Originally Posted by
BRAMMER
I've just got some flush to see if that can help cure it but if not then the head will have to come off and sent for a complete clean - would prefer not too. I just need to know where the blockage is and why it blocked.
It's the whole of the outlet side so it must be further down than oil ways at the top off the head.
Could do with knowing the design of the galleries to identify where it splits into the individual channels
the yb heads have little grub screws in them to gain access to the oilway
try opening them and blowing them out a little with a compressor ,,may help without having to remove the whole lot
would personally take the cam out and the lifters before doing this though !!
grub screws are located on the front of head behind cam pulleys @ the corner of head
also on the side of the head @ the front corner of the head (will need to remove inlet manifold to do the inlet side)
there are also two on the rear but doubt you will be able to remove easily in situ
may be worth a try pal