impreza headgaskets

J

jmailhot

New member
My 2000 RS has 140K on it and has developed a headgasket leak. not a serious problem, oil is leaking out of the block. no oil/coolant mixing, or coolant into cylinders. Anyways... I think I'll get around to replacing the HGs this fall.

Is the OEM STi headgasket thinner than an OEM RS HG? if so I might like the slight increase in compression, unless it is so different that it would effect timing. Anyone know the diffrence in thickness between RS and STi gaskets?

Thanks

 
It is thinner indeed, and it does increase compression, but not by a ton. According to what I've read on RS25, it's a welcomed increase.

Also, "schedule" it soon. Speaking from experience, this isn't something you want to fail when you least want it to.

 
great, thanks for the reply jeremy. I will be sure to grab the STi gasket when I swing by evergreen to do thi project.

On a related note, what do people prefer, do headgaskets with engine in the car, or take engine out?

 
plus the sti gasket is all metal. its probably like a half CR point bump or so....

i'll post pics later about all the swapping stuff....

 
just be double triple quattro sure when you put the new hg's in, that ALL the oil galleries line up. if not, when you start up your freshly rebuilt motor, there will be massive oil leaks.

don't ax how I learnt this. :angry4:

basically, the passenger side hg's are very directional...there's a right way and a WRONG way for em to go on.

 
just be double triple quattro sure when you put the new hg's in, that ALL the oil galleries line up. if not, when you start up your freshly rebuilt motor, there will be massive oil leaks.

don't ax how I learnt this. :angry4:

basically, the passenger side hg's are very directional...there's a right way and a WRONG way for em to go on.

[/quote

ha ha yeah. both sides are directional actually. right and left gaskets are the same too, and theres the high pressure oil galley at the top front corner of the motor, near the headstud. the gaskets' hole is oval but the actual port is a round hole, about 1/4" wide. that's the only thing you need to make sure lines up.

its in this picture:

buildy26.jpg


see the top left head bolt hole? its the port just to the right of it. put the gasket on the wrong way and it'll be covered, then your oil pump will do its best to fire oil out the front of your motor. you can hang the headgasket on those little tube deals that sticks out where the bolts go in.

theres something similar near the intake manifold gasket as well. the intake manifold gasket can be placed on two 1/8" studs that are pressed into the heads so that the gasket is easy to line up, but the studs usually make it hard to get the heads back on. might be just as easy to take the little studs out and use the intake manifold bolts to align it before you tighten it down.
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