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Sonny:
There are several uses for pyrometers on diesels. One use of the infrared
gun we have been discussing is to measure the temperature at each exhaust
port and compare the readings. You would measure the exhaust at the point
where the exhaust manifold joins the block and you can see the 6 individual
connections before they go into one big pipe. (I assume that your Lehmans
are like my Detroits). There should not be a difference. If there is a
difference, it indicates an injector or mechanical problem with
that cylinder. Other uses would be to measure the temperature at various
points in the cooling system to establish what is the normal temperature
and record it. Then if you have a overheating problem, remeasure the same
points and try and draw some conclusions from the data. They are also
useful in diagnosing a overheated connection or a circuit breaker that was
hotter than normal.
The other kind of pyrometer is installed permanently in the exhaust and
reads out like any other gauge on your panel. It gives an indication of how
hard the engine is working. It is especially useful on a twin engine setup
because you look for differences.
My background is as an automobile mechanic and I am still learning about
diesels and the differences. I think you can live a long healthy life and
enjoy boating to the fullest without either one of these things. The
infrared gun is new technology and is a neat tool that would be fun to have
and use.
You have to remember that I do almost all my own work on the boat and the
engines and I probably look at things differently when it comes to this
stuff. I am also a little weird and love gadgets. If you normally have a
mechanic come down and service the engine than you probably don't need one
of these things because your mechanic will have one.
I know it is over 20 words but I hope this helps.
Frank
At 09:14 AM 01/02/01 -0600, you wrote:
>
>I have been reading the threads about purchasing a pyrometer to check hot
>spots and due to my lack of experience with diesel engines I have become
>very suspicious. Can someone tell me in 20 words or less using the KISS
>principal Who? What? Were? How? Is having one of these units make me feel
>better. I have a pair of 225 Turbo/Inter Lehman
>
>Sonny Crisler
>M/V Ruby Sea
