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Davide

E34 206s2 and e36 206s2 compatibility

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Hello everyone I'm new to the forum in starting this thread because i cannot find anywhere this information.

I need to replace an e34 520i (1995 late model automatic) engine with a code 206s2.

 

I like to put the engine with the same code but somewhat that are rarely from an e34 and more often from a e36.

 

Is a direct compatibility between e36 and e34 ?(same code 206s2, without harness, just the engine)

 

Also, what's the difference between a 206s1 and 206s2 engine, are they compatible? (For what I could understand they are vanos engine and non vanos)

 

I hope you can help me out our point me to some info that it's already available also about engine replacement in general.

 

Here one pic of my car

Thank you in advance from Italy!

20210430_102916.jpg

Edited by Davide

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Hi, the code is the engine version stamped on the engine under the engine number.

20 is 2,0 liters, s1 non vanos , s2 vanos as far as I've understood for the m50b20.

 

Pic of the code (not mine) in attachment cheers

 

Screenshot_20210504-095652_OneDrive.jpg

Edited by Davide

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By further research I've understood that e34 and e36 m50b20 in my case 206s2, if they have same code they have direct compatibility (plugs are the same etc) except the oil pan that has to be swapped from the old engine.

 

Could someone confirm this before i make the purchase of the engine? Thank you again!

D.

 

 

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Why not fit the m50b25. It almost no extra work. E36 engine are the same. Mounting points can be adopted if different

 

Engines can be rebuilt also. You m50 would have to be really screwed to be beyond rebuilding. Another engine of unknown history may turn out to be a turnip. Personally of the block is sound i would have it rebuilt. What is the problem. If its cylinder head related just replace that. 

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12 hours ago, Davide said:

By further research I've understood that e34 and e36 m50b20 in my case 206s2, if they have same code they have direct compatibility (plugs are the same etc) except the oil pan that has to be swapped from the old engine.

 

Could someone confirm this before i make the purchase of the engine? Thank you again!

D.

 

 

 

If you have to swap the oil pan/sump I would strongly suggest you compare the part numbers for the oil pump, oil pump chain, sump pick up pipe etc - the oil pan/ sump won't be the sole difference.

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2 hours ago, bm0p700f said:

Why not fit the m50b25. It almost no extra work. E36 engine are the same. Mounting points can be adopted if different

 

Engines can be rebuilt also. You m50 would have to be really screwed to be beyond rebuilding. Another engine of unknown history may turn out to be a turnip. Personally of the block is sound i would have it rebuilt. What is the problem. If its cylinder head related just replace that. 

I'd love to put the m50b25 but in Italy is illegal. In case of an inspection after an accident, the insurance can threaten not to pay. On a Vespa is one thing but on cars are more strict.

 

The engine has 360k km, nobody wants to fix the head gasket and give me some kind of guarantees. They say it may bring other problems and feel it's better to change the engine. Changing the engine apparently it's also cheaper than replacing the head gasket and mill the head over here.

 

But I agree with you, personally I've would have it rebuilded, but I cannot find anyone in the area where I live.

 

About the oil pan swap between e36 and e34 someone had direct experiences?

Here I've heard about a simple change from more than one person.

 

Thanks!

 

 

 

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No one gives guarantees on a head gasket replacement. Standard practice is remove the head, pressure test it skim to ensure it flat and refit it with a new gasket and cylinder head bolts. The bolt holes on the block will  have to be cleaned out to ensure the block does not crack. 

 

Garages may not do this work. Often it gets sent to a specialist. Replacing a tired engine with another old and possibly tired engine is a possible cab of worms. Old engines need to be rebuilt and if thats done well it then a new engine. I have learnt the hard way do a job right and its done for good. Do it cheap and you get to do it again. 

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Ok thank you to everyone.

I've found an e34 engine from an identical car that was rearended and apparently it is in very good condition. I'll let you know how the story evolves.

Ciao

 

 

 

 

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