Oil in head bolt holes - PowerStrokeNation : Ford Powerstroke Diesel Forum
 
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post #1 of 5 (permalink) Old 04-14-2015, 10:13 PM Thread Starter
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Oil in head bolt holes

I know about the importance of making sure there is no oil in the bolt holes when putting studs in. When I did it before there was zero oil in any of them. I just took one of my heads off (number two tomorrow hopefully) and three of the studs came out soaked in oil. Looking at things, I can't figure out where the oil would be coming from. Could it really be making its way past the washer and nut from way up top or is there something else I'm missing?
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post #2 of 5 (permalink) Old 04-14-2015, 10:39 PM
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Re: Oil in head bolt holes

Yes it could or could have gotten oil on it upon removal. The reason you don't want oil in the holes on installation is because when you go to torque them you will get a false torque due to oil is not compressible and acts like the bolt is bottomed out but it really is not. Then when the oil finally works it's way out of the bolt hole you have a loose bolt/stud etc.

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post #3 of 5 (permalink) Old 04-15-2015, 11:14 AM
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Re: Oil in head bolt holes

I'd guess removal. Compound that hunch if you used any kind of penetrating oil. Does it look like dirty engine oil or more clean like PB or WD? Also, is it thick and gooey or real light? Engine oil caught in a tight spot like a head channel won't be moving around much, instead sitting there cooking over and over so it's gonna be thick and tarry. An unscientific way to further investigate this is to roll the threads of the stud/bolt against the pads of your fingers and see what stays behind.

Absolute worst case and pretty unlikely (but those are the ones that end up being reality) is that on your first reassembly you overtorqued things and cracked the head on those specific fasteners... But hopefully not
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post #4 of 5 (permalink) Old 04-16-2015, 03:20 AM Thread Starter
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Re: Oil in head bolt holes

Didn't use any break-free or anything like that. Just muscled em off....which, btw, was almost as hard as putting em on! lol Anyway, didn't over-torque em. Used a calibrated torque wrench. Did it in three stages up to 210 ft-lbs per the instructions. The oil does look old and nasty. Much different in color than the rest of the oil, so it must have just gotten in there gradually somehow. Not unheard of, but still odd.
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post #5 of 5 (permalink) Old 04-16-2015, 10:26 PM Thread Starter
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Re: Oil in head bolt holes

Well, I think I just figured it out. I was looking at the old head gaskets and the oil return holes are in the same "sealed in" area as the bolt holes. Makes sense that if the head gasket isn't sealing 100% (which mine weren't) that oil could easily migrate its way to the bolt holes.
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