Air intake thump. - Ford Powerstroke Diesel Forum
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post #1 of 10 Old 08-18-2019, 05:21 PM Thread Starter
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Air intake thump.

Hey guys newbie here. I just had my 07 6.0 completely rebuilt. New main bearings new cam bearings with stage 2 colt cam. New connecting rods, pistons and rings. New pushrods, lifters and new high performance heads with studs. New Hpop with stc fitting. Literally brand new motor. Also have egr delete I got it all back together and started it and it ran great but noticed oil leak in front of motor so I **** it off replaced front seal and put back together. But now I have a thump in the air intake. I used scan tool and it’s showing FICM low voltage and exhaust puffs little white smoke. Any idea or help would be greatly appreciated. Thanks
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post #2 of 10 Old 08-18-2019, 06:51 PM
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Better pull the valve covers, crank the engine and see which rocker arm is not working as it should
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post #3 of 10 Old 08-20-2019, 05:34 AM Thread Starter
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Ok can low ficm voltage or bad injectors cause this.
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post #4 of 10 Old 08-20-2019, 05:46 AM
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The thumping of the intake is a result of a valve not fully opening. In long service its a characteristic of a failed lifter. It can also happen if the bridge was not installed correctly, a pushrod is bent, internal lifter leak or not filling with oil. It also happens as it did for me if the lifter drains down and takes some time to be refilled by oil pressure after a long sitting period.

With the Colt Stage 2 cam, was the piston to valve clearance checked? Valve recession depths?
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post #5 of 10 Old 08-20-2019, 12:12 PM Thread Starter
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Yeah all clearances was check when main and cam bearings was installed. The front lpop oil seal was leaking when I started it first time bet it lost gallon of oil or more. Just started to make sure it wasn’t leaking and had thump. Immediately shut it down. I’m betting it just needs oil
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post #6 of 10 Old 08-20-2019, 05:04 PM
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No, not the bearing clearance. The piston to valve clearance as the engine is rotated. Colt says you need a minimum of 0.030 on both the intake and exhaust valves or you can have piston/valve contact and bend a pushrod, or worse if they are the stronger pushrods.

Yes, you can pump down a lifter. Hopefully its just that.
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post #7 of 10 Old 08-24-2019, 02:56 PM Thread Starter
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Just to update pulled covers and passenger side front cylinder, first pushrod was bent. What would cause this.
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post #8 of 10 Old 08-24-2019, 04:52 PM
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Rocker arm or bridge out of place maybe -- re-install and hand turn the engine over watching for problems

In my defense, I was unsupervised
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General note:
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post #9 of 10 Old 08-25-2019, 10:26 AM Thread Starter
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So to update put new rod in and noticed the rocker arm was broke also. So I put new arm and pushrod in and bent it again. Checked valve bridge and it was in backwards. Re-installed everything and all is good.
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post #10 of 10 Old 08-30-2019, 11:38 AM Thread Starter
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No start no boost

Fresh rebuilt motor. It ran just fine except no boost. I unplugged VGT and could hear a change when I did this. I was throttling truck up and down to see is it would build any boost the gauge would move just a little. When I throttled truck up to about 2000 RPM truck dies and that’s it won’t start back at all. So I removed turbo just to make sure unison ring was ok since truck had 175,000 miles on it and I just bought it and had engine completely rebuilt. I’m tired of pouring money into a work truck I haven’t even got tags for yet. Please help.
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