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Good Morning All

Have recently inherited a non running 116D with N4720DC engine that initially thought timing chain had failed

After removing and dismantling found the chain/guides were in good order but when the head was removed the problem presented itself

One of the piston crowns had melted and part of a valve had become fused creating a molten sculpture 

Further inspection revealed that the respective liner had escaped any damage and was again in great order

Can the wider audience highlight if this is an anomaly or another one of the idiosyncrasies of the series?

Additionally the cylinder head was damaged and rendered u/s that will require replacing

It is a 79768 08 but could it be replaced with an 07 or are the heads non interchangeable 

These are the images of the findings 

Hope to hear from the group in due course

Kind Regards 










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Morning Terry

Welcome to the Forum

Wow that made a mess, I have seen similar damage on a 2.0d Peugeot engine (friend of our sons) a piece of glow plug broke off when he changed them, He said he didn't notice? I think the broken bit got wedged in the exhaust vale the result looked similar to yours.

If you aren't aware take a look at www.realoem.com It is an online BMW Parts List put the last 7 digits of your Vin into the search box it will bring up your model. Then search the section you need. Once you have the section up double click the part number you want and you will get a list showing alternate part numbers and models it was used in.

You look like you know what your about with a spanner just make sure new head bolts are used. I would also check water pump and change the timing chain and guides as your that far in.

Good job so far 


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Morning Dave

Many thanks for the information will browse the site later today and see the data available 

Thanks for the advice regarding change out items - will compile the shopping list and crack on with the rebuild 

No doubt will be posting again throughout the journey and hopefully you may be kind enough to help with any questions that will pop up

Appreciate your assistance now and in advance 

Kind Regards 






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