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Head gasket failure struck some early Red Labels.
Best guess based on your explanation: First the water pump quit / died, then engine overheated as a result and it remained running overly - hot for sometime thereafter, which (likely) led to
head gasket failure, which resulted with coolant in the oil and the performance symptoms.
Anyway, to sum up,
head gasket failure is more common but intake gasket failure is the only other way exhaust could smell like coolant, especially if oil and coolant aren't mixing.
On its last major service - which was early this year - the oil was a suspicious colour which the guy said can warn of
head gasket failure, but given the treatment it's had, he figured it was more likely to just be residual moisture that hadn't been given a chance to cook off.
If the head was torqued unevenly or was overheated prior to your ownership it could be slightly warped and creating recurring
head gasket failure.
Usually an overheated engine can cause the head to warp, which can cause
a head gasket failure.
She's very upset, though I don't know why since
a head gasket failure is a lot cheaper than an actual ruptured cylinder.
You can do a compression test to check for
head gasket failure, which involves removing each spark plug in turn and replacing it with a gauge that reads the amount of compression in the cylinder - if the head gasket is blown, one or two will be well below the others.
The purpose of the test was to see if I could prove
a head gasket failure.
Cause of
head gasket failure, responsibility of the shop or what to do next.
If you don't service the car, the major problem will occur much sooner, and it might be catastrophic (engine seizes) rather than major (e.g.
head gasket failure).
I think they should accept some responsibility for the second instance of overheating and
head gasket failure since the electrical thermostat was probably defective when they changed the two fans.
One way that
a head gasket failure could cause overheating would be if the gasket failed between a combustion chamber and the cooling system.
It still overheated when run on the freeway and slowed down - = back it went to the shop and they told her the # 4 cylinder was taking on antifreeze due to
a head gasket failure - not a big surprise.
Much has been written about K - series
head gasket failures, but thanks to the Elise's light weight they're less likely to be an issue here.
Slower leaks - hoses, radiator end tank separation,
head gasket failures...
Head gasket failures used to be a Scooby scourge, but by 2004 the automaker had devised a more durable gasket.
Not exact matches
The
head gasket between the crankcase and the cylinder
head could show weakness as the differing expansion expands one component a bit more than the other and over time weaken adhesion between the two surfaces resulting in a
failure.
What you say about the
failure mode is plausible, but I've had a coolant reservoir crack without any issues with the
head gasket or cooling system.
First, understand that not all
head gasket leaks (
failures) are the same.
On this episode of «How VW Parts Fail» we are looking at the
failure of the 2.5 L cylinder
head gasket.
I have had a few
failures, though, such as the
head gasket — it is a K - series, after all.
When an overheating issue is caused by a blown
head gasket, the primary
failure which occurred causing this is when combustion gasses leak into the coolant passages (usually coolant is leaking into the cylinder at the same time).
Sometimes catastrophic
head failures don't contaminate the oil (which does indeed produce a frothy substance as you describe); the
head could be cracked from the outside into a coolant passage, or, rarely and usually only in poorly manufactured or improperly installed
gaskets, the
head gasket can blow outward from a coolant passage.
If there was ever that much water in the muffler such that it was sloshing around, it would be a sign of catastrophic
failure in the engine, such as a blown
head gasket and the «water» would actually be antifreeze / water mix from the engine.
And eventually on higher mileage Subaru engines the
head gaskets form an external leak, Not to mention constant
failure of the spark plug tube seals.
The worst case would be a deep
gasket failure (i.e.
head) where coolant is mixing with oil, but you're not seeing any leaks..