Sound coming from airbox.

Delta.Speed

Member
Mar 26, 2022
49
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Well here goes fixing my last leak. I knew it was gonna be one of the damn gaskets shifting on me. Posting this in case it can help someone in the future.

Red circle is residual oil on the drain pipe that tells me the leak is coming from the top gasket and not the lower, and the arrow is pointing to the gasket that's completely out of place.

Image quality sucks cause im taking pictures of the camera screen.
6ed5a91592decde0c29d47d6434c190d.jpg
7d9ff0b9f2e46c4e8d34ef59a6a06ff9.jpg


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Delta.Speed

Member
Mar 26, 2022
49
5
8
Well good news and bad news... good news is that I dont have a motor with low compression on all cylinders...

The bad news is that I have a motor with 400-410 psi of compression on all cylinders except for number 7 that has 300.....

How bad am I screwed? Am I in bent valve or cracked piston territory??



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2004LB7

Well-known member
Dec 15, 2010
4,237
500
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Norcal
lifting injector may cause a loss of compression too. could also be a bentor hung valve causing the compression coming back out the intake lowing compression. id check the easy stuff first by pulling the valve covers before assuming the worst.

since you don't have much blow by I'd guess that you don't have a cracked piston
 

Delta.Speed

Member
Mar 26, 2022
49
5
8
Well, I believe I have reached the end of the hope road here. I now have blow by that wasn't there before tear down, and was not there when I first fired up the truck. I started the truck back up after fixing the oil drain line leak and after about 2 minutes of running it started blowing smoke out the PCV outlet by the oil pan, popped open the oil cap and this is what I got.


Now I would just like to know how.... anyone ever seen something like this before?



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Delta.Speed

Member
Mar 26, 2022
49
5
8
Oof, that sure does look like a cracked piston. That really sucks man, sorry to see it.

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Thats what I figured, but what I dont get is how does an engine just develop a cracked piston while idling??

I went back and found the blow by test from when I first bought the truck and it 100% did not have that. And all I've done since I did the top end is idle it, and when it first fired up it wasnt doing this. So my question is, how did this develop? Never seen anything like it.

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Bdsankey

Vendor
Vendor/Sponsor
Feb 1, 2018
3,069
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Neenah, Wisconsin
Ooooffff, that sure looks like cracked piston blow-by to me. How it developed it at idle is certainly an unknown. It wasn't doing it on your first test drive was it? How hard did you get on it during the test drive?
 
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Delta.Speed

Member
Mar 26, 2022
49
5
8
Ooooffff, that sure looks like cracked piston blow-by to me. How it developed it at idle is certainly an unknown. It wasn't doing it on your first test drive was it? How hard did you get on it during the test drive?
Not hard at all. I'm not one to finish installing new parts and dog it without allowing some settling time first. I just cruised around the block and came right back in cause I noticed the oil leak from the drain line. Didn't even do more than like 45 mph.

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Delta.Speed

Member
Mar 26, 2022
49
5
8
Time to take the heads back off. Start with #7 side.
Yeah I figured. Whatever is in there is gonna absolutely suck. So before I go do that I'm gonna take a break from this truck and finish my two Jeep projects. Gonna probably sell those to recoup some coin to help out with the crap show in #7.

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