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Engine oil leakage into cooling system

Tiny
OZYLIVE
  • MEMBER
  • 1999 LINCOLN TOWN CAR
  • 4.6L
  • V8
  • 2WD
  • AUTOMATIC
  • 265,325 MILES
Hello,

Engine oil level was dropping suddenly and mixing with coolant in the cooling system due to which car went into overheat. Flushed clean the cooling system and changed the gas kit on the engine cooler. Problem subdued for a while and reoccurred again.

Parked car for a month and appears the mixture of oil and water has entered engine.

Engine has not seized yet. Kindly advice how to identify the problem and cause and how to solve it.

With much anticipation,

Regards,

Osman.
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Monday, August 27th, 2018 AT 3:01 AM

8 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Good morning.

It does sound like the oil cooler is leaking oil into the cooling system. If you have an oil cooler, it will be part of the oil filter adapter assembly. You can tell by the cooling hoses that run to the cooler.

If you do not have an oil cooler, the block may have been damaged for the overheat. It would need to be inspected for the failure.

Roy
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Monday, August 27th, 2018 AT 5:50 AM
Tiny
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Hi Roy,

Thanks for the quick response. My car has an oil cooler system with two black color hoses running into it which, the mechanic removed, cleaned and reinstalled leading to a short trip of about five hundred miles after which it happened again where oil mixed with coolant and started overflowing out from the radiator/coolant container.

Question I have is, how to identify or tell if the replacement unit of cooler is in good condition or not as I will have to get it from a used parts yard?

Also, how can I guaranteed clean the water that has entered the engine and other debris without opening up the head?

Thank you for your valuable time and advice.

Regards.
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Monday, August 27th, 2018 AT 9:15 AM
Tiny
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  • MECHANIC
  • 52,797 POSTS
You said he removed and cleaned? Cannot clean as it is leaking internally and must be replaced.

Did they replace the cooler?

Roy
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Monday, August 27th, 2018 AT 10:06 AM
Tiny
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Well, the cleaning process was simply washing it with soap/detergent water thoroughly.

How can I tell if the unit I buy for replacement is good and wont leak internally?

Thanks!
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Monday, August 27th, 2018 AT 10:30 AM
Tiny
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The cooler has not been replaced yet.
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Monday, August 27th, 2018 AT 10:32 AM
Tiny
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  • MECHANIC
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Replace it. That is the cause of the oil in the coolant.

Roy
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Monday, August 27th, 2018 AT 11:10 AM
Tiny
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Great!

Thanks for the tip, Roy. Is there a way to check the oil cooler unit for defects before installing?

Also, I would really appreciate if you could shed some light on how to get an engine flush (cleaning) done so that I do not have to open up the engine head.

Have a good one!

Regards,
Osman
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Monday, August 27th, 2018 AT 10:04 PM
Tiny
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A new cooler will have a warranty against leaking.

If you use a used one, you need to have it pressure tested to be sure it is good.

Use sea foam for the oil and perform the procedure two times.

Roy
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Tuesday, August 28th, 2018 AT 1:25 AM

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