I like my subaru but head gasket have used the sealant no problem yet

[sheps58]

Has Subaru corrected the head gasket problem and how did they correct the
problem on the new subarus. How many miles do people have on the 2.5
engine. Any one with more than 150000 miles?

 

[George Adams]

187,000 when the gasket let go. Repaired by independent local shop, now
have 212,000 with no further problems.

 

[MN]

Has Subaru corrected the head gasket problem and how did they correct the
problem on the new subarus. How many miles do people have on the 2.5
engine. Any one with more than 150000 miles?

Here is some very interesting info on how to fix the problem yourself:

http://www.talkaboutautos.com/group/alt.autos.subaru/messages/146731.html

 

[CompUser]

@newssvr21.news.prodigy.com>, (e-mail address removed)
says...

Here is some very interesting info on how to fix the problem yourself:

http://www.talkaboutautos.com/group/alt.autos.subaru/messages/146731.html

Yah....did anyone ever figure out wtf a
"swirlpot" is?

 

[John O]

Yah....did anyone ever figure out wtf a
"swirlpot" is?

Not being a mechanic...does anyone have a photo of this?

-John O

 

[Florian Feuser /FFF/]

Here is some very interesting info on how to fix the problem yourself:

http://www.talkaboutautos.com/group/alt.autos.subaru/messages/146731.html

The theory behind that is that air gets trapped at the highest point of the
cooling system inside the engine and that getting rid of that air will eliminate
a possible local coolant boil that - through its expanding gas bubble - blocks
the heat transfer. This in turn accelerates the phenomenon and the engine
overheats, may even warp and blow its gaskets.

In this theory, blown gaskets are the consequence not the cause of the issue.
This may be possible, since many many 2.5 engines of identical design do NOT
blow their gaskets - they may just have been properly bled of air inside the
cooling system.

My concern with the solution posted is, that by connecting a pipe into the
coolant flow inside the engine, you disturb the flow surface and create a
potential nucleus for cavitation. This may cause the exact problem the device is
supposed to eliminate. IMO, It would be a good idea to first examine the rate at
which the coolant flows in that area.

florian /FFF/

 

[Carl 1 Lucky Texan]

This is an odd question, and is prompted by one reference I read on the
'net - I know dangerous - but that is why I'm asking. Is it true that
Subaru at one time or at present routes coolant INTO the radiator at the
bottom and OUT to the engine from the top? If this were true it seems it
would be a source for air getting 'gulped' into the coolant system.

Carl
1 Lucky Texan

 

[T]

Not being a mechanic...does anyone have a photo of this?

-John O

If this is what I think it is it's the coolant expansion tank in modern
coolant systems.

Old sealed systems had an expansion tank built into the end caps, and
you filled directly through a cap in the radiator.

Later systems have a few hoses and a bottle with a cap, this is the high
point of the coolant system and is likely what the guy is calling a
'swirlpot'.

Since all the coolant passes though the expansion tank it is likely the
bubbles will eventually get passed out and remove themselves from the block.

From my experiences with VW inline motors there is a real concern when
refilling the motor to avoid bubbles in the block and refilling via the
'top' coolant hose is key. It's also called backfilling.

If what the link mentions is true then getting all the trapped air out
is key, and keeping any that gets in from remaining is beneficial.


TBerk

 

[T]

I found out a 'swirl tank' is not exactly the same as an expansion tank.

It has an intake and an outlet where the coolant flows into a
(cylindrical?) tank before going on to other, more common parts of the
system like expansion tank, radiator, and/or overflow catch bottle.

It enters at an angle, causing the 'swirl'.

Now, what possible reason you would want one still remains a mystery to
me, but Google will find a few links if it's really interesting to
explore further.


TBerk