Hey HT,

I bought a project hatch and ive been tearing down the d16z6 engine and i finally have it apart. I have it down to the bare block and I see these cracks. I'm not sure if they are cosmetic or structural.

This is my first time so i have no experience to be able to make any judgement. The symptoms of the engine before the tear down was spun rod bearing on cylinder #4, water in oil and over heating. When i removed the head the gasket seemed fine but maybe just a bad seal.

Unless these micro cracks are letting water into the block. The cracks dont propagate into the sleeves. This is underneath where the crank and oil pan are. Any help would be great if i either scrap the block or give it a shot and see what happens.

 

Looks normal?

 

Normal , just the way the casting are shaped .

 

Looks like normal casting lines to me.

 

Yep. Just casting lines. The aluminum is a liquid when they cast it so imperfections like that are bound to occur