My 1az Rav 4 engine leaks oil from the head gasket what could be the problem?

I'm sorry, but I can't provide visual images or diagrams. However, I can describe the general order of gaskets in a 1999 Dodge Durango engine from the top going down:

1. Valve Cover Gaskets: These gaskets are located on top of the cylinder heads and seal the valve covers. They help prevent oil leaks from the top of the engine.
2. Intake Manifold Gasket: The intake manifold gasket seals the connection between the intake manifold and the cylinder heads. It helps maintain proper air-fuel mixture and prevents vacuum leaks.
3. Throttle Body Gasket: If equipped, the throttle body gasket seals the connection between the throttle body and the intake manifold. It ensures proper airflow into the engine.
4. Exhaust Manifold Gaskets: These gaskets are located between the exhaust manifold and the cylinder heads. They seal the exhaust gases and prevent leaks.
5. Head Gaskets: The head gaskets are situated between the cylinder heads and the engine block. They seal the combustion chambers and coolant passages.
6. Oil Pan Gasket: The oil pan gasket is located at the bottom of the engine and seals the oil pan to the engine block. It prevents oil leaks from the oil pan.
7. Front and Rear Main Seals: These seals are located at the front and rear of the engine crankshaft. They prevent oil leaks where the crankshaft exits the engine block.
8. Timing Cover Gasket: If equipped, the timing cover gasket seals the timing chain or belt cover to the engine block. It helps protect the timing components and prevents oil leaks.

This is common issue early sign head gaskets failure for EJ251 SOHC engine for external coolant leak. Second gen 96-99 with EJ25D is worst because when head gaskets failed, it's an internal leak that allows coolant and oil mix together in the combustion chamber to destroy engine.
You can drive it for at least 6 months or more as long as you keep top up coolant since the leak should be small at a slower rate leak. I drove mine for a while before change head gaskets. You're looking at `$1000-1200 job a dealership since you might as well change the timing belt, water pump, idlers while engine is pulled to replace head gaskets.

It will be a contributing factor. check the cat converter for blocking the exhaust pipe.

Cylinder Head
stg 1 = 40NM
stg 2 = 79NM
stg 3 = 90^
Main bearing
stg 1 = 20NM
stg 2 = 40NM
stg 3 = 90^
Big end bearing 25NM then 90^

no year, you are kidding,right?
mandatory, metal plate?
what year, what engine.
see here and see why we dont know.
like 20 engines there.

http://en.wikipedia.org/wiki/Toyota_RAV4

xa30 gen 3
this is why we are clueless, that is ok 90% of posts never say.
2.0 L 1AZ-FE I4 (petrol)
2.0 L 1AZ-FSE I4 (petrol)
2.0 L 3ZR-FAE I4 (petrol)
2.2 L 2AD-FTV I4 (diesel)
2.2 L 2AD-FHV I4 (diesel)
2.4 L 2AZ-FE I4 (petrol)
2.5 L 2AR-FE I4 (petrol)
3.5 L 2GR-FE V6 (petrol)

good engineering practice dictates that the head should be skimmed flat and new head studs used
further more the stud holes should be cleaned with a thread tap and then blown dry to remove all oil and water

For leaking head gasket it has to be replaced.For head gasket leaking and other troubleshooting,there are help links provided.Its suggested to click the link below and go through the troubleshooting procedure to confirm the issue :-----Leaking head gaskets? http://schematicsdiagram.blogspot.com/2011/12/leaking-head-gaskets.html
-----------Water in engine oil? http://schematicsdiagram.blogspot.com/2011/12/water-in-engine-oil.html
-----------How to replace head gasket on car? http://schematicsdiagram.blogspot.com/2011/12/how-to-replace-head-gasket-on-1994.html-------------How to know what is faulty Cylinder head or Head gasket? http://schematicsdiagram.blogspot.com/2011/12/how-to-know-what-is-faulty-cylinder.html
-------------- Can I just replace Head Gasket on 1991 Buick Century? http://schematicsdiagram.blogspot.com/2011/12/can-i-just-replace-head-gasket-on-1991.html Location of Head Gasket ?

http://schematicsdiagram.blogspot.com/2011/12/location-of-head-gasket-on-1994-grand.html

------------------------
HOW TO REPLACE A HEAD GASKET

http://schematicsdiagram.blogspot.com/2011/07/how-to-replace-head-gasket.html

----------------
How to replace Exhaust Manifold?

http://repairhelpcenter.blogspot.com/2011/11/how-to-replace-exhaust-manifold-on.html

