On Mon, 03 Jul 2006 10:54:58 -0400, Harry Krause
wrote:

Jim wrote:
"Harry Krause" wrote in message
. ..
JimH wrote:
1997 43.L Chevy 350 6 cylinder. Freshwater. Manifolds and risers are
original.

Tuned up just weeks ago with only 4.2 hours on the engine following the
tune-up.

Thermostat was replaced in spring.


I wonder if your tune-up guys pooched something and didn't tell you.
Not likely. More likely a scenario like this: Plastic bag gets sucked up
against water intake. Water is restricted or cut off completely. Engine
overheats and water pump fries. Engine shuts down or is shut down and
plastic bag slips away. After inspecting the water pump, mechanic suggests
that the owner ran the engine without water. Owner suggests to mechanic that
he should have seen that the water pump was on it's last legs when he
inspected it. (Write your own ending to this story)
Jim




Well, I keep reading about "impeller failure," but I dunno about that.
Jim boats on a freshwater lake. Bags, yes, but sand, sandbars, and the
usual crud one finds in coastal waters? Probably not.

This sounds very much like the symptoms I had with a plugged
manifold/riser. The smoke I got came from a rubber coated cable which was
resting on an exhaust elbow that overheated. I didn't have to use the fire
extinguisher though.

New manifolds and risers and exhaust parts made it run like new. Luckily, I
had no water get into the exhaust, but if a manifold gasket went bad, that
could also be a problem. When the engine is running, normally, I can place
my hand on a riser for a few seconds. When it was plugged, a slight touch
burned like hell!

--
John H

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