These are all good points. In addition, if a blown head gasket becomes a likely
culprit, it is also possible that an overheating problem could be diagnosed at
the same time. Although it has not happened to me, I understand that a blown
head gasket could (although not always) lead to overheating by forcing hot
exhaust gases into the cooling system.
I believe another symptom of this would be excessive foaming in the radiator
tank.
Paul
In a message dated 5/7/2004 8:50:19 AM Eastern Daylight Time,
jbachan@xxxxxxxxxxxxxxxxxx writes:
>
>
> I'm sorry but I have to disagree with the quoted
> statment below. A compression test can tell a great
> deal more that just the condition of the top
> compression ring of a weak cylinder. For example first
> if you have two weak cylinder side by side this is a
> good indicator of a blown head gasked 'tween the
> cylinders, 2. if a weak cylinder compresion has the
> same low dry compression as wet (a few squits of oil
> down the spark plug hole to seal any weak rings)
> you're probally looking at burnt valves. and third if
> the compression increased after putting the oil down
> the spark plug hole (wet compression reading) your
> probally looking at rings. Further more rings tend to
> wear evenly unless on breaks if the oil ring failed
> the second compression ring would remove the oil. Yes
> in time it would build up carbon and break but this
> two would cause weak compression and you would see
> signs as oil consumpsion or fowled plugs. I'm soory I
> have to disaggree with the old service guy on this
> one.
> Joe
> 76NYB
> ...
> > Compression test? As the old line Chrysler service
> > mangager pointed out to me years ago, all the
> > compression test will check is the top (compression)
> > ring. It can still hold good compression and the
> > oil rings can still have enough wear and age
> > (including loss of tension) to not effectively
> > scrape the oil from the cylinder wall. The other
> > thing on a compression test is to use it as a point
> > of reference, one cylinder to another cylinder, not
> > looking for hard and fast numbers per se, but how
> > they all relate to each other.
> >
> >
>
>
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