Loss of compression

hi all, anyone had problems with loss of compression on a 206cc? if so oculd
you let me know what the possible causes are and if this is a frequent
problem . thanks

 

Most likely is probably the cylinder head gasket but you need to investigate
further. Check inside oil and water filling points for a creamy substance
and check that the oil level isn't rising or the water disappearing.
Another possibility is broken or badly worn piston rings. Blue smoke from
the exhaust is a symptom of that. Post back with more information if you
can and the folks on here may be able to advise you further. A compression
test on each cylinder would tell you if the problem is one cylinder or more.

 

When you say loss of compression, have you tested it? And if so, have you
tested it both dry and wet? And is the compression loss one one or more or
all cylinders? And what are the results?

Or do you mean loss of power, and you're attributing this to compression
loss, which may or may not be the case?

Otherwise, what keith said.

Steve

 

Hi,

That might be interresting too...

The vicious case : worn cam/camshaft or burnt valve. Even if it usually
makes a certain kind of noise you can't miss (ie, lost cylinder for
example).

Regards,

 

Just as an aside, and to give some amusement. Back in the early 1960's, a
guy I worked with bought an MG Magnet saloon at auction. In those days you
couldn't start the engine when you inspected the car before bidding for it,
but you could turn the engine over with the starting handle (for younger
readers, this is the thing you really miss these days when your battery goes
flat). He turned it over and felt the good compression of each cylinder
and finished up buying the car.

It was delivered to his house on a low loader a few days later and that
evening he decided to go for a run. The engine wouldn't start. With
friends he spent two days trying to start it. Eventually, they decided to
remove the cylinder head. That was when they found that the good
compression was provided by a tennis ball in each cylinder.

 

I doubt you could start any diesel engine with a starting handle. They had
other uses though. More than once I have "wound" a car up onto ramps using
the handle and leaving the car in either first or reverse. They also
provided a good way to turn the engine for setting the timing. If you held
them wrongly when starting an engine it was a very simple way to get a
broken thumb.

 

Hi,

Err, I know that, a little. Mind you, when I was a very little boy, and up
to early 90's I'd say, my dad had an Ami8.
But I never attempted to start an engine with that... and anyway, modern
Diesel engines with electronics and compression ratios, may be difficult to
start with such a tool

And so he wrote a page of the legend. Here, it's known as being risky to buy
a car in an auction, because of the robberies possible, as it happened to
your friend.
OK, you can start the engine now, which reduces the risk.

Regards,

 

Not just at auction! I remember some 30 years ago when a mate bought a
three cylinder motorbike, a Kawasaki S1C 250 IIRC, if was a "bit flat".
Now they were prone to eating spark plugs and needing rings/breaking
rings so he didn't worry too much about it.
When he stripped it down a few days later he found that the center
piston was missing - as in no longer physically in place - and had been
replaced by a tennis ball neatly slipped onto the end of the con rod.
It ended up being broken for parts!

 

Hi,

had
True. Even starting "designed for" like oldest tractors (Lanz or Vierzon)
wasn't easy.

Eeeer my mum being a lock-keeper, and as I've been one in my early days, I
have to agree

Cheers,