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From: Barbara Ungersma (no email)
Date: Sat Aug 02 2003 - 14:17:29 EDT
Hi all,
My new-to-me trawler came with a pyrometer that measures exhaust stack
temperature. My question concerns how to interpret the readings. Here
is what I have learned from reading/listening to others so far:
The professional skipper who took the boat for the pre-purchase survey
said just ignore it.
U. S. Coast Guard search and rescue literature I have seen indicates a
pyrometer is the best method of determining if you are overloading the
engine while towing, and observing the correct temperature avoids
burning valves under heavy loads. It implies that Coast Guard motor
life boats all have pyrometers, but give no specifics as to allowable
temperatures.
Another Coast Guard source told me that a pyrometer is the best
surrogate for a tachometer.
Finally, the previous owner of my boat had used a black pen to mark the
gauge at 460 degrees F. and 320 degrees F., presumable the max/min she
or he preferred. I exceed the 460 degree limit at 1600 rpm, and the
boat seems comfortable at 1800 rpm. The engine seems to be governed at
2200 rpm, though the manual claims 2600 is the specified max.
The engine is a Sable Lehman Super 135, late model of the ubiquitous
Lehman Ford 120. The pyrometer sensor is located on the pipe that goes
from the engine to the aqualift, about two inches above the flange on
the exhaust manifold.
Can you offer advice on what a safe operating temperature should be?
Thanks in advance for your help.
Mike and Barbara Ungersma
Osprey (Transpac Eagle 32)
San Leandro, CA
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