
1997 Legacy 2.5GT
QuickSilver Metallic

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Quote:
Originally Posted by Charlie-III View Post
... the sensors and engine harness may be a bit different.
This is actually something I've been curious about for a while but have never really done the homework to figure out. I know the main harness plug at the ECU is different, but I don't know about at the engine. I also don't know how the sensors compare. Some differences that come immediately to mind are MAP vs. MAF and different throttle body/IAC setup (DOHC engines have a separate IAC, SOHC engines have it incorporated into the throttle body), so there would definitely be some harness differences there.

The engine wiring harness is all zip-tied to the bottom of the intake manifold. From going through a couple engines in the past few months I know that the '97-99 2.5GT/'97-99 Outback/'98 2.5RS/'98 Forester DOHC engines have 3 plugs at the back passenger side of the engine - a smallish white plug and 2 big grey plugs. The harness feeds the 4 injectors, TPS, IAC, crank position sensor, cam position sensor (reading the driver's side intake cam pulley), oil pressure sending unit, coolant temperature sending unit (for the ECU) and gauge sender (for the instrument cluster), two vacuum solenoid/sensor things (one is part of the EGR, the other one I can't remember right now), knock sensor, and the coil pack. I think that's it.

So if you put a SOHC engine in your originally DOHC vehicle there are going to be some issues. Some stuff may be the same (temp sending units, knock sensor), but some stuff is going to be different (MAF vs. MAP, TB and IAC, probably the cam position pulses).

Quote:
Originally Posted by Charlie-III View Post
It "may" help to swap your intake manifold onto his engine.
Won't work - the bolt pattern where the intake joins the heads is different since the '98 Forester is a DOHC engine.

Pat Olsen
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Old 06-05-2007, 11:15 PM   #4
macantley
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thanks guys, im just going to have the headgaskets replaced on the forester i guess.

i figure while im in there, im replaceing the cam seals, the oil seperator plate, possibly my clutch (but it still grabs good though) and im also going to replace my transmission, mine grinds in 2nd gear when shifting up or down, so im going to swap in a good tranny, then run a mix of sychromesh and a synthetic gear oil.

matthew
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