Oil & Fuel TC40DA: Oil change nightmare.

[prunus]

Still a problem in 2025. My tc40a made the big bang after oil change but started with white smoke which clears after 2 minutes or so. Runs OK after warm up.
I replaced injectors with no improvement. Compression test was around 500 and pretty uniform. Probably going to change head gasket next. Any help appreciated. The saga continues.

 

[POGuy]

I am dumbfounded. That is a seriously messed-up design! All because of a quick fix to go to an internal crankcase breather?!?

I wonder how many other engines could suffer the same fate!

I have never worried about pouring oil into an engine, other than trying to keep it from dribbling all over....

It's certainly good that you have such a good relationship with your dealer and he's willing to go to bat for you- give him a pat on the back!

Pics are great, and thanks for posting!!

Government regulations aside, that was a cheap ass bungled solution on new Hollands part. Adding oil to an engine should NEVER cause catastrophic damage unless you forgot to refill after an oil change!

 

[JimR]

If the manufacturer had put in larger oil drain back holes or more holes this never would have happened. The designer should be strung up.

 

[Gator6x4]

Pouring engine oil directly into the valve cover port of a diesel engine
can potentially cause damage, especially if done improperly or excessively.
Here's why and what can happen:

• Overfilling: If you overfill the engine by pouring too much oil into the valve cover, the excess oil can lead to a rise in internal pressure, potentially damaging seals and gaskets, causing leaks and other related issues says Shield Oils.
• Aeration and foaming: Too much oil can cause the crankshaft to churn and aerate the oil, turning it into foam. This foamy oil can hinder proper lubrication, leading to increased friction, overheating, and potential engine failure.
• Oil entering combustion chamber: Excess oil can be forced past piston rings and valve seals into the combustion chamber, leading to oil burning, spark plug fouling, and increased emissions says Shield Oils.
• Damage to catalytic converter: Burning excessive oil can release contaminants into the exhaust stream, potentially degrading the catalytic converter and affecting emissions performance.
• Engine runaway (diesel engines): In severe cases, particularly with diesel engines, massively overfilled oil can cause "engine runaway," where the engine loses control of its speed due to the unregulated combustion of oil mist/fumes drawn into the intake manifold. This can lead to serious damage and even engine destruction.

The proper way to add oil:

1. Use the designated oil fill port: The oil fill port is typically located on top of the engine and is marked with an oil filler cap.
2. Use a funnel: A funnel helps to prevent spills and ensures the oil goes where it's supposed to.
3. Pour slowly and gradually: This allows the oil to settle and prevents overfilling.
4. Check the oil level with the dipstick: After adding oil, wait a few minutes for it to settle, and then use the dipstick to check the oil level, ensuring it is within the recommended range (between the 'FULL' and 'ADD' marks).
5. Avoid overfilling: Only add the necessary amount of oil to bring the level to the 'FULL' mark.

In summary, while adding oil to a diesel engine, it's crucial to:

• Use the correct oil type and quantity as specified in your owner's manual.
• Use the designated oil fill port.
• Add oil slowly and in increments.
• Check the oil level regularly with the dipstick.
• Avoid overfilling at all costs.

If you suspect you've overfilled the engine oil, drain the excess immediately or have a mechanic do it for you, notes Urb's Garage. Avoid driving the vehicle until the issue is corrected to prevent further damage.