Rich,
You are completely correct, and that aside.

James,
As you are looking to get hot water heater of the engine jacket, do some
careful research. It is possible to do this by breaking into the
coolant cycle inside the thermostat on most engines. This may not
require the closed cooling conversion.

Matt Colie
Lifelong Waterman, Licensed Mariner and Pathological Sailor



Rich Hampel wrote:
With absolutely no flame intended ... a fresh water cooled engine will
last longer, can be run at higher operating temperatures thus better
combustion efficiency, etc. etc. There are many sources of 'add-on'
or conversions to make an old raw cooled into a freshwater cooled
engine. The Atomic-4 fans have been doing it for years and consider it
to be THE most efficient and least costly item to prolong an engine's
service life.

What usually 'kills' a marine diesel is internal corrosion of the
block, etc. NOT the engine 'wearing out'. Freshwater cooling nearly
eliminates that probability and no matter or whether the raw water side
is cooled with freshwater or sal****er.

:-)


In article . com, Bob
wrote:

On Apr 6, 9:17 am, "James" wrote:
I'm looking for a site that has information on these two engines. I'm
about to acquire one not sure if it's QM or GM. Is raw water cooled
would like to possibly convert it to fresh water cooling.

--
Hi:

As a 3QM30H owner built in 1978, why do you fell it is necessary to
convert to fresh water cool?

I am braced for all the flames..........................,
Keep It Simple Bob