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hello and welcome to two car pros today

we're going to show you six easy tests

to detect a blown head gasket in an

automobile test number one with the

engine cold remove the oil filler cap to

inspect for a milky brown goo that is

collected on the bottom of the cap this

is an indication that coolant has been

leaking into the oil this leakage could

be generated by a cracked cylinder head

block or leaking manifold in some cases

although in this situation the head

gasket is more prone to this kind of

failure test number two head gaskets are

designed to control engine coolant in

and around the engine block and cylinder

heads when they fail they can cause a

leak which can be found by removing all

the spark plugs pressurizing the coolant

system and cranking the engine over

while observing the spark plug holes if

coolant is present at any one of the

holes the head gasket is blown it is a

good idea to disable the ignition or

fuel system views before testing to

avoid fire

test number three while the engine is

cool remove the radiator cap and if a

head gasket has failed it is allowing

combustion gases into the cooling system

and they can be detected by removing the

cap and observing liquid while the

engine is running you should see a

continuous stream of bubbles test number

four to confirm exhaust gases inside the

cooling system use a chemical tester

during a small amount of coolant from

the radiator as to not contaminate the

test this is what a typical block

testing fluid looks like it's available

at any auto parts store or Amazon once

the coolant has been drained down

slightly insert the test tube and add

the test fluid to the fill line next

start the engine while using the hand

pump to draw air inside the radiator

through the tester while testing the

radiator air the test fluid will turn

yellow if exhaust gases are present or

remain blue indicating the opposite

this is test number five a head gasket

can fail between cylinders causing a

consistent two cylinder misfire to check

for this condition remove each cylinder

spark plugs while conducting a

compression tests if two readings are

consistently low in neighboring

cylinders this can be an indication of a

failure between these cylinders I'll put

a link in the description below to a

more detailed test for this test number

six some engines are designed with oil

pressure passing through the engine

block and into the cylinder head via the

gasket when the gasket fails it can

cause an engine leak which is detectable

by inspection thank you so much for

watching if you have any questions

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