Alpha One MCM 200 heat exchanger removal-gctid803182

[heedrix]

Hello

I have a mercruiser alpha one mcm200 with a cooling system that has a heat exchanger. the water is drawn up from the lake, through a hose by a pump driven by the engine. Is there a way to remove the exchanger, to have the water from the lake directly cool the engine? I think the heat exchanger is cracked and coolant from the engine is mixing with lake water, causing the engine to over heat.

Thoughts?

[2850Bounty]

Yes, you can eliminate the Closed Cooling system..... but I would ask why?

I would remove the H/E and have it repaired.

It doesn't get any better than having a Closed Cooling System to protect your engine.

Better for cabin heater and water heater use, no draining down of cylinder block during winterizing, no interior corrosion issues, etc.

.

.

[builderdude]

"heedrix" post=803182 wrote:
Hello

I have a mercruiser alpha one mcm200 with a cooling system that has a heat exchanger. the water is drawn up from the lake, through a hose by a pump driven by the engine. Is there a way to remove the exchanger, to have the water from the lake directly cool the engine? I think the heat exchanger is cracked and coolant from the engine is mixing with lake water, causing the engine to over heat.

Thoughts?

Belt driven engine mounted raw water pump on an Alpha?

[builderdude]

"heedrix" post=803182 wrote:
Hello

I have a mercruiser alpha one mcm200 with a cooling system that has a heat exchanger. the water is drawn up from the lake, through a hose by a pump driven by the engine. Is there a way to remove the exchanger, to have the water from the lake directly cool the engine? I think the heat exchanger is cracked and coolant from the engine is mixing with lake water, causing the engine to over heat.

Thoughts?

Belt driven engine mounted raw water pump on an Alpha?

Are you loosing coolant? Pressure test the cooling system and find out where your issue is.

PS- you'll likely loose some engine coolant (EG) during the overheating, you sure your impeller is pumping The proper volume?

[Pcpete]

My first reaction to the op's naraitive is belt driven pump on an alpha??? There have been conversations, but it's not very common. That makes me wonder if he is misunderstanding the raw water cooling side of his closed cooling. Pictures would certainly help if there has been a conversion. Otherwise, Hedrix, do you know that there is a raw water pump in the drive? What kind/type of boat is your engine in?

[Ruffryder]

Belt driven circulating water pump he meant to say most likely...

[builderdude]

It's certainly a bit of a mystery, the OP refers to his engine driven pump pulling in lake water on a system that apparently has a heat exchanger fitted :whistle:

[ken51k]

Post some pictures because what you are saying is not the common setup. You have us confused as to how your boat is setup.

[Alaskanmutt]

"Ruffryder" post=803229 wrote:
Belt driven circulating water pump he meant to say most likely...

Alphas feed water comes from a pump in the lower outdrive......

Only pump on the engine is the normal circ pump for engine cooling.

But you knew that.

[heedrix]

Hi Everyone

The engine is in a Cadorette Holiday 200. Here is a pic of the engine.




The bottom left pulley (which you can only see half of) is the circulating pump for the lake/raw water.

Heedrix

[2850Bounty]

"heedrix" post=803929 wrote:
Hi Everyone

The engine is in a Cadorette Holiday 200. Here is a pic of the engine.

[attachment]35317 wrote:
$_27(6).JPG[/attachment]

The bottom left pulley (which you can only see half of) is the circulating pump for the lake/raw water.

[color]#000088 wrote:
That is your belt driven Seawater Pump!

The Engine coolant circulating pump is above that. [/color]

Heedrix

[attachment]35321 wrote:
seawaterpumpforheedrix.jpg[/attachment]

[color]#000088 wrote:
Back to post #1 for a minute.[/color]

"heedrix" post=803182 wrote:
Hello

I have a mercruiser alpha one mcm200 with a cooling system that has a heat exchanger. the water is drawn up from the lake, through a hose by a pump driven by the engine.

[color]#000088 wrote:
OK.... as mentioned, the Alpha drive's seawater pump is in the lower gear unit.

The seawater path from this pump also aids in the upper gear unit cooling.

Your engine is fitted with a belt driven seawater pump that provides seawater to the Heat Exchanger (actual engine cooling is via E/G coolant and the H/E).

You must keep the A drive seawater pump active in order to provide the upper gear unit cooling..... or, install a drive shower.... of which I don't actually care for!

[/color]

.

[builderdude]

"heedrix" post=803182 wrote:
Hello

I have a mercruiser alpha one mcm200 with a cooling system that has a heat exchanger. the water is drawn up from the lake, through a hose by a pump driven by the engine. Is there a way to remove the exchanger, to have the water from the lake directly cool the engine? I think the heat exchanger is cracked and coolant from the engine is mixing with lake water, causing the engine to over heat.

Thoughts?

Engine overheating:

-Test the flow rate from the belt driven engine mounted raw water pump,Rick marked with B. See chart for proper volume.

- Youre sure it's an Alpha drive? If so has the lower units impeller been removed to allow the engine mounted raw water pump to pull water through the drive? Or is the drive still pumping via the drive impeller and spitting back into the lake or are the "working" together?

-if I suspected a leak within the heat exchanger I would pressure test the cooling system.

[builderdude]

Having freaking difficulties again tryin to attach an image :S

[heedrix]

Thanks everyone! There's actually a hose that goes from the engine driven pump ( B ) to an intake from the bottom of the boat (indicated by the arrow)

[2850Bounty]

"heedrix" post=804093 wrote:
Thanks everyone! There's actually a hose that goes from the engine driven pump ( B ) to an intake from the bottom of the boat (indicated by the arrow)

[attachment]35357 wrote:
engine.png[/attachment]

[color]#000088 wrote:
Yes.... that hose would be the lake/river/ocean water supply for the "seawater pump" ("B").

Where the red arrow points (and where this hose connects), you should have a "seacock" valve. (I.E., a valve to shut off the supply)

Also, since this is equipped with Power Assist steering, you should see the supply from the Alpha Drive seawater pump going to the Power Assist steering pump https://encrypted-tbn0.gstatic.com/s...ooler.</u></b>

I would like to know where this supply ends up after having passed through the fluid cooler!

[/color]