I just had to completely rebuild my A14 again because no 4 Big end oil gallary blocked and stopped oil getting to the rod.

Im not that technical but ill explain to the best of my ability what was wrong with my car.

My father is a mechanic so after closer examination why only no.4 big end bearing clogged and not any others, dad found that there is a oil line (or something like that) iside the crank that goes from the mains to the big ends and that was clogged full of stuff in there.

now that i have cleaned that out we know its all working and car is running like a dream.
This is also after replacing all the bearings, big ends and mains, new timing chain, fixed the conrod and shaved the crank. oh while i did all that i took my cam shaft down to the shop and had it ground out to 35/70 (sounds pretty lumpy now)

Before we had cleaned this out, i had done my big ends twice in the past 4 months because the big end bearings went.