Rev up your engines,
today I’m going to tell you how to check to see if your engine is worn out inside and
blown a head gasket, now head gaskets do exactly what they say,
there’s the head of the engine with the valves, then there’s the gasket, the head gasket,
and that bolts onto the block of the engine where to pistons are,
head gaskets have lots of holes in them, they seal the pressure of the pistons going up
and down, they seal the oil that goes through the galleys to lubricate the top of the engine
and they seal the coolant holes that let coolant cool the engine so it doesn’t overheat,
and when they start to leak internally it can cost s small fortune to replace the head
gaskets in a car, in the case of this Lexus, it’s a big quad cam v8, if you’re going to
do a head gasket job on this, expect to spend thousands of dollars to do it correctly so
many times people decide, hey their going to get rid of the car if it has a blown head
gasket, so I’m going to show you how you can test
to make sure whether it’s blown or not, now if it’s really blown and it’s running
poorly all you have to do is have a cold engine, this one sat all night,
then remove the radiator cap, and start the engine, and if you see coolant and gas bubbling
out right away, that means it’s really blown, because your engine sucks in air, then inside
the cylinders the gasoline is burnt and exploded and the hot gas comes out the exhaust, and
all the exhaust gas is supposed to come out here, out the exhaust pipe,
if on a cold engine and you start it and the gas starts coming out of here, that means
that the head gasket is blown and it’s pushing exhaust gas through the radiator, but often
when head gasket leaks start, their kind of insidious, you might loose a little coolant
over time and you don’t see it leaking anywhere because the engine is burning it but it’s
not bad enough that it’s going to make things bubble out,
that’s when you need a test like this, it’s a test tube and the test liquid, you stick
it in the radiator, but if you have to, first suck out some of the extra coolant here so
that you don’t suck any of the coolant into the testing device itself,
then you put the tester over the radiator, then get this nice blue test fluid and fill
it up to the little line right here, then you put the bulb on the top and create
some suction, then you start the vehicle, and keep sucking
to suck any air that’s inside through the test material,
and in this case you can see the blue fluid has turned yellow which means there’s an exhaust
gas leak and the head gasket at a minimum is blown,
now I say at a minimum because of course if the head is warped or cracked or the block
or the gasket is blown, it’s going to let exhaust gas get into the cooling system,
it could be any of those problems and their all expensive to fix on modern cars,
now when I was a young mechanic in the 1960’s we’d do head gasket jobs for maybe $200 bucks
or something it wasn’t that big of a deal, but today it can cost thousands on modern
cars, and hope that your head is not warped or your
block is warped, modern heads and blocks cost so much money it’s really not worth fixing
most cars, it’s more than the value of the car, because they generally don’t blow until
the get older, now if you’re really short on funds and your
head gasket it starting to blow, there are various head gasket sealers out there,
each of them have an advantage and a disadvantage, steel seal which I talked about years ago
was the best one I ever found, but unfortunately that design really doesn’t
work with modern antifreeze, so you’d have to empty out all the coolant out, get it all
out, run it with water, and then take the thermostat out, sometimes that stuff can last
for quite some time but you can’t mix it with modern antifreeze,
now for modern cars with long life antifreeze, the best sealer that I found is the bars head
gasket sealer, I get it at autozone it’s $30 and that is the best one if you want to try
to put some sealer in to get a little bit more life out of it,
but of course any sealer is just a big gamble, what you want is,
not to have a blown head gasket in the first place, and to do that you want to keep clean
antifreeze in your car, the old stuff you had to change every 3 years or 30,000 miles
but some of the modern coolants go 7 years 150,000 miles, you don’t have to change it
all that much but if you keep your car a long time change the coolant that keeps the head
gasket from corroding, and of course the number one way to prevent a blown head gasket is
never overheat your engine, as your car is running, the heat of the engine is taken away
by the cooling system, if the cooling system fails, you got a leak
or the water pump stops working, the heat builds up and modern engines have
a lot of aluminum parts, aluminum will warp under very low temperatures,
you can get an aluminum cylinder head, you can stick it in the oven in your house and
then it can even warp even from that small amount of heat and it gets lot hotter inside
the engine of a car, so you never want your engine to overheat
and of course a lot of people think oil lubricates the engine, but engine oil also does a lot
of cooling of a modern engine, so you want to have good clean oil too, because
if you let the oil get too old and dirty, that can make an engine overheat and of course
dirty oil has more friction and that can do damage do gaskets too by just the extra friction
of dirt passing by the gasket and corroding it,
and since this is mechanic monday, I giving away one of these leak block tests, all you
got to do to have a chance to win is a place a clean non offensive comment on the YouTube
comments below to get a nice block leak tester kit to see if your engine really is starting
to blow a gasket, so if you never want to miss another one of
my new car repair videos, remember to ring that bell!