Timing chain gasket leaks oil - 2010 Toyota Corolla 1.8

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.

Oil leakage in the timing compartment of an engine can be caused by a variety of factors. Some common causes include:

1. Worn or damaged valve cover gasket: The valve cover gasket is responsible for preventing oil from leaking out of the timing compartment. If this gasket becomes worn or damaged, oil can leak out of the compartment.
2. Worn or damaged timing chain cover gasket: The timing chain cover gasket is responsible for preventing oil from leaking out of the timing compartment. If this gasket becomes worn or damaged, oil can leak out of the compartment.
3. Worn or damaged oil pan gasket: The oil pan gasket is responsible for preventing oil from leaking out of the timing compartment. If this gasket becomes worn or damaged, oil can leak out of the compartment.
4. Worn or damaged crankshaft seal: The crankshaft seal is responsible for preventing oil from leaking out of the timing compartment. If this seal becomes worn or damaged, oil can leak out of the compartment.
5. Worn or damaged camshaft seal: The camshaft seal is responsible for preventing oil from leaking out of the timing compartment. If this seal becomes worn or damaged, oil can leak out of the compartment.
6. Worn or damaged Timing chain tensioner: Timing chain tensioner is responsible for maintaining proper tension on the timing chain. If this tensioner becomes worn or damaged, oil can leak out of the compartment.
7. Worn or damaged Timing Chain: Timing chain is responsible for maintaining proper timing of the engine. If the timing chain becomes worn or damaged, it can cause oil leakage in the timing compartment.
8. Low oil level: If the oil level in the engine is low, it can cause oil to leak out of the timing compartment.

It's important to address oil leaks as soon as possible, as they can lead to serious engine damage if left unchecked. To determine the exact cause of oil leakage, it's best to consult with a mechanic or take the car to the service center.

Is this for a gasket or for the timing chain replacement ?
It's pretty complicated engine but that seems high for just a gasket.
It may be that you were quoted for a timing chain replacement along with the gasket repair.
Ask for clarification and get a second estimate.
If it's not leaking that much and little oil spots/droplets aren't showing up on the rear of the vehicle and you check the oil all the time, $3900 will buy a lot of oil.

if true, its bad.
easiest post ever.

also some covers have porosity issues, some engines have TSB warnings , and has been true since first engines every made.
but careful checking with the UV dye, tells the tale.

Yes, oil commonly leaks from its valve cover gasket the only way to fix this problem is buy replacing the gaskets. -----------------------------------------------------------------------------------
car cables & obd conectors

You should try your oil pan gasket or your timing chain gasket cause that I'm taking mine to the shop to see what it is exactly buy I don't have the time to look at the leak exactly ill let you know what it is exactly though ok.

u might check that the oil filter gasket did not slip when it was put on and have the oil running down over the pan . this car is not known to have oil leak problems.if i am thinking right it has a 3.4 liter and they are known (like there cousin the 3.1 )to leak anti-freeze from the intake gasket.

CHECK FOR LEAKING WATER PUMP WEEP HOLE OR GASKET.ALSO CHECK WATER PUMP HOSE FOR LEAKS.IF ALL LOOKS GOOD.YOU COULD HAVE PINHOLE LEAKS IN RADIATOR CORE LEAKING ON FRONT OF ENGINE OR INTAKE MANIFOLD GASKET LEAKING COOLANT.

check the timing chain tensioner gasket assembly and replace those gaskets and the rocker cover gasket you took off to do the chain work

u didnt indicate what is leaking oil or anti-freeze there is a gasket for the timing chain cover (oil) but the water pump is there also (anti-freeze)