I have a crack around one of the sump bolt holes on my engine block on my C20LET engine. I used a 8v sump gasket as it made the job a lot easier but didnít take into consideration about using shorter sump bolts. So doing the original 16v sump bolts up one at a time, the last one, up to torque and then Ďsnapí.
Thought at first the thread had gone but in fact a small segment of the cast iron block has cracked and it broke out towards the flywheel. It has not gone into the sump area. So no oil can get out of there, but because the bolt hole is only half there, I canít do the bolt up 100% so itís not tight enough. Hence oil is slowing dripping out.
I wonder if anyone has repaired a cast iron block before? Iíve tried liquid metal and a helicoil, which seemed to do the job at first, but the segment, broke away eventually. Can you weld cast iron? Or can you braze it?
See pic below, its not very clear (focus not very good) but you can make out, near the 5 end cap, the sump bolt hole and the 2 hair line cracks that grow from out of it.
Hereís a close up view.
And hereís me inserting a helicoil in, but didnít work