A6 / S6 (C6 Platform) Discussion Discussion forum for the C6 Audi A6 produced from 2004-present and Audi S6 produced from 2007 - 2011

3.2 Engine. Is it interchangeable?

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Old Aug 13, 2020 | 11:38 AM
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Default 3.2 Engine. Is it interchangeable?

Hi guys,

I have 2006 Audi A6 with 3.2 engine. Engine got hydrolocked, i guess. I got it towed and left in my driveway for a month. Now to be honest I want to get it running. Gonna visit few junk yards to source engine, so my questions is: what other models and years share the same engine with my car or it has to be exact same year and model?
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Old Aug 13, 2020 | 09:31 PM
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What do you mean the engine got hydrolocked? What happened? Another engine from the same model year would be ideal.
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Old Aug 14, 2020 | 06:27 AM
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Originally Posted by kelisko
What do you mean the engine got hydrolocked? What happened? Another engine from the same model year would be ideal.
It was driven through water and engine locked. Yeah, i know that same year and model is the best options, its just i was told that A4 3.2 engine of same year should fit. Also i heard that C5 3.2 is compatible as well.
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Old Aug 14, 2020 | 06:54 AM
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Originally Posted by Noud
It was driven through water and engine locked. Yeah, i know that same year and model is the best options, its just i was told that A4 3.2 engine of same year should fit. Also i heard that C5 3.2 is compatible as well.
lol, c5 3.2 doesnt exist.

check ur engine code, and look for same engine code, year is irrelevant.

u might need to change ECU as well.
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Old Aug 14, 2020 | 07:27 AM
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He probably meant A5 3.2.

The engines in the A4 and the A5 are basically the same as in the A6 but the setup is different. I would not go that route.

Swapping the engine is a big deal. Don't you want to try fixing the one you have first? How deep was it in the water? Do you think water entered the intakes? This car air intake ducts are positioned high enough and the air filter box is designed to avoid water intake as much as possible.

Did you proceed to any troubleshooting before concluding the engine got hydrolocked?
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Old Aug 14, 2020 | 01:11 PM
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Originally Posted by kelisko
He probably meant A5 3.2.

The engines in the A4 and the A5 are basically the same as in the A6 but the setup is different. I would not go that route.

Swapping the engine is a big deal. Don't you want to try fixing the one you have first? How deep was it in the water? Do you think water entered the intakes? This car air intake ducts are positioned high enough and the air filter box is designed to avoid water intake as much as possible.

Did you proceed to any troubleshooting before concluding the engine got hydrolocked?
I always worked with my Benz engines and this car is my first "non Mercedes" so I am going with what I was told. I asked a bit around and was told that if car was flooded and stalled and now doesn't want to turn (especially with Audi) engine is dead and no reason even to dig into repair and used engine is only way. I am actually willing to dig into rebuild more than engine swap. And to be honest I did not do anything on it yet and went straight to find an engine. And to be honest, I saw c6 engine out on the pallet and the way it looked, I can tell that its aint easy and seems very complicated.

If you know anything to look into that might help me troubleshoot it, I will appreciate it. My idea was to drop the oil pan and look inside and check rods, but not sure if in Audi they are visible from the bottom.

Also I had couple minutes with it and my first thought was to find the crankshaft bolt and try to turn the engine manually, but I blindly was trying to find it on pulley and did not feel anything, it felt like harmonic balancer was held by some kind of bracket.


PS. Bought this car non-op from my neighbor, and thats the only story I got. He was driving through flooded street when water got high to mid door. Car stalled and got towed. Thats it.
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Old Aug 14, 2020 | 01:51 PM
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This is mid-door.



Air intake ports are higher. The front intake is at the upper nose of the single frame grille and the duct bends upwards towards the air filter box. It is possible water did not enter the engine. I can't guarantee it but you can hope it did not happen.

Where to start? I'd say electricity. It is very likely many fuses and relays are blown. What is the state of the battery? Does the car respond to electricity at all?

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Old Aug 15, 2020 | 09:49 AM
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I’d start by removing all the spark plugs and try to turn the engine over by hand. Just grab a serp belt and try to turn it over.
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Old Oct 2, 2020 | 10:38 PM
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Sorry, had to wait with A6.

Checked all fuses, they seem okay. Electronics, MMI and all switches work.

Bought special crankshaft turning tool and engine is dead locked, not even budging.

Got curious and removed engine with transmission (could not get into last bolts inside tranny since engine does not turn, so had to remove with tranny attached). Oh God, I regret doing it, it took me whole week and I would never do it again.

Now I have questions.

İ started to suspect that going through water was just coincident to engine locking up and issue might be with timing belts skipping.

What would you guys suggest?

1. Take heads off and look inside?
2. Take oil pan off and look inside?
3. Take two bolted black covers on the back of engine and look inside?
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Old Oct 5, 2020 | 08:43 AM
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Originally Posted by Noud
Sorry, had to wait with A6.

Checked all fuses, they seem okay. Electronics, MMI and all switches work.

Bought special crankshaft turning tool and engine is dead locked, not even budging.

Got curious and removed engine with transmission (could not get into last bolts inside tranny since engine does not turn, so had to remove with tranny attached). Oh God, I regret doing it, it took me whole week and I would never do it again.

Now I have questions.

İ started to suspect that going through water was just coincident to engine locking up and issue might be with timing belts skipping.

What would you guys suggest?

1. Take heads off and look inside?
2. Take oil pan off and look inside?
3. Take two bolted black covers on the back of engine and look inside?
When you tried turning over the engine by hand did you have the plugs out as Sallad suggested? If not then it doesn't really count because you may have a cylinder full of fluid in its compression stroke and that would certainly stop you from being able to turn it. There is also a possibility that if water got into several cylinders and just sat there for a period of time that the rings just rusted to the cylinder walls and the application of some penetrating oil in through the spark plug holes should get them moving again. Then the next step, if all this fails, would be to remove the pan and see if you can identify a bent con-rod or two. I think for the heads to have been affected would require that the timings chains had slipped.
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