Been assembling the engine in the 320/6 this weekend...but a problem arrived the original timing-belt won't fit The size is 1044x25mm 127z . It seems like the belt has to many teeth...the length is ok. Do you know of other belt-sizes for the M20? some photos :
I beleive there's two sets of timing belts, 127 and 128 teeth.
One has round teeth and the other square teeth, although im not 100% sure about that.
Maybe someone else can help you out.
ac/dennis is right there were two types of teeth styles on belt, you have the wrong one, no probs easy solution, find another engine which will have the right sprockts to fit your new belt!!
Indeed there are 2 timing belts. Last year the garage changed it on my 320/6 and they ordered the wrong one, and what while I knew that there are two diffirent styles. So... a common thing to have wrong.
Hi again! There are actually three different belt types! 127,128 and 110 teeth, my car had the 110 teeth belt. I've ordered it, so hopefully the engine will fire up soon
Maybe the production year and month of the engine will tell you more.
Differences between the nr of teeth is countable, but not when the belt is still on your car I guess.
Retrobeemer: If you have the 7 last digits of your chassis number i can look it up in ETK parts database, i have the program on my pc. Maybe it will show wich tybe of belt you have.
good work matey love the look of that engine block looks so fresh and clean!
the original timing-belt won't fit 
The size is 1044x25mm 127z . It seems like the belt has to many teeth...the length is ok. Do you know of other belt-sizes for the M20? some photos :
...think I'll bring the belt drives to my local bmw-dealer and try on the other belt.
