Finding out if your Ford 4.6L or 5.4L car (pick up, SUV, or van) has a blown head gasket is not hard do to and in this article I'll show you four of the most effective tests that you can do to find out.
Two of these four tests, can be done in under 10 minutes. The third one involves doing a compression check and the last one involves using a combustion leak tester (commonly known as a block tester).
I'll guide you step by step thru' all 4... more than likely, the first two test will confirm a blown head gasket (if indeed this is what has happened to your Ford vehicle).
To make it easier to navigate this article, here are its contents at a quick glance:
You can find this tutorial in Spanish here: Cómo Verificar un Empaque de Cabeza Quemado (4.6L, 5.4L Ford) (at: autotecnico-online.com).
TIP 1: You should never open a radiator with a hot engine. The coolant will be under pressure and opening the radiator cap can cause hot coolant to scald you as it coming spraying out.
Be careful, take all necessary safety precautions and use common sense. Your safety is your responsibility.
TIP 2: When performing a compression test, you'll need a helper, that way... as the engine cranks, you can keep your eyes on the compression gauge.
As you set up the compression gauge (in the spark plug hole), have your helper wait outside of the vehicle, till you're done and you're safe distance from the engine. Once you have recorded the compression value, have you helper get out of the vehicle and wait outside (of it)... till you have finished setting up the compression gauge in the next spark plug hole.
The most common cause of a blown head gasket is that the engine overheated because: 1) Fan Clutch is not working, 2) All of the coolant leaked out of the engine and you kept driving it this way. 3) Thermostat went BAD and is stuck closed and the coolant could not circulate. The most common symptoms a blown head gasket are:
One of the most common end results of a blown head gasket is coolant entering the crank case and mixing with the engine oil. So, our first test is to see if the engine oil is mixed with coolant.
This is what you need to do:
Pop the hood on your Ford 4.6L, 5.4L van (or car, pick up, SUV) and once open, pull out the engine's oil dipstick.
Now, check what the color of the oil is and how thick it is. What you're doing is confirming one of two things:
Now, let's find out what each of the two results mean:
CASE 1: The engine oil, on the dipstick, is a light tan, like coffee with too much cream, this is bad news and tells you that the head gasket or head gaskets are blown. The solution to this problem is replacing both head gaskets.
The biggest cause of coolant mixing with the engine OIl is severe overheating. More specifically :
1.) When the engine overheated, the cylinder head or heads (which are made of aluminum) warped. This warpage causes the head gasket (or gaskets) to burn.
2.) At this point, the head gasket or head gaskets can no longer keep coolant and engine oil separate. And so...
3.) ...this leads to the coolant entering the engine oil pan.. As both oil and coolant mix... the resulting combination gets thick and becomes an off-white color.
CASE 2: The color of the engine oil is normal, Although this is a good result, you're not out of the woods yet. I suggest doing the two other tests I'm presenting in this article. Go to TEST 2: Compression Pressure and/or Exhaust Gas Exiting the Radiator.
Here's why: Normally (about 90% of the time) when a head gasket gets blown on a 4.6L, 5.4L Ford van (or car, pick up, SUV)... coolant will enter into the crankcase and mix with the engine oil. This is not an absolute truth. Thankfully, there are several more tests that you can do to make sure that the head gasket is really blown or not. The next test is to see if the engine's compression/ combustion gases are escaping thru' the radiator.
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