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Old 03-23-2021, 02:16 PM   #26
joea99
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Originally Posted by Vancouver98STi View Post
That cylinder wouldn't have been firing then.

Do you recall which cylinder that spark plug was from? Just wondering if there's a correlation between that particular plug and either one of the two low compression cylinders.
#4 was the closed gap plug. As far as the low compression and my earlier post, I can say the results are in: Bad head gasket (at least).

I put the compression tester into #2 that had air escaping from it while testing #4. That effectively sealed it and forced the air elsewhere. I could hear it hissing, but was puzzled until I thought I should see something, somewhere and noticed the radiator hoses had gotten hard. I shut the air off and watched as coolant dripped out of the radiator overflow tube telling me the cap was lifting.

Well, I guess the next step is to decide if a simple head gasket'valve job (conditions willing) and timing belt kit are sufficient, or if a short bock or self rebuild in worth doing. 178,000 miles and had be using some oil.

I've seen some short and long blocks offered by "specialists" that "improved" things, but, kinda pricey.

I may be pulling the engine as replacing the clutch seems like a good idea at this point. I'd have to do that anyway if doing a swap or rebuild.
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Old 03-23-2021, 02:40 PM   #27
Vancouver98STi
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2006 Forester 5 speed non turbo...
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Originally Posted by joea99 View Post

I could hear it hissing, but was puzzled until I thought I should see something, somewhere and noticed the radiator hoses had gotten hard. I shut the air off and watched as coolant dripped out of the radiator overflow tube telling me the cap was lifting.
Good detective work.

I'm just curious... Is the Forester not equipped with a coolant overflow reservoir?
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Old 03-23-2021, 02:45 PM   #28
joea99
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Good detective work.

I'm just curious... Is the Forester not equipped with a coolant overflow reservoir?
Yes, but I pulled that with the fan assembly to ease access to the timing belt area. So I left the overflow attached to the radiator neck and hung it out of the way.
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Old 03-23-2021, 02:48 PM   #29
Vancouver98STi
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Ah... thanks.
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Old 03-23-2021, 07:46 PM   #30
Elbert Bass
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Glad you finally got it diagnosed, sorry it is the head gasket. I have performed head gaskets on engines at that mileage without needing valve work - modern engines are more robust than they were in the seventies when I started out.
When the heads are off set the cam to close the valves on a selected cylinder. Be sure no grit or gasket material is on valve face/seat. Put the head on stands or support it so the combustion chamber is facing up. Pour brake clean/carb clean/any solvent but water in the combustion chamber then see if the intake and exhaust ports are getting wet. That will show if your valves are sealing.
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Old 03-23-2021, 09:18 PM   #31
joea99
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Glad you finally got it diagnosed, sorry it is the head gasket. I have performed head gaskets on engines at that mileage without needing valve work - modern engines are more robust than they were in the seventies when I started out.
When the heads are off set the cam to close the valves on a selected cylinder. Be sure no grit or gasket material is on valve face/seat. Put the head on stands or support it so the combustion chamber is facing up. Pour brake clean/carb clean/any solvent but water in the combustion chamber then see if the intake and exhaust ports are getting wet. That will show if your valves are sealing.
Interesting way to check valves. I am a bit bummed that it's head gasket. Just hope I don't find more. I don't really want to sink much more into this one. It is in pretty fair shape, new muffler, front and rear brakes and drive shaft, but needs struts, and a clutch soon. Probably at CAT as and front sensor as well.

Would new rings and cylinder hone do anything to reduce oil consumption or is that just the nature of these beasts?
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Old 03-26-2021, 11:02 PM   #32
serrilion
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Interesting way to check valves. I am a bit bummed that it's head gasket. Just hope I don't find more. I don't really want to sink much more into this one. It is in pretty fair shape, new muffler, front and rear brakes and drive shaft, but needs struts, and a clutch soon. Probably at CAT as and front sensor as well.

Would new rings and cylinder hone do anything to reduce oil consumption or is that just the nature of these beasts?

I haven't found a good subaru yet that doesn't burn some oil between changes.


Sorry about the head gasket, they are fairly simple to do, tho the torque sequence can be a bit fun.


The Coolant over flow should be washed out as it might have black particles of old head gasket martial in it.



I say as long as your rear strut towers dont have rot threw them up near the top, do the head gaskets and run her till she blows.


Rockauto sells timingbelt and engine kits fairly cheap. Just did on in my 02 for under $500


cheers!
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