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F350 6.0 diesel coolant flush...

1971Chevelle

1971Chevelle

Veteran Member
Senior Member
A friend of mine has one of these abominations and it is recommended to do a coolant flush every 40,000 to 50,000 miles. We have looked up a couple of procdures for doing this, and it seems pretty straight forward. However, this one has a coolant fliter kit installed, so we don't know if anything should be done differently. Some have said that if you use the chemical flush agent, then you need to backflush the oil cooler, as it can become clogged and stop working.

Has anyone here done a flush on one of these that has the coolant filter kit installed? If so, did you just do the flush normally, or add steps to the procedure? Below are the two links that I sent to him for the flush procedures. Let me know.

6.0L Power Stroke Cooling System Flush & Service Procedures

How to flush the cooling system on a 6.0L Power Stroke diesel and replace the thermostat and radiator hoses. A technical discussion about engine coolant selection and many of the inherent cooling system problems is also featured. Neglecting to periodically flush the engine coolant in a 6.0L...
www.powerstrokehub.com

www.xtremediesel.com

Oil Cooler Flush - Ford 6.0L Powerstroke - XDP Blog

The 2003-2007 Ford 6.0L Powerstroke oil cooler is prone to blocked cooling passages from leftover casting sand and other debris.
www.xtremediesel.com
 
BTW, my 6.0L has been super reliable, it almost has 200,000 on it and it goes all over the country pulling a camper.
 
I've just flushed it like normal and replaced the filter. I always replaced the coolant filter (mine had the aftermarket bypass filter) every time I changed the oil. That's kept the coolant clean and free of debris.
 
What are his deltas at 2000 RPM or 65 MPH for 10 miles flat ground. ECT and EOT should be no more than 15 apart.

Go to Wal-Mart and buy 10-15 gallons of distilled.

Buy at least 2 gallons of ELC coolant for diesels. Do not use Green or Gold.

Get at least 1 Fumoto valve for block draining, 2 if you want to take the starter off, not a hard job.

Open the drain cock, drain coolant. Install Fumotos. drain block.

Remove the thermostat ( use anti seize on bolts when reinstalling)

Fill cooling system with garden hose. Turn heater on full blast. Run until hot. Drain radiator and block. Repeat.

Repeat until nothing but clear water comes out.

IF deltas are 15 apart or more replace oil cooler and EGR cooler now. EGR cooler needs to be an IPR or Bulletproof high flow. EGR delete is another option. Now is a good time to replace the waterpump.

IF you want to flush block with VC-9 do it before the oil cooler is replaced.

Make sure thermostat is reinstalled.

Once coolers are healthy drain system. Fill with distilled water. Repeat 4 times. On last flush drain radiator only and fill with concentrate ELC.

Now your cooling system is happy and healthy. Coolant filters are ok but if properly flushed not needed, I have one but it filters after the coolers so really does no good.
 
I used to hook a garden hose to my heater hose line with a prestone flush kit. Run the engine with full pressure from the hose.
Water would flush out the top of the radiator. Worked really well.
You can't do that with a diesel ?
 
Nashville Cat said:
I used to hook a garden hose to my heater hose line with a prestone flush kit. Run the engine with full pressure from the hose.
Water would flush out the top of the radiator. Worked really well.
You can't do that with a diesel ?
Click to expand...

Not with the 6.0 powerstroke you can't.
 
Nashville Cat said:
Found this on Amazon - oil cooler flush kit

Click to expand...
Easier said than done. There is a cap on the cooler you have to access. I have an IPR coolant filter, I made a tool to adapt it.

My instructions are the 6.0L way of doing it.
 
6.0L engines were built with Fold Gold Coolant. It is fine till it gets old and the silica drops out, it flows and plugs the oil cooler starving the EGR cooler of coolant. Exhaust gasses heat in the EGR cooler causing it to rupture, coolant leaks into intake, increasing head pressures and blowing head gaskets and hydrolocking the system.

Casting sand is also an issue, the flush procedures remove most of it. Switching to ELC and replacing the EGR and oil coolers allows for flow of coolant to improve and keep deltas down.

I tried a external cooler, did no help, went back to internal cooler. Almost 100,000 miles since I did it and going strong.

Maintenance on a 6.0L is key to a happy and healthy 6.0L and no power adders until heads are studded. My engine is stock on TTY bolts.
 
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