Need engine advice N A 598 cubic inch rebuild
01-02-2015, 05:06 PM
#132
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I am definitely not an expert at failure analysis. But, looking at the pictures you posted, I noticed the area between the cylinders on the head. With the head bolted on, gasket in place, I cannot see how physically, the broken material from the valve, causing the area between the cylinder, to get damaged like it is. To me, it almost looks like that area got torched between the cylinders, probably led to the misfire you felt, introduced some water from the head gasket being melted, and thermal shocked the valve causing it to let go? Some of the fire ring/aluminum sent to the adjacent cylinder, causing the hammering marks to the quench pad?
Just throwing that out there. Its always easy to say a part failed, but I try to look deeper, so it doesnt happen again. Maybe some of the more experianced builders will weigh in on that.
Just throwing that out there. Its always easy to say a part failed, but I try to look deeper, so it doesnt happen again. Maybe some of the more experianced builders will weigh in on that.
01-02-2015, 05:10 PM
#133
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I am definitely not an expert at failure analysis. But, looking at the pictures you posted, I noticed the area between the cylinders on the head. With the head bolted on, gasket in place, I cannot see how physically, the broken material from the valve, causing the area between the cylinder, to get damaged like it is. To me, it almost looks like that area got torched between the cylinders, probably led to the misfire you felt, introduced some water from the head gasket being melted, and thermal shocked the valve causing it to let go? Some of the fire ring/aluminum sent to the adjacent cylinder, causing the hammering marks to the quench pad?
Just throwing that out there. Its always easy to say a part failed, but I try to look deeper, so it doesnt happen again. Maybe some of the more experianced builders will weigh in on that.
Just throwing that out there. Its always easy to say a part failed, but I try to look deeper, so it doesnt happen again. Maybe some of the more experianced builders will weigh in on that.
01-02-2015, 05:19 PM
#134
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[ATTACH=CONFIG]535121[/ATTACH]
01-02-2015, 05:25 PM
#135
PF Marine
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I am definitely not an expert at failure analysis. But, looking at the pictures you posted, I noticed the area between the cylinders on the head. With the head bolted on, gasket in place, I cannot see how physically, the broken material from the valve, causing the area between the cylinder, to get damaged like it is. To me, it almost looks like that area got torched between the cylinders, probably led to the misfire you felt, introduced some water from the head gasket being melted, and thermal shocked the valve causing it to let go? Some of the fire ring/aluminum sent to the adjacent cylinder, causing the hammering marks to the quench pad?
Just throwing that out there. Its always easy to say a part failed, but I try to look deeper, so it doesnt happen again. Maybe some of the more experianced builders will weigh in on that.
Just throwing that out there. Its always easy to say a part failed, but I try to look deeper, so it doesnt happen again. Maybe some of the more experianced builders will weigh in on that.
The heads that I've seen get torched normally have smoothed rounded edges (generic pic posted from google search), whereas this looks like it chunked out with the square/sharp corners.
01-02-2015, 06:03 PM
#137
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I am definitely not an expert at failure analysis. But, looking at the pictures you posted, I noticed the area between the cylinders on the head. With the head bolted on, gasket in place, I cannot see how physically, the broken material from the valve, causing the area between the cylinder, to get damaged like it is. To me, it almost looks like that area got torched between the cylinders, probably led to the misfire you felt, introduced some water from the head gasket being melted, and thermal shocked the valve causing it to let go? Some of the fire ring/aluminum sent to the adjacent cylinder, causing the hammering marks to the quench pad?
Just throwing that out there. Its always easy to say a part failed, but I try to look deeper, so it doesnt happen again. Maybe some of the more experianced builders will weigh in on that.
Just throwing that out there. Its always easy to say a part failed, but I try to look deeper, so it doesnt happen again. Maybe some of the more experianced builders will weigh in on that.
A couple of local engine builders thought it lifted the head. The gasket had the exact same impression but was not burnt out.
The head came off easily.
01-02-2015, 09:01 PM
#138
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It looks to me in the pictures that there is carbon in the markings in the quench pad. I don't think that's from the valve in the other cylinder. Does anyone notice all the speckling to the quench pads on the other cylinders? Mayor do you have any pictures of the old piston tops or spark plugs? Did anyone happen to measure the ring lands on the old Pistons to see if the rings were shaking?
