OIL LEAKAGE CAUSES - 1999 Ford Expedition

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.

not told what leaks and to where.
we can no see leaks blind in text box.
axles?
autotrans
manual trans.

cause are only 3.
bad gaskets and seals
overfilled. (never do that)
or on ENGINE ( )PCV valve clogged and engine pushes oil out
rear main seal and to the TC and bottom bell housing leaks oil
and is not the transmission, leaking. fooling owners.
oddly
other causes, 4wd axle vents clogged with mud or bug nests>

no engine told
no transmission told at all(options day1 new car)
RWD
Front; with Mitsubishi R4A51 Transmission
or Front; with Mitsubishi V4A51 Transmission

P1353 Valve lift control cylinder X - small lift
Possible fault causes:
- Fuel injector faulty or borderline (opens too late/ not long enough/ not enough/ leaking)
- Valve lifter of the specified cylinder faulty (intake valve of the specified cylinder gets stuck during the small lift)
P1372 Valve lift control, bank 1
Possible fault causes:
- Insufficient oil supply for faulty bank 1 (e.g., due to faulty scavenging restrictor in the cylinder head, dirt in the oil circuit, ... )
- Greatly differing exhaust backpressure values between the banks (e.g., due to constricted or blocked opening of an exhaust branch)
- Loose contact or corrosion on connectors or lines
- Solenoid hydraulic valve for valve lift control on bank 1 faulty
- Incorrectly adjusted timing of the intake or exhaust camshaft of a bank
- An oxygen sensor is aged or faulty
P2404 Leakage diagnosis pump, Reed switch
Possible fault causes:
- Vacuum system leaking
- The system consists of the mechanical vacuum pump (on the vehicle engine), the leakage diagnosis pump, the intake pipe switch-over valve and, where appropriate, the exhaust flaps in the rear muffler
- Vacuum pump has mechanical fault
- Tank vent valve stuck in closed position
- Purge-air line between tank vent valve and carbon canister blocked
- Short circuit to B+/ground or open circuit in signal line
- Leakage diagnosis pump faulty

The fault cods EDC 03779,03778 have overlapping causes consist leakage of injectors,valve ,pipe but in some time malfunction in the high pressure pump , any one agree with me or there is any addition causes.

03779.....EDC ............ Rail pressure: Leakage in quantity compensation

03778.....EDC ...................Rail pressure: Leakage in overrun conditions

First, it is made out of plastic. I would get a new seal, silicone it on, then use more silicone on that, then mount it. Let it set for an hour, then add the oil.

Changing the weight of oil or going synthetic

check that the oil filter is tight ( hand tight plus 1/4 turn) over tight causes problems with leakage . Check that there is only one gasket under the filter.

Remove the OIL FILLER CAP- is there a white pastr under the cap itself ? If there is, you have antifreeze mixing with your oil. Causes can be a cracked block, bad head gasket, warped head ALSO check the end of the tail pipe for a white powder, same diagnoses.

Usually observing the dripped fluid on the ground as first encounter to acquire if is gasoline leak or oil leakage. A gasoline leakage should have been caused due to overpump at the gas station. Second, a leak from the engine if is antifreeze overflow because of over filling the hydrant with water causes overflow when AC is turned on for the first time. Third, the engine oil would dispense when too much was put in container. The reason is as vehicle precaustion, else the car would not start due to too much oil lubricant. Perform a vehicles fliud levels inpsection to acquire if any require refill due to the leakage. Alternatively, if any requires reducing for example, a mechanic would determine how to dispense the old fliuds in replacement of new oils. The vehicle should perform better. Usually changing fliuds causes efffecient engine performance,least heating, AC cooling capacity, and least polutant generation like air or gasoline leakages.

POSSIBLE CAUSES - VALVE GUIDE OILS SEALS OR PISTON RINGS - I WOULD DO A WET AND DRY COMPRESSION CHECK AND A LEAKAGE TEST ON ALL CYLINDERS FIRST - A LEAKAGE TEST IS WHERE EACH CYLINDER IN TURN IS PUT ON THE TOP OF ITS FIRING STROKE IE PISTON AT TOP A BOTH VALVES CLOSED CONNECT AN AIR LINE AND PUT IT UNDER PRESSURE - LISTEN FOR HISSING BUY REMOVING THE OIL CAP - A LOUD NOISE - YOU HAVE PROBLEMS - ANDY