Hood Cracked from Fatigue - Page 4 - Ford Powerstroke Diesel Forum
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post #31 of 42 Old 06-13-2019, 06:25 AM
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Missing information

I see a number of comments from people but has anyone asked if there is a wind deflector attached to the hood? Or have the hood stop heights too low? I've never seen this on a ford but on another vehicle, the hood was warping. The stops were too low forcing the owner to slam the hood to close it. I could go on, but I think you get the ideal.
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post #32 of 42 Old 06-13-2019, 07:22 AM
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This definitely does not appear to be stress cracking, spider cracking or not. The location is wrong for that.

I have a degree in Mechanical Engineering with materials specialty. I've done plenty of structural engineering (nuclear field) and plenty of FEA. I'm not even going to pretend I'm an expert by just looking at the pic of that hood. But there's more to it than the pic....
Just sayin'.....

@HeavyAssault Well Said!
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post #33 of 42 Old 06-13-2019, 07:33 AM
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looks like a fat chick fell off a flatbed wrecker and onto the hood.
lucky the axle didn't snap
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post #34 of 42 Old 06-13-2019, 05:10 PM
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I would have expected a bigger dent.
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post #35 of 42 Old 06-14-2019, 12:42 PM
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Hi, I have over 50 yrs in the aluminum industry. This does not look like fatigue. This looks like a mfg problem or the hood was damaged and repaired. A met evaluation will tell you what the problem is but be prepared to shell out some money. I would...

1. Check the trucks history for accidents and repairs.
2. Just buy a new hood section, paint it and diy repair.
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post #36 of 42 Old 06-14-2019, 03:12 PM
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Quote:
Originally Posted by CloverLeafFarm View Post
looks like a fat chick fell off a flatbed wrecker and onto the hood.
lucky the axle didn't snap
your experience speaks volumes

thanks for taking the guesswork out of this

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post #37 of 42 Old 06-15-2019, 04:46 AM
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saw it at schieds
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post #38 of 42 Old 06-15-2019, 08:38 AM
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that is believable even if it is a cover story LOL



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post #39 of 42 Old 06-15-2019, 09:38 AM
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Quote:
Originally Posted by Sollly View Post
It is definitely from driving down the road. I have a degree in Aerospace Engineering with a lot of knowledge on Fatigue cracking. The spider pattern is a indicator. As I said the outside of the hood is perfect. I have an identical XLT right next to it and the hood profiles are exact on outside.
You can hold the center of the hood and flex each side up and down just as the hoods do in high winds and and it flexes and pops right at the cracks. It appears the inner layer and outer layer are also de-laminated. I assume they were held together with adhesive at one point.
I’ll have to disagree on fatigue cracking. Looks more like freq vibration. Impossible to tell if it’s low, mid, or high without mounting an accelerometer. If you have an aerospace degree, it wouldn’t be hard to convert the hz to rpms, then determine which component spins at said rpm. Or—————-
Check your motor mounts, trans mount, and stop drill the cracks to prevent them from spreading. Any vibration from power plant will have to run through the mounts. My parents still have a 94 Cummins dually they bought new. Same scenario with that. Fuel tank straps kept cracking, bed, fenders, and hood. Basically everything except the cab.
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post #40 of 42 Old 06-15-2019, 11:16 AM
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Quote:
Originally Posted by Jjorgis5569 View Post
I’ll have to disagree on fatigue cracking. Looks more like freq vibration. Impossible to tell if it’s low, mid, or high without mounting an accelerometer. If you have an aerospace degree, it wouldn’t be hard to convert the hz to rpms, then determine which component spins at said rpm. Or—————-
Check your motor mounts, trans mount, and stop drill the cracks to prevent them from spreading. Any vibration from power plant will have to run through the mounts. My parents still have a 94 Cummins dually they bought new. Same scenario with that. Fuel tank straps kept cracking, bed, fenders, and hood. Basically everything except the cab.
Yeah but everything cracking on a Ram is normal. Good engine in a junk truck.
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