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Head gasket replacement on 90 legacy
Posted 06 May 2004 - 12:41 PM
I am reaching the conclusion that there is something off on one side of the engine in my 90 Legacy. The car has slightly lower compression on the passenger pair of cylinders (125-130 psi vs 155-160 psi for the drivers side - all with throttle closed), it idles poorly, pulling plug wires has a greater effect on the drivers side. The car has also overheated before, as both the radiator and the thermostat are bad.
So my questions are -
1. If there is a weak head gasket, is there any predictable way to guess how long it will last? Other than the rough idling, the car runs OK.
2. Should there be any other symptoms with an impending failure? At the moment, both water and oil are clean.
3. Does the engine need to be pulled to pull the head? It looks pretty straightforward, but I have not disassembled a Subaru engine in over 10 years.
Posted 06 May 2004 - 01:44 PM
It was actually easier to put them back in.
I also did it without removing the intake manifold. You just have to be careful to slide the manifold gasket in as you are putting the heads back on and get the manifold bolts started before you touque down the heads.
Posted 06 May 2004 - 01:47 PM
Posted 06 May 2004 - 02:00 PM
If you go through with it, you ought to at least test the flow thru the radiator and get it fixed if its not up to par. Also, water pumps seem to go at around 100,000 miles and would be easy to change at this time.
Hopefully you can get some good info. on your Questions # 1 & 2 before you proceed. I don't think a small head gasket leak would show up in a compression test. You may have something more serious going on with your valves or the lower half of your engine. Good luck.
Posted 06 May 2004 - 07:25 PM
Posted 07 May 2004 - 09:51 AM
Posted 07 May 2004 - 10:50 AM
It sounds like the heads can come off in place if you just leave the bolts in the head instead of trying to remove them completely from the head.
Posted 07 May 2004 - 12:36 PM
Posted 07 May 2004 - 03:19 PM
From my past experience with Corvairs, I concur with your assessment on low compression. I have not seem significant issues until the compression dips at least below 100 PSI.
I also tried adjusting the large needle screw on the air intake after i removed and cleaned the air intake. This adjustement seemed to smooth out the idle a little, but it may have been mu imagination - Im not sure how to properly adjust it. I can see that it regulates the amount of air that bypasses the throttle plate, so its impact is primarily on idle.
Posted 07 May 2004 - 05:19 PM
close, it was a sedan. I dunno what other stuff you had to remove from the head, do you mean the valve covers and stuff, or are you talking cam sprockets and manifold and stuff?
If you did it on a '90 wagon 2.2 without raising the engine or taking anything off the head assembly, I am triuely amazed.
Also brute I dont think it's possible to remove all the bolts or any for that matter without removing the head. As for that screw, it's not supposed to be adjusted. You should try and put it back to where it was set from the factory, should have some paint on it to line it back up.
Posted 07 May 2004 - 07:52 PM
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