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Oil mixed with coolant?

Tiny
ANDRIN ATEM
  • MEMBER
  • 2015 AUDI A7
  • 18,745 MILES
WA1LGAFE8FD016685. My Audi q7 3.0T supercharged has an issue with oil mixing with coolant after I took out the intake manifold to replace a PCV water pipe which connects direct to the inlet where the thermostat is located. After replacing I started engine notice cylinder 4, 5, 6 had firing, took of the coil and plug on the cylinder 4 noticed coolant coming out from the plus hole, then later pull out the dip stick, noticed it's all milky. However, the car does not have over heating issues, it started when the car started complaining of check coolant level stop the car and check coolant level. Please can you help me with possible areas and cause of oil mixing with coolant of this particular model, also help me with the coolant system diagram, oil and air diagram so I can know how to engage a proper fix. Any further information will be of great help to me, I am in Cameroon, no Audi companies but I can do myself if I get guide and directives.
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Saturday, March 2nd, 2024 AT 5:03 AM

10 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,885 POSTS
Hi,

I'm not sure I understand what was done. Do you mean this started after the lower intake was removed and reinstalled?

Do me a favor. I attached a pic below of the coolant flow throughout the engine and engine compartment. Take a look at it and let me know what you had to replace.

Take care,

Joe

See pic below.
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Saturday, March 2nd, 2024 AT 2:38 PM
Tiny
ANDRIN ATEM
  • MEMBER
  • 250 POSTS
Please advise on the colors, the red is hot water blue is coolant, brown and the other colors, could you help me with the color meaning, from that I can retrace my steps.
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Sunday, March 3rd, 2024 AT 12:37 PM
Tiny
ANDRIN ATEM
  • MEMBER
  • 250 POSTS
From this diagram, does water go through the air intake manifold?
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Sunday, March 3rd, 2024 AT 12:37 PM
Tiny
ANDRIN ATEM
  • MEMBER
  • 250 POSTS
These four points I marked with red, does water go through them or air? Because I manually filled them with water hoping to bleed air out of the system.
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Sunday, March 3rd, 2024 AT 12:42 PM
Tiny
ANDRIN ATEM
  • MEMBER
  • 250 POSTS
From this diagram I can clearly see I am dealing with a blown head gasket. Because I noticed water leaking out from the spark plug holes on bank two after car idled for about 10 minutes, I shut off the engine and took out the plugs on cylinder 4, 5 and realized coolant coming out. The diagram explains why and how coolant could come out. Please advise me if I am wrong. Also, oil mixes with water.
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Sunday, March 3rd, 2024 AT 4:07 PM
Tiny
ANDRIN ATEM
  • MEMBER
  • 250 POSTS
Please also help me with the diagram on replacing a head gasket and tuque specifications on tying bolds trimming. At this point I am looking at head gasket replacement.
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Sunday, March 3rd, 2024 AT 4:09 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,885 POSTS
Hi,

That isn't good news. Please note, this is a difficult procedure. It will require specialized tooling to retime the engine and camshafts.

Take your time and it is important to have the timing correct before turning the engine.

Take a look at the directions below. The directions are set up for removal of the cylinder heads and then install. The last two pics are the tightening sequence and torque specifications.

Let me know if this helps.

Take care,

Joe

See pics below.
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Sunday, March 3rd, 2024 AT 9:04 PM
Tiny
ANDRIN ATEM
  • MEMBER
  • 250 POSTS
Thank you.
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Sunday, March 3rd, 2024 AT 10:25 PM
Tiny
ANDRIN ATEM
  • MEMBER
  • 250 POSTS
Does this manual apply for a 2015 AudiQ7 supercharged? Thank you.
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Monday, March 4th, 2024 AT 12:01 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,885 POSTS
Hi,

No. I looked at the heading where you indicated a 2017 A7. However, they will be similar. Sorry about that.

I attached the directions below based on the VIN. When you are putting things together, make sure to lubricate the coolant pipe o-rings with either coolant or a thin coating of oil. That will help prevent damage to them.

I hope this helps.

Joe

See pics below.
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Monday, March 4th, 2024 AT 7:03 PM

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