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blown head gasket or cyl liner/engine block separation?
Posted 12 July 2003 - 08:23 AM
i went to the dealer the other day (in SE PA) and asked for a head gasket replacement estimate and he asked what symptoms i was having. i told him about the overheat & bubbles in the expansion tank. he said that it was probably not the head gasket, but more likely the "cylinder liner separating from the engine block." he said that they have not had any problems with the head gasket on this car (97 2.5l), but have had a lot of problems with the BLOCK?!? i asked if there was any way to check this, and he said that you have to remove the heads and check the block. i asked if he felt that this was a normal problem, for the block to go bad at 72k miles, and he just seemed to shrug it off. he gave me on of those "i've been working for subaru for 15 years..." blah blah blah. he said that that this particular engine (2.5l phase 1) doesn't have head gasket problems, rather this cylinder liner problem. i asked if he was sure, with everything about having bad head gaskets, not to mention the 6 revisions of the head gasket by subaru, and he stuck to his story...
feeling that he was full of @#$%, i walked out with the estimate... has anyone ever heard of this? i searched the web for this, and only found one person talking about it, www.imprezawrx.org/STi_Ml...est252.txt (link not currently working), but found a ton of articles about the head gasket problems. i figured he was just giving me crap after saying that there were no head gasket problems on this car, especially after reading everything on this board.
Posted 12 July 2003 - 09:09 AM
I've been on this board (and poke around some others) for 2.5 years now. In the latter part of 2001, a lot of head gasket posts started popping up. I asked my dealer about it around the end of the year. They said they'd only had a couple occurrances. March 2002, my head gasket goes. While I'm waiting in the service area, the service writer is talking to someone on the phone about persistent overheating problems etc... possible head gasket failure, and so on. I started to inquire. I was told that over the past several weeks, they were doing head gasket work at the rate of 2 per week. This continued on for a good part of 2002. I asked again earlier this year (2003) and I was told that the blown head gaskets had pretty much run their course. They weren't seeing too many anymore.
Cylinder liner loosening? It's possible. I can't say that I've stumbled upon that. Sometimes cracked blocks or heads are suspected. I don't think that is frequent either though. Head gasket failure. Yes... lots of evidence on that one.
The odds would point to the head gasket. You won't know though until you are in there. A commonly quoted figure for head gasket work including machining of the heads and a valve job is around $1000 US.
Posted 12 July 2003 - 09:14 AM
Colorado Component Rebuilders, Inc.
5861B Marion St., Denver, CO 80216
Phone: (303) 293-9230, Fax: (303) 293-9231
Posted 12 July 2003 - 08:03 PM
Posted 12 July 2003 - 08:27 PM
i did get a quote from ccr about replacing the engine. due to my current employment situation (or lack thereof), i am unable to replace it, and will most likely be doing the job myself. i have read all the great things about ccr, and they got back to me very quickly and i am definately impressed.
as for if this engine uses liners or not, i dunno. i just searched the web, and didn't find a definitive answer. i assumed it did... i always assumed that they pressed in a cast iron liner, but a web search reveled that there are currently some ceramic coatings that they can apply to a basic aluminum block without the need for a liner. i couldn't find what subaru uses (or doesn't).
Posted 12 July 2003 - 08:30 PM
I don't know if we're are referring to the same thing when we say "liners". Virtually all Aluminum engines employ a steel cylinder of some sort. Cast in place or pressed in place somewhere along the manufacturing process. This is what I understand to be a "liner". (And I know the terms is used since it comes up in specs in the industry I work in.) I believe that old cast iron blocks had a separate liner inside the cylinder bore and this is the origin of the term. Perhaps someone can comment.
I read an article in the past year where one manufacturer (Mercedes I think it was) has and engine that uses Aluminum liners. The alloy is a special mix with Silicon and other stuff to give it heat and wear resistance. Being of an alloy matrix through, it would actually "bond" to the block when it was cast, becoming an integral part of it. The molten Aluminum for the block would melt about 20% of the liner thickness where it contacted it and fuse right to it. No loose liner possible in this case (short of tearing the metal apart). I think this was a limited production engine. It might have been a prototype... I can't recall now. Still, probably a sign of the future.
Just saw the above post about ceramic coatings. Coatings of one sort or another are certainly possible. As with any of this stuff, it's all about economics. I don't know to what extent coatings are used. I saw the block of my engine when it was replaced. I'm 99% sure it was just a conventional (cast) steel liner. That's still the case with most engines I believe.
Posted 16 July 2005 - 09:22 AM
The liners are installed while both the block and liners are cold. I have never heard of a liner seperating (despite my poor spelling ive been doing this for over 20 years on the engineering end). If the liner did seperate, MAN the engine would blow itself apart, as the liner would turn into a hammer.
That said there are tow terms here, a liner and a sleeve. a liner is installed in the engine bore. a sleeve is installed usually due to over boaring a block, since what happens is that you breech the water jacket. Just an FYI.
Posted 16 July 2005 - 09:58 AM
When these shift, it is always been away from the head (lower into the block). And he says its not by much (.005 to .0010). But enought to see when you have the head off. Symptoms........You guessed it.....Same as the 2.5 DOHC head gasket.
So for a Service Mgr to make a blanket statement is ir-responsible. As with all mechanical things, you don't know until you take it apart. But the ODD's are in favor of a blown head gasket, and not the liner shifting.
P.S.....EndWrench has a good writeup this month on Subaru Cooling Systems...Confirming what I have done for the neighbors for over 20 yrs....Do NOT FLUSH COOLING SYSTEMS....and ALWAYS use De-ionized / De-minerialized water when refilling. Can get it in almost any supermarket.
Posted 20 July 2009 - 05:03 PM
Posted 21 July 2009 - 02:59 PM
Posted 21 July 2009 - 03:01 PM
its what i get for having too many screens open................. not posting on the correct link...
i've done that too
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