Intake Deep Thump
Thread Starter
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Fleet Mechanic
Joined: Sep 2006
Posts: 1,491
Likes: 295
From: Fresno, CA
Intake Deep Thump
Getting a deep thumping noise from the inlet to the air filter. Had my truck for 1.5 years and it has always made this sound. Makes the sound all the time, hot or cold. Always thought it was just a normal diesel noise until I watched a DTRon video of a 6.4 with bad rockers that sounded very similar.
Video of sound:
https://vimeo.com/165702995
Truck has zero running issues. No smoke, fires right up all the time, mileage is good, power is good. 120k miles.
What do you guys think? Rocker issues? It's a very deep thumping. Most of the videos I've heard on youtube it's much higher pitched and a lot louder. You can barely hear it in the video.
I put my 24" breaker bar up to the valve covers on both sides and didn't hear anything odd, mostly just the diesel "cackle" but I wasn't able to get to the back on the driver-side.
Video of sound:
https://vimeo.com/165702995
Truck has zero running issues. No smoke, fires right up all the time, mileage is good, power is good. 120k miles.
What do you guys think? Rocker issues? It's a very deep thumping. Most of the videos I've heard on youtube it's much higher pitched and a lot louder. You can barely hear it in the video.
I put my 24" breaker bar up to the valve covers on both sides and didn't hear anything odd, mostly just the diesel "cackle" but I wasn't able to get to the back on the driver-side.
Thread Starter
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Fleet Mechanic
Joined: Sep 2006
Posts: 1,491
Likes: 295
From: Fresno, CA
So would that be a bent pushrod or just a normal noise?
Now that I'm more attuned to the sound it does get louder when the truck warms up.
Any way to pinpoint which one is making the noise? Tried listening again with my breaker bar and didn't have much luck finding an odd noise.
Now that I'm more attuned to the sound it does get louder when the truck warms up.
Any way to pinpoint which one is making the noise? Tried listening again with my breaker bar and didn't have much luck finding an odd noise.
Lead Driver
Joined: May 2014
Posts: 6,545
Likes: 13
From: Virginia Beach VA
You could remove a cover and measure them, about the only way to tell. The update is the 6.4 rod and if your going that far, just replace them and be done with it.
If you had IDM you could see a hole not running well.
If you had IDM you could see a hole not running well.
Thread Starter
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Fleet Mechanic
Joined: Sep 2006
Posts: 1,491
Likes: 295
From: Fresno, CA
Looks like the only way to do pushrods is remove the rockers. Doing that you either remove the headbolt (bad idea) or remove the injector and use the special valve compressor tool?
So would also need new injector O-rings and copper?
Saw on the 6.4 they made the rockers indepedant of the head bolts....
So would also need new injector O-rings and copper?
Saw on the 6.4 they made the rockers indepedant of the head bolts....
Thread Starter
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Fleet Mechanic
Joined: Sep 2006
Posts: 1,491
Likes: 295
From: Fresno, CA
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Logistics Pro
Joined: Feb 2013
Posts: 4,073
Likes: 5
From: TX
I'd be more concerned at this point with a pad push rod and taking out a lifter.....bad juju. How many miles on it with the thump? It's been 1.5 years so maybe it's not too special but then again.....
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Thread Starter
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Fleet Mechanic
Joined: Sep 2006
Posts: 1,491
Likes: 295
From: Fresno, CA
A little under 20k miles. Most of it easy going but I have done about 1,500 miles towing 8k trailer.
Definitely getting this fixed ASAP. Probably have to it to my mechanic, just don't have the time to have the truck down. I'm a slow/careful worker so my luck I'd probably have it down for two weeks!
Definitely getting this fixed ASAP. Probably have to it to my mechanic, just don't have the time to have the truck down. I'm a slow/careful worker so my luck I'd probably have it down for two weeks!
Logistics Pro
Joined: Feb 2013
Posts: 4,073
Likes: 5
From: TX
A little under 20k miles. Most of it easy going but I have done about 1,500 miles towing 8k trailer.
Definitely getting this fixed ASAP. Probably have to it to my mechanic, just don't have the time to have the truck down. I'm a slow/careful worker so my luck I'd probably have it down for two weeks!
Definitely getting this fixed ASAP. Probably have to it to my mechanic, just don't have the time to have the truck down. I'm a slow/careful worker so my luck I'd probably have it down for two weeks!
Tuned
Joined: Jul 2010
Posts: 360
Likes: 2
From: Greenville, SC
I remember some talk a while back about someone getting new pushrods and noticed a difference in length, but I don't recall the details.
Not trying to hijack the thread.
thanks
Hotshot
Joined: Dec 2003
Posts: 15,368
Likes: 121
From: Stuttgart, Ar
They are .050 shorter.
Thread Starter
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Fleet Mechanic
Joined: Sep 2006
Posts: 1,491
Likes: 295
From: Fresno, CA
Curious, how does that help matters? With a hydraulic lifter you aren't really worried about clearances from rockers to valves? It would make the valves open a slight bit less?
Also curious how the bent pushrod causes intake noise. I'm not doubting you guys, just want to understand. Thanks!
Also curious how the bent pushrod causes intake noise. I'm not doubting you guys, just want to understand. Thanks!
Lead Driver
Joined: Dec 2006
Posts: 6,496
Likes: 94
From: So. Jersey
Curious, how does that help matters? With a hydraulic lifter you aren't really worried about clearances from rockers to valves? It would make the valves open a slight bit less?
Also curious how the bent pushrod causes intake noise. I'm not doubting you guys, just want to understand. Thanks!
Also curious how the bent pushrod causes intake noise. I'm not doubting you guys, just want to understand. Thanks!
Thread Starter
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Fleet Mechanic
Joined: Sep 2006
Posts: 1,491
Likes: 295
From: Fresno, CA
Talked it over with my local diesel shop that works a lot of 6.0s. Said it could be lifters too. Researched those and damn that's a sucky deal to change. Looks like you've got to pull the heads to get to most of them, but the back ones you have to pull the motor or trans just to remove the back cover so you can remove the HP Oil branch tubes to gain access to the lifters. I'm going to take it to them and have them pull the valve covers and investigate. Hopefully just a pushrod or rocker arm!
Is there any way to even tell a lifter is bad without removing it to inspect the roller surface and its bearings or would a bent pushrod suggest a damaged lifter and you're screwed anyways?
Is there any way to even tell a lifter is bad without removing it to inspect the roller surface and its bearings or would a bent pushrod suggest a damaged lifter and you're screwed anyways?