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  #1  
Old 05-15-2018, 12:26 PM
me2 me2 is offline
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Default Name this engine noise... (video)

Was running errands. Started it after it sat for a bit and it made this sound. Towed it home.

What is wrong with my engine ?

https://www.dropbox.com/s/dvn31mjk4x...84126.mp4?dl=0
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I regularly pull 25K lbs with my 185 HP (but it's tired so probably closer to 170HP) 7.3 IDI all the time. It's not the HP that matters, it's the 360-ish lbs of torque that move the load.
  #2  
Old 05-15-2018, 01:12 PM
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is it missing at all? pull the oil fill cap off and see if it is a steady stream or a rythmic puff-puff-puff. Pull the air intake and see if the noise is louder towards the turbo inlet.
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Old 05-15-2018, 01:17 PM
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Is it safe to run ? It knocks pretty hard in real life.

I'd say there is no significant miss fire. This happened at idle. I never revved it up.

Any chance it is a sticking valve and I could just replace the head(s) and have a running engine ?

It was down on power a bit before it did this. Didn't rev out properly. It threw a code a few days before this. I haven't pulled the code yet.
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I regularly pull 25K lbs with my 185 HP (but it's tired so probably closer to 170HP) 7.3 IDI all the time. It's not the HP that matters, it's the 360-ish lbs of torque that move the load.

Last edited by me2; 05-15-2018 at 01:37 PM.
  #4  
Old 05-15-2018, 01:46 PM
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It has 200K miles on it. It is completely stock.

It was regenning quite a bit before it happened. Fluid levels appear normal.

Broken crankshaft ?

Spun rod bearing ?

Dropped valve ?

Cracked piston ?

Head gasket ?
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I regularly pull 25K lbs with my 185 HP (but it's tired so probably closer to 170HP) 7.3 IDI all the time. It's not the HP that matters, it's the 360-ish lbs of torque that move the load.
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Old 05-15-2018, 01:51 PM
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not sure what "safe to run" is, its damaged now...and most likely will require a complete teardown to repair.

if the thumping is in the intake when you remove the air cleaner, i would move towards a failed lifter or a valvetrain issue.

if there is a puff puff puff out the oil fill, i would suspect cracked piston.

No, it wont be a sticking valve.

I have never seen a broken crank on a six four.

Dropped valves usually barely run and make a ton of smoke while doing so (typically whats left of the piston is in the pan and the rod and wrist pin are clanking around the cylinder).

Pull the code and see what it is.

Drain the engine oil and see how much/what material comes out. Maybe cut the oil filter apart too.
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Old 05-15-2018, 02:08 PM
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Then it has to be a cracked piston or a spun rod bearing.

If it is these, can the engine be salvaged ?
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I regularly pull 25K lbs with my 185 HP (but it's tired so probably closer to 170HP) 7.3 IDI all the time. It's not the HP that matters, it's the 360-ish lbs of torque that move the load.
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Old 05-15-2018, 03:10 PM
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Probably a cracked piston. The regens were probably caused by oil blow by when the crack was small. Now the crack is big.

A spun rod bearing probably wouldn't just happen at idle and it doesn't explain the the regens before it happened.

Will the bore be ruined if the piston is cracked ?

Can the engine be pulled without removing the cab ?
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I regularly pull 25K lbs with my 185 HP (but it's tired so probably closer to 170HP) 7.3 IDI all the time. It's not the HP that matters, it's the 360-ish lbs of torque that move the load.
  #8  
Old 05-16-2018, 05:46 AM
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Could be a bad injector as well. If it was me i would be at the truck doing some diagnosis not drawing random conclusions on the internet.

No fuking way oil would get into the cylinder thru the crack in the piston anyway. cylinder pressure is thousands of psi.

I have seen cracked pistons caught in time and the bore was fine. I have also seen them scored. No way to tell without a teardown.

Yes the engine can be pulled out the front but its a major waste of time to do it that way.
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Old 05-16-2018, 06:36 AM
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Quote:
Originally Posted by sootie View Post
Could be a bad injector as well. If it was me i would be at the truck doing some diagnosis not drawing random conclusions on the internet.
How do you suggest I proceed with diagnosing it ? I have Auto enginuity.

Quote:
No fuking way oil would get into the cylinder thru the crack in the piston anyway. cylinder pressure is thousands of psi.
It sucks in during the intake stroke. Oil makes its way by the rings if the bore is messed up.

Quote:
I have seen cracked pistons caught in time and the bore was fine. I have also seen them scored. No way to tell without a teardown.
I was going to pull the heads with the cab on. Is that the next step ?


Quote:
Yes the engine can be pulled out the front but its a major waste of time to do it that way.
I'm garage less for the summer. I have to do this in my driveway. I've got a skid steer that I could use to lift the cab, but it would be a major pain to do so. Advice ?
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I regularly pull 25K lbs with my 185 HP (but it's tired so probably closer to 170HP) 7.3 IDI all the time. It's not the HP that matters, it's the 360-ish lbs of torque that move the load.
  #10  
Old 05-16-2018, 07:32 AM
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Quote:
Originally Posted by me2 View Post
How do you suggest I proceed with diagnosing it ? I have Auto enginuity.

I'm not familiar with AE, sorry. If i was using IDS or FORScan i would start with a relative compression test. Then i would shut down each injector individually and see if the noise changes or goes away with a certain cylinder.


It sucks in during the intake stroke. Oil makes its way by the rings if the bore is messed up.

Bullsh!t


I was going to pull the heads with the cab on. Is that the next step ?

I never do anything cab on. Not worth the sacrificed knees and loss of forearm skin.


I'm garage less for the summer. I have to do this in my driveway. I've got a skid steer that I could use to lift the cab, but it would be a major pain to do so. Advice ?
Not sure. I use a two post lift and cab removal is done in less than two hours.
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