-------------------
How to replace Intake Manifold?

http://repairhelpcenter.blogspot.com/2011/11/how-to-replace-intake-manifold-on-acura.html

---------------
How to replace Cylinder Head ?

http://repairhelpcenter.blogspot.com/2011/11/how-to-replace-cylinder-head-on-acura.html

---------
Is it Easy to replace head gasket?

http://schematicsdiagram.blogspot.com/2011/12/is-it-easy-to-replace-head-gasket-on.html

------------
Should I only replace head gaskets or complete head gasket assembly? http://schematicsdiagram.blogspot.com/2011/12/should-i-only-replace-head-gaskets-or.html
-----------FOR oil leak issue check the following help links:---Common Causes of Car Oil Leaks? http://schematicsdiagram.blogspot.com/2011/12/common-causes-of-car-oil-leaks.html --------Troubleshoot Car Oil leak? http://schematicsdiagram.blogspot.com/2011/12/troubleshoot-car-oil-leak.html
---------Car oil leak?

http://schematicsdiagram.blogspot.com/2011/12/car-oil-leak.html

---------
Car oil leaks from valve cover gasket? http://schematicsdiagram.blogspot.com/2011/12/car-oil-leaks-from-valve-cover-gasket.html
---------This will help.Thanks.

For leaking head gasket it has to be replaced.For head gasket leaking and other troubleshooting,there are help links provided.Its suggested to click the link below and go through the troubleshooting procedure to confirm the issue :-----Leaking head gaskets? http://schematicsdiagram.blogspot.com/2011/12/leaking-head-gaskets.html
-----------Water in engine oil? http://schematicsdiagram.blogspot.com/2011/12/water-in-engine-oil.html
-----------How to replace head gasket on car?http://schematicsdiagram.blogspot.com/2011/12/how-to-replace-head-gasket-on-1994.html-------------How to know what is faulty Cylinder head or Head gasket?http://schematicsdiagram.blogspot.com/2011/12/how-to-know-what-is-faulty-cylinder.html
-------------- Can I just replace Head Gasket on 1991 Buick Century?http://schematicsdiagram.blogspot.com/2011/12/can-i-just-replace-head-gasket-on-1991.html Location of Head Gasket ?

http://schematicsdiagram.blogspot.com/2011/12/location-of-head-gasket-on-1994-grand.html

------------------------
HOW TO REPLACE A HEAD GASKET

http://schematicsdiagram.blogspot.com/2011/07/how-to-replace-head-gasket.html

----------------
How to replace Exhaust Manifold?

http://repairhelpcenter.blogspot.com/2011/11/how-to-replace-exhaust-manifold-on.html

-------------------
How to replace Intake Manifold?

http://repairhelpcenter.blogspot.com/2011/11/how-to-replace-intake-manifold-on-acura.html

---------------
How to replace Cylinder Head ?

http://repairhelpcenter.blogspot.com/2011/11/how-to-replace-cylinder-head-on-acura.html

---------
Is it Easy to replace head gasket?

http://schematicsdiagram.blogspot.com/2011/12/is-it-easy-to-replace-head-gasket-on.html

------------
Should I only replace head gaskets or complete head gasket assembly?http://schematicsdiagram.blogspot.com/2011/12/should-i-only-replace-head-gaskets-or.html
-----------FOR oil leak issue check the following help links:---Common Causes of Car Oil Leaks? http://schematicsdiagram.blogspot.com/2011/12/common-causes-of-car-oil-leaks.html --------Troubleshoot Car Oil leak?http://schematicsdiagram.blogspot.com/2011/12/troubleshoot-car-oil-leak.html
---------Car oil leak?

http://schematicsdiagram.blogspot.com/2011/12/car-oil-leak.html

---------
Car oil leaks from valve cover gasket?http://schematicsdiagram.blogspot.com/2011/12/car-oil-leaks-from-valve-cover-gasket.html
---------This will help.Thanks.

Yes.
D-4 is the type of fuel injection - direct injection.
vvt-i : Variable valve timing with intelligence.
It is used on Toyota's 2.0L first generation AZ engine family : 1AZ-FSE
1 - First gen
AZ - engine family
F - Economy narrow-angle valve DOHC
SE - Direct injection
Vehicles using the engine include Avensis, RAV-4, Premio, Wish and Allion

same here on my rav4 1996,i just put in oil stop leak been ok for 8 months :) you will always get hatters of oil stop leaks,but they work ok,though i find don't like them have never used them