Thumping noise after head gasket and stud install - Ford Powerstroke Diesel Forum
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Old 07-07-2014, 04:32 PM Rookie

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Thumping noise after head gasket and stud install

Ok, so I tore down my 04 to put gaskets and studs in it. After putting everything back together I had a heck of a time getting it started. After I cranked for a while it started making a noise like air blowing through (kind of like not having a spark plug in). After I finally got it going it started making a bigger banging noise.

Now after reading up a little bit I found out that you're supposed to put the dowel mark on the crank to 6 oclock. I didn't do that. The noise really sounds like it's coming from the front of the drivers side. From everything i've read online it usually takes out the push rods and rockers but on #5 cyl which is the other side of the motor.

I took the valve cover off the drivers side (where the noise sounds like it's coming from) and everything up top looks good.

So do I take the other side apart and check out the push rods and rockers on that side or assume it bent a valve or something? I've yet to read where it bent a valve on someones engine.

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Old 07-14-2014, 02:54 PM
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If you have a thumping noise coming back through the intake it's because a valve isn't closing. If some debris was dislodged during the disassembly/assembly and ended up under a valve keeping it from closing when the piston came to top dead center, it could have bent a valve.
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