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Old 10-10-2016, 02:49 AM   #1
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Hi All!
I have a 95 Maxum 2400 scr with a 5.7l Alpha 1 Gen 2 that has a engine only closed cooling system. The temp is between 160 to 170 at the tstat and 170 to 180 at the elbows using I R gun.
Both of the cooling line to the elbows are routed from the HE after the raw water has cooled the engine!
My question is does this sound correct?
That is the way the instructions say to plumb it!
It was installed on the boat when I bought it!
First time owning a fresh water cooled engine!
Thanks to all!
Don
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Old 10-10-2016, 11:17 AM   #2
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Don is the closed cooling system a full (engine and exhaust manifolds) or partial (engine only)?

In a full system the closed system will have a supply and return hose to each exhaust manifold and a raw water hoses to the elbows. Block off gaskets are used between the manifold and elbow.

In a partial system the raw water hoses should go to the bottom of the exhaust manifolds. Standard open gaskets are used between the manifold and elbow.
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Old 10-10-2016, 02:49 PM   #3
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Hi Mike!
Thanks for the reply!
It's a partial system! It does not have a raw water pump at the engine!
This is all new to me, so I am just trying to find out if this thing is functioning properly!
Or if I should just remove it and go back to a sea water system!
I do like the idea that I do not have to drain the whole system to winterize it, that and the fact that the boat has a cabin heater in it as we do a lot of boating in the late Fall and early Spring!
Thank Again!
Don
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Old 10-10-2016, 02:55 PM   #4
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The sea water pump is in your Alpha drive. Fresh water cooled is the way to go. Engine will last longer with less cooling system related troubles.


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Old 10-10-2016, 03:26 PM   #5
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Hi Speedy!
That is what I was thinking, but like I said this is new to me!
Just trying to see if the temps are close to what they should be or if something is wrong!
I am familiar with open systems, just not a closed system!
Thanks Again!
Don
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Old 10-10-2016, 04:13 PM   #6
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Don as stated the raw water pump is in the drive and provides sea water to the heat exchanger to remove engine heat just like air does when passing through a car radiator.

It sounds like the exhaust is not set up correctly for a partial system should have the raw water going to the manifolds and not the elbows which is why the temps are too high. Can you post some pictures? Also do you have a brand and model number of the closed cooling system?

I would keep the system but get it set up correctly which should not take much.
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Old 10-11-2016, 06:42 PM   #7
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Hi mmwjr
I have the installation instructions and the diagram for the system and it shows the cooling lines going to the bottom of the manifolds and the elbows pluged! That is the way it is plumbed!
I do not think that the system is factory as the Merc. manual shows a raw water pump on the engine!
Just seems strange that the manifolds get water that is already hot from the HE!
Thanks for the reply!
Don
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Old 10-11-2016, 07:32 PM   #8
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That's how is works. The water coming out of the heat exchanger isn't as hot as you might think. In a raw water cooled engine, that used water goes into the manifolds and elbows, too.
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Old 10-11-2016, 10:07 PM   #9
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Quote:
Originally Posted by donald View Post
Hi mmwjr
I have the installation instructions and the diagram for the system and it shows the cooling lines going to the bottom of the manifolds and the elbows pluged! That is the way it is plumbed!
I do not think that the system is factory as the Merc. manual shows a raw water pump on the engine!
Just seems strange that the manifolds get water that is already hot from the HE!
Thanks for the reply!
Don

Hey Don call me Mike

In post one you said the hoses went to the elbows not the manifolds. The Merc manual is for a Bravo drive as that do not offer a HE for the Alpha yet it's availble in aftermarket. What brand is the system?

From the last post it sounds right but the exhaust temps are high IMO.

Can you post some pictures of the set up?
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Old 10-12-2016, 12:04 AM   #10
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Sorry Mike!
I guess my fingers and my brain are not fully connected also!
Should have said to the manifolds!
I don't know the brand as the paperwork I have does not have a name or logo on it!
Nothing on the HE either!
Thanks
Just call me mr. Dumb Fingers!
Don
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