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08-05-2019 | 10:14 PM

#21

Tinkerer

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Joined: Jan 2002

Posts: 4,612

Likes: 7

From: ALTO, MI

My point is that it wasn't a chunk.
It was vapor. The combustion gasses turned it into aluminum vapor.

08-05-2019 | 10:55 PM

#22

SABER28

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Joined: Aug 2002

Posts: 1,256

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From: jenison mi

Quote:

Originally Posted by Tinkerer

My point is that it wasn't a chunk.
It was vapor. The combustion gasses turned it into aluminum vapor.

i get aluminum with its lower melting temp. but this was a cast iron head, right? looks like iron to me.

08-05-2019 | 11:33 PM

#23

RBeyer

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Joined: Nov 2003

Posts: 825

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From: Antioch, IL

Quote:

Originally Posted by SABER28

i get aluminum with its lower melting temp. but this was a cast iron head, right? looks like iron to me.

It is a cast head!

08-06-2019 | 09:08 PM

#24

Rookie

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Joined: Jan 2003

Posts: 6,018

Likes: 1,521

From: Grand Rapids, MI

It's a common failure when a head gasket goes on an iron head. Take it to the machine shop and have them weld it with a high nickel rod. They have probably done 100 of them.

08-07-2019 | 12:27 AM

#25

Griff

Charter Member # 55

Joined: Oct 2000

Posts: 20,241

Likes: 2,490

From: Omaha/LOTO

Quote:

Originally Posted by RBeyer

If the gasket failed hypothetically shouldn't it have been very obvious from that point that there was a problem. It's a Hawk 525 SC and it sounded perfect and actually made a bit more power than the other motor, I posted because I don't have all the answers.

I'd say it was making more rpms because it was running leaner than the other engine. Not sure exactly why it was leaning out, but I would look into possible causes.