"mickey" wrote in
oups.com:

part of my problem is that the wtaer heater hoses are smaller than the
engine hoses, so obviously I need something to give there, thus the
bypass. Here's a diagram: (best viewed with a fixed-width font)

WATER HEATER
: :
: :
engine......____L___/___L____......heat exchanger (to engine)

Of course, the heat exchanger is mounted on the engine, but it's hard
to loop with these text diagrams Here ... and : are hoses, _L_ is
a T and _/_ is a valve. I have no valves between the _L_ and the heat
exchanger.


Are you sure about that? Water hoses and passages are BIG, not the tiny
hoses to the water heater. The heat exchanger is directly on the engine on
the Perkins looks hooked directly to the block passages. I don't think you
have to put a loop hose on it if you don't have a water heater....

That would seem stupid, to me. Water heater hoses should be like car
heater hoses. The engine outlet to the water heater comes from the high-
side of the thermostat, which pressurizes the water to the water heater.
The low side of the water heater return should go into the suction side of
the heat exchanger back into the engine, giving you hot water BEFORE the
thermostat opens.

I don't really remember. I'll look next time I'm in the bilge. I now have
quite a list to look at...(c;

--
Larry

Larry wrote:
"mickey" wrote in
oups.com:

part of my problem is that the wtaer heater hoses are smaller than the
engine hoses, so obviously I need something to give there, thus the
bypass. Here's a diagram: (best viewed with a fixed-width font)

WATER HEATER
: :
: :
engine......____L___/___L____......heat exchanger (to engine)

Of course, the heat exchanger is mounted on the engine, but it's hard
to loop with these text diagrams Here ... and : are hoses, _L_ is
a T and _/_ is a valve. I have no valves between the _L_ and the heat
exchanger.


Are you sure about that? Water hoses and passages are BIG, not the tiny
hoses to the water heater. The heat exchanger is directly on the engine on
the Perkins looks hooked directly to the block passages. I don't think you
have to put a loop hose on it if you don't have a water heater....


Granted it's late, but I don't really get what you're saying so I must
not have made myself clear. The Heat exchanger is on the engine, and
the only reason the loop is there is because of the water heater.

That would seem stupid, to me. Water heater hoses should be like car
heater hoses. The engine outlet to the water heater comes from the high-
side of the thermostat, which pressurizes the water to the water heater.
The low side of the water heater return should go into the suction side of
the heat exchanger back into the engine, giving you hot water BEFORE the
thermostat opens.

Hrm. I'll have to check on how mine is set up. I'll guess your setup
is right. I think mine goes into the suction side of the heat
exchanger, so I probably have the same setup.

mickey

"mickey" wrote in
oups.com:

Granted it's late, but I don't really get what you're saying so I must
not have made myself clear. The Heat exchanger is on the engine, and
the only reason the loop is there is because of the water heater.


Oh, I thought you were saying all the cooling water went through the water
heater and it wouldn't have cooling if you closed off that line entirely.
I was saying those hoses were simply extra and not part of the cooling
plumbing other than to be teed into them, like a car heater.

I'm sure they're both plumbed the same. The old engine and this
replacement that came out of someone's sloop were plumbed the same.
Lionheart has a shaft alternator so we leave the shaft turning under sail
all the time to charge the beasts (four L-16s). So, we kept the larger
hydraulic transmission from the old engine in the boat, thinking the
smaller transmission wasn't meant to be free wheeled all the time. The
hoses connected on the engine to the same spigots.

--
Larry

Now I have this terrible hankering to go to the marina and play around in
her bilge this weekend....(c;