Cooling system maintneance is a very simple but necessary
item to do to keep the engine running later in life. Diesels, particularly the
Powerstroke, are prone to a problem called cavitation. This is where the vibration in the
engine causes the linings in the cooling system to eat themselves away and causing block
failure. To prevent this, a sacrificial chemical called SCA4 needs to be added to the
system periodically using special test strips. SCA4 and the strips can be purchased at
major diesel stores such as your local International dealer, Ford Dealer (Additive known
as FW-16), or through Diesel Injection Service
over the Internet.
Ultra short version courtesy of Steve Pepin:
1) Open the fill cap and drain the system through the
2) Refill with fresh water to the capacity of the system.
3) Turn on the heater and run the engine until normal operating temperature is reached.
4) Turn off the engine.
5) Repeat steps 1 through 4 until all the water comes out clear.
6) Drain the system through the petcock. There will probably be water in the reservoir --
7) Calculate the correct amount of coolant for the proper mixture and pour it in.
8) Fill the rest of the way with clear water.
9) Run the engine to normal operating temperature and top off the system with water.
10) Add the correct level of additive.
11) Enjoy the rest of your day.
The correct level of additive is around 2.0-3.0. Any more is a waste.
Offical Ford Motor Company way of changing the Coolant
courtesy of Stephen:
DRAINING,FILLING AND BLEEDING COOLING SYSTEM DIESEL
About 80% of the coolant system capacity can be recovered
with engine in the truck.
Note: THIS IS FROM A WORKSHOP MANUAL
1. Release the pressure in the cooling system by slowly turning the pressure relief cap
one half turn.
When pressure is released, remove the relief cap.
2. Place a suitable container below the radiator draincock.
If equipped, disconnect the coolant hose at the fluid cooler.
3. NOTE: Do not remove draincock until cooling system is
Open the radiator draincock and remove the cylinder
drain plug (if equipped) to drain the coolant from the cylinder block.
1. Follow the drainning procedure in reverse order
2. Add the proper engine coolant mixture to the degas
bottle (the clear bottle on top blk cover)
3. Move the temp blend selector to the full warm position
(middle of blue and red dial) Editor's note: Set the A/C Temperature controls to a
4. Run the engine until it reaches operating temp at
2000rpm for 5 min.
5. Turn off the engine and allow the cooling system to cool
6. Add the proper engine coolant mixture to the degas
bottle until the coolant is between the "COOLANT FILL LEVEL"marks.
7. Repeat steps 1 - 5 until the degas bottle level is OK.
1. Select max heater temp and blower motor speed setting.
Position the vent selection control to discharge air through the A/C vents in the
2. Start the engine and allow to idle. While the engine is
idling, feel for hot air at A/C vents.
3. CAUTION IF THE AIR DISCHARAGE REMAINS COOL AND
THE ENGINE COOLANT TEMP GAUGE DOES NOT MOVE,THE ENGINE COOLANT LEVEL IS LOW IN THE ENGINE
AND MUST BE FILLED. STOP THE ENGINE, ALLOW TO COOL AND FILL THE COOLING SYSTEM AS
Start the engine and allow to idle until normal operating
temp is reached. Hot air should discharge from the A/C vents. The engine coolant temp
gauge should maintain a stabilized reading in the middle of the NORMAL range and the upper
radiator hose should feel hot to the touch
4. Shut the engine off and allow it to cool
5. Check the engine for coolant leaks.
6. Check the engine coolant level in the degas bottle and
fill as necessary
FLUSHING ENGINE AND RADIATOR
1. Never open a hot cap that is under pressure. once the
pressure is released,remove the pressure relief cap. Drain the cooling system per cooling
system draining, filling and bleeding section
2. Remove the water thermostat
3. install the water hose connection without the water
4. Use cooling system flush-all, flush kit hardware pkg.
and drain kit. Editor's Note: This a FoMoCo kit used in shops...
5. Install the water thermostat
6. Backflush the heater core if necessary
7. Fill the cooling system
1. Never open or remove reliefcap while hot or under
2. Partially drain the cooling system
3. NOTE refer to the cooling system flush-all operating
4. Fill the cooling system
Strangely enough, adding the coolant additive is not on the
list. Add it last to the proper 2.0 - 3.0 level.