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Old 03-20-2015, 09:09 PM   #1
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Default What caused this?

While pressure washing my block before assembly I noticed a chunk of metal missing next to cylinder 4 on the bottom.
My mechanic friend says someone must have dropped something heavy. I am thinking that area was weakened by detonation and with the water pressure it got knocked out.
Anyone else expereinced anything like this?
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Old 03-20-2015, 09:17 PM   #2
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That is normal, that is how the cast is made.
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Old 03-20-2015, 09:48 PM   #3
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Originally Posted by Baker99miata View Post
That is normal, that is how the cast is made.
I don't think that big hole is normal.
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Old 03-20-2015, 10:26 PM   #4
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mazda caused that.

I said the same thing to myself the first time I was in a BP
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Old 03-22-2015, 02:35 AM   #5
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That's where the oil drains back to the pan from the head. it is made that way.
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Old 03-22-2015, 03:38 AM   #6
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Quote:
Originally Posted by orlmiata View Post
While pressure washing my block before assembly I noticed a chunk of metal missing next to cylinder 4 on the bottom.
My mechanic friend says someone must have dropped something heavy. I am thinking that area was weakened by detonation and with the water pressure it got knocked out.
That area is not exposed to detonation or water pressure. It's the oil drain for the cylinder head. 100% normal.
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Old 03-22-2015, 07:59 AM   #7
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1) Totally normal
2) Find a new mechanic
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