How can you tell if your head gaskets gone?

My brother inlaw has had a look at my motor and in his opinion the head gaskets gone.

Answers:
If the coolant enters the crankcase it mixes with engine oil. Of course oil and water don't mix very well but the presence of ethylene glycol (anti freeze) and the agitation caused by the crankshaft and other moving parts can whip the mixture of coolant and oil into a milkshake.

If the coolant is forced out of the exhaust system it is usually heated by the hot exhaust manifold and the rest of the exhaust system. This results in a sweet smelling steam emanating from the tailpipe. The steam is rather persistent, that is it will hover in the air and not dissipate like the normal steam that comes from the combustion process.

Testing an automobile engine for a blown head gasket is pretty straightforward. The first check is to see if there are combustion gasses getting into the cooling system. Take a sample of the coolant and go to the local radiator shop and request that they analyze the coolant for the presence of hydrocarbons. If they are present then it is most likely that you have a blown head gasket.

Another check is to look at the oil of a warmed up engine. The antifreeze in the oil will whip it up into a frothy brown mixture that looks like a milk shake. If it looks like chocolate mousse then you probably have a blown head gasket.

Another check is to fill the cooling system to the brim and remove the radiator cap. Do this when the engine is cool. Start the engine and race it. If there is a compression leak and the gasses are going into the cooling jacket then the gasses will displace the coolant. Since the cap is off the coolant will be pushed out of the radiator. You probably have a blown head gasket.
Drain the motor oil and check for coolant in the oil. Also, if you have to add coolant all the time, but you don't see any leaks, it's possible it's getting into the motor and burning up.
OIl in the radiator. white smoke from the tailpipe. Loses coolant and oil however no puddles under the car.
coolant in the oil
It puts water in the oil, the oil will look white, kind of like milk, the car may not crank, it may run really bad and have a really bad skip int it.
your coolant level will be consistently going down and your car will blow white smoke that will linger and smell like antifreeze
You get one or more of the following symptoms:
1) Water in the combustion chamber - you get loads of steam out of the exhaust.
2) Oil in the combustion chamber - you get black smoke out of the exhaust.
3) Water in the oil. The oil turns into a grey lumpy mess and you get more and more of it.
quite a few things to look for some or all maybe present.
what colour is the oil? if it resembles mayonaise then water is mixing with it. lots of pressure in the cooling system when releasing the rad cap.
sometimes the car "kettles" meaning you can see water coming out the exhaust and the car will run rough.
well worth letting a garage check it out if you are unsure!

forgot to add if its a rover with K series engine your brother in law is probably right
oily water and watery oil.

brown scum under your oil filler cap
take the heads out and if there is not gasket than its gone. actuly quiet common
lots of white smoke from the tailpipe usually
check the oil after it has been setting is it white milky,
but some case it does not get in the oil,start it check around the head see if you can see any bubbles
The oil looks milky brown (water in the oil) Steamy smoke out the exhaust pipe(Water leaking into exhaust) Oil mixed with water in the radiator.
Is there coolant in the oil,or visaversa.Also is it overheating?white smoke out the exhaust with a miss in the engine
There would be oil around the head gasket after the engine has been running for a while.
It will also cause your engine to run hot so you will notice the radiator getting very hot.
usually if the gaskets gone you either have water in your oil making it look milky or/& you have a major loss of power..it would be leaking air or water somewhere along the head
knackered engine.
engine miss fire, thick white smoke from exhaust, coolant system pressurising, these are a few symptoms
the car runs hot alot and u can see water around the heads and check the oilstick if your oil is milkey water is mixing with the oil
DOES YOUR EXAUST BLOW WHITE SMOKE? IT IS A EXCELLENT SIGN.
You can do a chemical test to check it or as others have said look for bubbles in the cooling system tank .Be careful not to get to close in case you get scalded.Regards Mick
Did it leave you a note to say when it was coming back.
Loss of power and misfiring.

Normally a gasket 'blows' at its weakest point between two adjacent cylinders.

In this case coolant may not necessarily leak into the cylinders.

Beg, borrow or even buy a compression tester.

Remove the spark plug leads..

Remove one spark plug at a time and replace with the compression tester. Turn the engine over.

Two cylinders will show viable readings while the other two will indicate a loss of compression if the gasket has blown.

You are, in fact, checking the pressure in each cylinder. Refer to the appropriate car manual for technical details.

Gaskets are easy to replace if you have a reasonable knowledge of car mechanics.

It is essential to use a TORQUE wrench to undo and afterwards replace the cylinder head bolts in the correct sequence and to the correct Torque settings.

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