Will a 525i European head fit my 1973 built 3.0 CSi

[Barry.b]

Hi guys
I am looking for some help and advice please.
I need to purchase a new cylinder head for my 1973 built 3.0 CSI

I have spotted this one for sale.

Does anyone know if this part number will fit :
11129068833

It says it’s for a 525i
I think it’s a European engine part only.
It seems to have a few extra holes and I’m not sure if they are supposed to do anything or not. ( I put an arrow pointing to the holes )

Any advice would be great thanks.

I definitely don’t want to spend good money on it if it’s not correct.
Thanks
Barry

 

[Krzysztof]

Maybe it will help...

I thought in the past such topic should be in the FAQ section.

https://e9coupe.com/forum/threads/bmw-m30-m90-engine-heads-library.42458/#post-371777

 

[Barry.b]

Hi Krzysztof
Thanks for the link .
There is a lot of helpful info there for sure.
Sometimes it can take a long time to find out something
But we are really very fortunate to have such great people willing to help out . Over and over again.
Thanks again

 

[Ian C]

Cant say about the holes. but the cam may be different. Was your head cracked?

 

[Barry.b]

Hi Ian
I have the older style head from a 1980 casting on my 1973 engine
Unfortunately I am getting coolant in my oil sump.
So my problem is either a bad head gasket or a bad cylinder head gasket.
As I am in there changing/ checking the head gasket, maybe now is the time to put a better head on , the type with the smaller coolant holes in it.

 

[sfdon]

Valves are same... until m30b35 and then they are bigger.

 

[Ian C]

There is a good FAQ re heads on First Fives website. First result if you google "M30 cylinder head". It suggests the 525 head works with the correct gasket.

 

[Krzysztof]

It was shared some time but might be hard to find in the end.

Having it by the hand...

 

[Fritzie]

Hi guys
I am looking for some help and advice please.
I need to purchase a new cylinder head for my 1973 built 3.0 CSI

I have spotted this one for sale.

Does anyone know if this part number will fit :
11129068833

It says it’s for a 525i
I think it’s a European engine part only.
It seems to have a few extra holes and I’m not sure if they are supposed to do anything or not. ( I put an arrow pointing to the holes )

Any advice would be great thanks.

I definitely don’t want to spend good money on it if it’s not correct.
Thanks
Barry

Hello Barry, the head shouldn’t place on a flat table because it will rest on some opened valves. The valve's could bend !

 

[Barry.b]

Valves are same... until m30b35 and then they are bigger

I tested my engine block coolant jacket today by putting a flat rubber gasket on top of my block then I used an old cylinder head as my “ blind flange “
I then blocked the outlet from the water pump and put a pressure guage on it.
I connected my compressor up to the coolant connection on the side of the block, the one that supplies coolant to the auxiliary air valve on a CSi
I put in 2 bar pressure and then closed my air inlet valve from my compressor.
2 hours later there was no pressure drop showing on the pressure gauge.
So I know my block is good .

 

[Barry.b]

I then tried to test my cylinder head.
I am not 100% sure yet if my rubber gaskets are sealed correctly.
I might have to spend a bit more time on it.
I used 2 pieces of box iron and drilled them to take 6 cylinder head bolts
I then made 3 blind rubber gaskets to cover all the coolant ports on the head , 2 for the face that normally meets the engine block and 1 for the thermostat housing.
I then put compressed air into the head through the heater pipe at the back of the head.
I put in 1 bar
I can hear a leak but so far I cannot see where it is (it might be my rubber gaskets )
I might have to submerge the head in water or maybe spray it with soapy water.