Cylinder head waterway corrosion

[gordon]

Hi all, 1965 230 sl going through a complete rebuild. I have removed the cylinder head and i found that 1 of the large inserts in the waterways on the exhaust side is missing, another is loose [which i have removed together with 4 small ones on the other side also affected by corrosion and almost closed up.]

Because the corrosion to each of the holes has removed the little dimple which locates the new ali inserts the correct way round i wonder if anyone has a picture of a non corroded head so that the weld repair will locate them correctly. Thankyou,Gordon

[Benz Dr.]

Generally speaking, I believe the ports on the water inserts should point towards the valve seat areas deep inside the head.

[gordon]

Thankyou Benz Dr,   do the new inserts come with the distorted top edge or is this formed by knocking the edge of the new inserts into a preformed recess?  Thankyou, Gordon

[Benz Dr.]

I think they have that small notch built into the top rim.

[gordon]

So i just need to establish which direction the holes in the inserts face.[some have 1 hole in them and some with 2]  Machine shop checked the weights of the new Mercedes pistons prior to balancing the crank and found almost 7 grams difference between heaviest and lightest