03 Marauder head cooling mod

[daniel.drives]

Hello All,

I think I've looked in enough places for this to be worth asking: has anyone done a write up on the head cooling mod for the early runs of the 4V engine? I've heard from a couple places that not enough coolant gets to the back of the head, how do you remedy this?

While we're on the subject, what was the OEM thermostat setting, and how cold can you safely go?

Thanks,
Daniel

[fastblackmerc]

To fix the head cooling issue, buy and install a rear head cooling mod. I'd do it on all 4V module engines. Search the internet as there are a number of kits out there and videos detailing the installation.

One thing though, if the damage has already been done, installing the cooling mod won't fix anything.

I believe the stock thermostat was 188 or 190. I'm running a Reisch Performance 170 (https://reischeperformance.com/F4Ddata.html) with a MartyO tune optimized for the thermostat. Installing a lower temperature thermostat without an optimized tune buys you nothing.

[RubberCtyRauder]

You have to adjust when fan comes on if changing stock stat. It is pcm controlled. Stock was 195 I'm pretty sure. Changing stat alone won't help you. Must be tuned for new stat

[daniel.drives]

Thanks for the info. At 183k miles, I'm sure whatever damage could happen has happened, but I'll be doing a rebuild at some point and wanted to make sure it goes together right.

I'll get in touch with Marty, seems like an SCT is in my near future.

[RubberCtyRauder]

Marty will get you set up!

[fastblackmerc]

I also noticed that burping the cooling system is easier with the rear cooling mod installed.

[03Merc]

Put mine on at 100k, some said it was too late, I'm at 200k now. No worries whatsoever.


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[Ambitious1]

Has anyone have a step-by-step instructions on installing the head cooling mod? The previous owner of my MM did it, but I don't think it was done properly. I am going to re-do it in the next month when it's warmer and I want to do it the best method possible.

[fastblackmerc]

Has anyone have a step-by-step instructions on installing the head cooling mod? The previous owner of my MM did it, but I don't think it was done properly. I am going to re-do it in the next month when it's warmer and I want to do it the best method possible.

If your just going to redo it, instructions depend on the type of mod.

If your going to install a new mod, a google search shows 150K results.

[rickm]

Is there any one kit that is more suited for a 100% stock car? My engine is out and I want to do this mod before it goes back in. I see the kits that go between the rear of the head and firewall, at the rear of the intake, different hose configurations etc...

[GreekGod]

Me too -- "Is there any one kit that is more suited for a 100% stock car? "???

[fastblackmerc]

Me too -- "Is there any one kit that is more suited for a 100% stock car? "???

I have an original DR rear head cooling mod.