cooling Mod??

[malibill]

Hi Bill here I am looking for the "how to" on a cooling mod that is installed on the head to upgrade cooling system .. I tried searching forum but can not seem to locate it.. I have a 03 mm that I would like to install the mod on.. I was told it is installed on the drivers side head but can seem to find any information on it.. If anybody know`s where I can locate information and parts please let me know Thank you., Bill

[Bob Mathis]

You can see if Zack has any all ready made. They are made to go on the top freeze plugs on both heads at the rear.

[Logizyme]

The issue is a lack of flow around the backside of cylinders 4 and 8. This causes the rear of the cylinders to run hotter than the rest and more prone to failure. Most modular engines supply coolant to the heater core by way of a fitting installed on the rear of the passenger side cylinder head, which promotes flow around the backside of cylinder 4. The drivers side head almost never has factory fittings and thus caused #8 to be the most common to overheating related issues. In the case of the Marauder, heater core coolant is supplies by a fitting on the coolant cross over tube at the front of the engine, and neither cylinder head has desirable flow around the backside. On the 4.6 4v, the cooling mod typically consists of removing a freeze plug from the rear of the engine on each head, typically the freeze plug that is facing upward on the same plane as the intake manifold gaskets, but other options include the freeze plug on the rear of the head which is harder to access. Some sort of fitting is installed of the place of the freeze plugs and hoses connected to promote flow. These hoses may be connected to the heater core supply or ran forward to join the cross over tube.

This being said there are plenty of different versions of the "cooling mod". Zack on this forum builds a popular and affordable version that works fine. There are plenty of fancy ones around you can buy for a premium. How you connect your hoses is up to you and the mod fittings you choose. Also if you get an idea of what makes up the mod fitting you could try to make your own.

On stock Marauders most owners choose to "T" the two mods together, then run a hose that joins with the heater supply hose to promote flow.

[lji372]

^^^^^^^well said :burnout:

[03Merc]

Does anybody have pictures they can share of their N/A Cooling Mod and how it was installed?


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[fastblackmerc]

I believe Zack has pictures of his.... somewhere.

[BeeDamn]

What is the diff between the N/A fitting and the S/C Eaton fitting?