engine ID help

[kasbatts]

Hi all

Can I have some help please

I have purchased a 3.5 for the old girl and are about to get under way with the rebuild, but I'm getting a bit confused as to what i've got.

The block has 3.5 cast onto the side, and I think i'm right in saying that it is a 3 November 85.
There is a casting on the block "3 K 85" , and the head also has 85 in a circle on it??

My question is, is this a M30b35 or a M30b34, and what are the differances between the two??
As I'm in New Zealand the engine spec is going to be the same as Europe as thats what we got here.

And last question, what would this engine have been? Motronic, Ltronic???
There is no dissy drive and the top section of the front cover is missing so I'm a bit cluless here

If its any help the front pulley has the large diameter ring at the back of it near the block and there is a bracket for some sort of crank trigger, I have read somewere on the forum that the M30b35 has this and the M30b34 has this set up on the flywheel, is this correct??


Thanks for your help in advance


Steve

 

[sfdon]

A few thoughts for you...

There were no L or K or D JetTronic anything left as of 1985- everything was Motronic.

The M30 b34 engine was produced until 1986

http://www.realoem.com/bmw/select.d...=Lim&model=735i&zone=ECE&prod=19860600&arch=1

The M30 b35 engine began its production run in Europe in 1985 -

http://www.realoem.com/bmw/select.d...=Lim&model=735i&zone=ECE&prod=19851000&arch=1

You need to locate the flat boss above the starter and input the 7 digits you see there into the serial number search box at this site for info on your engine:

http://www.realoem.com/bmw/select.do

Let us know what you have for those 7 numbers!

 

[sfdon]

BTW- if you just want the quick and dirty method-

Look at the passenger side of the block at the rear. You will see a rubber stopper that allows access to the flex plate if the engine is a M30 b35.

 

[kasbatts]

Call me dumb but I cant get my numbers to bring up anything

Numbers above starter are 427 83760 and under this number is 34 6E B

 

[Bert-Ola]

Call me dumb but I cant get my numbers to bring up anything

Numbers above starter are 427 83760 and under this number is 34 6E B

34 6E B
34 = Hubraumangabe (3430 cc)
6 = Anzahl der Zylinder (six cylinder)
E = Motorkonzept - Einspritzung (injection)
B = Unterscheidungsindex (Internal BMW information - change index)

4 278 3 760
4 = Assembly line (4 or 5 = M30)
278 = Serial number
3 = Factory code (0-4 = Munich)
760 = Production day ( I don't know how to interpret this)

 

[kasbatts]

Thanks for that Bert, so am I right in saying it is a M30b34?