Hey all-

I have a 3 cyl. Yanmar that has been modded with a Freshwater cooler.
How much water is tolerable coming out of the exhaust?

thanks
b

"Whistledown" wrote in
oups.com:

I have a 3 cyl. Yanmar that has been modded with a Freshwater cooler.
How much water is tolerable coming out of the exhaust?


Out the exhaust on the engine or where it comes out the side of the boat
with the cooling seawater??

Out the side of the boat, there's lots of water, which is what cools the
exhaust so the hoses don't melt.....or so we hope.

--
Larry

3QM or 3GM should be putting about 3.5 gallons per minute at 2500 rpm.
out the wet exhaust discharge - use a bucket and stopwatch.

If not, then fouled or 'salted' exhaust manifold jacket, slipping
impeller due to worn cam lobe in pump, broken pump impeller downstream
of pump and lodged in the circuit, fouled inlet strainer, huge slabs of
rust breaking off inside exhaust manifold, or fouled or 'salted' water
injection elbow. My bet money is on a lodged broken piece of impeller
vane or fouled/salted exhaust manifold.

In article .com,
Whistledown wrote:

Hey all-

I have a 3 cyl. Yanmar that has been modded with a Freshwater cooler.
How much water is tolerable coming out of the exhaust?

thanks
b

I had chronic overheating problems with a Yanmar 2GM20FC. Everyone I
talked to said it was the the exhaust elbows or the props or high
output alternator. Finally I stripped down the head exchanger and
found some eel grass had reduced flow 50%. Works great now.


Rich Hampel wrote:
3QM or 3GM should be putting about 3.5 gallons per minute at 2500 rpm.
out the wet exhaust discharge - use a bucket and stopwatch.

If not, then fouled or 'salted' exhaust manifold jacket, slipping
impeller due to worn cam lobe in pump, broken pump impeller downstream
of pump and lodged in the circuit, fouled inlet strainer, huge slabs of
rust breaking off inside exhaust manifold, or fouled or 'salted' water
injection elbow. My bet money is on a lodged broken piece of impeller
vane or fouled/salted exhaust manifold.

In article .com,
Whistledown wrote:


Hey all-

I have a 3 cyl. Yanmar that has been modded with a Freshwater cooler.
How much water is tolerable coming out of the exhaust?

thanks
b

Jeff wrote in :

I had chronic overheating problems with a Yanmar 2GM20FC. Everyone I
talked to said it was the the exhaust elbows or the props or high
output alternator. Finally I stripped down the head exchanger and
found some eel grass had reduced flow 50%. Works great now.



I don't understand them when they tell people this. An overloaded diesel
produces huge clouds of BLACK SMOKE, not overheating. As it bogs, it
creates overinjection in naturally aspirated diesels. Smoking like hell,
it doesn't overheat.

--
Larry

In article , Larry
wrote:

Jeff wrote in :

I had chronic overheating problems with a Yanmar 2GM20FC. Everyone
I talked to said it was the the exhaust elbows or the props or high
output alternator. Finally I stripped down the head exchanger and
found some eel grass had reduced flow 50%. Works great now.

I don't understand them when they tell people this. An overloaded
diesel produces huge clouds of BLACK SMOKE, not overheating. As it
bogs, it creates overinjection in naturally aspirated diesels.
Smoking like hell, it doesn't overheat.

Larry, yours was a non-sequitur and incorrect to boot. Yes, a 2GM will
smoke when overloaded, but if run at 3600 for an hour, it will overheat
as designed and advertised. You can run it at 3200 all day though.

Reduced cooling flow of course will overheat any engine. Got an acorn or
similar stuck in our intake once. Engine overheated 5 minutes away from
the dock.

--
Jere Lull
Xan-a-Deux ('73 Tanzer 28 #4 out of Tolchester, MD)
Xan's Pages: http://members.dca.net/jerelull/X-Main.html
Our BVI FAQs (290+ pics) http://homepage.mac.com/jerelull/BVI/

Jere Lull wrote in news:jerelull-
:

Larry, yours was a non-sequitur and incorrect to boot. Yes, a 2GM will
smoke when overloaded, but if run at 3600 for an hour, it will overheat
as designed and advertised. You can run it at 3200 all day though.



If your 2GM will turn that prop at 3600 RPM it's NOT overloaded, just
overrevved. Overloaded you'll never get to 3000 RPM with a too-big pitch.

--
Larry