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Could really use some help - Engine knock

Ilikeoldfords
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Ilikeoldfords

Ilikeoldfords

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Probably the oil filter. I will pull the valve cover off this weekend just to check things over and check the valve lash. 

If I were to run the engine with the valve cover off what I make a big mess? Maybe I would be able to see something while the engine is running if there is a problem in the valve train. 

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TFaoro

TFaoro

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12 hours ago, CSM said:

Oil filter I think is what he is getting at

Correct. I should have been more specific. My bad!

3 hours ago, Ilikeoldfords said:

Probably the oil filter. I will pull the valve cover off this weekend just to check things over and check the valve lash. 

If I were to run the engine with the valve cover off what I make a big mess? Maybe I would be able to see something while the engine is running if there is a problem in the valve train. 

Yes, you can run it with the cover off. The worst thing that will happen is oil running off the back of the head. Not a big deal

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CUMMINSDIESELPWR

CUMMINSDIESELPWR

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not to scare ya but i dont think its a fuel issue either.

either a valve issue

wristpin failure

or conrod bearing failing (piston slap), i can hear the bang come after the compression/ignition stroke and it might be slapping the piston onto the head during the exhaust stroke

just my $.02 hope you find the issue and its an easy fix

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Wild and Free

Wild and Free

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I can't even think how many times I have seen and heard knocks like that and worse all caused by injector issues. have seen a lot of wasted time labor and parts costs thrown at equipment by misdiagnosed knocks where folks thought it was internal versus fuel related.

 

Start simple and work your way in, do not tear in and work your way out.:wink: Crack injector lines then go with an infrared heat gun and hit the exh. manifold ports looking for a cold cyl then go from there.

Remember you are diagnosing a diesel not a gas engine.:smart:

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Mopar1973Man

Mopar1973Man

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Along Wild & Free idea I would pull the injectors out for pop testing and inspection. While they are out you can do compression test verify the engine health. Minimal impact and tear down but gives clues. Also while the valve cover is off you can check valve lash on the valves easy enough.

Typically a bad injector would continue to smoke wouldn't it? (cracked tip or blown tip) :think:

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Wild and Free

Wild and Free

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Can't say its and injector yet, they can only do what the IP makes them do, if the IP can't make enough pressure to pop the injector it could be the VP yet causing issues that have not yet fully developed to causing a code or other symptoms. Just need to wait and see where his digging leads us at this point.

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Mopar1973Man

Mopar1973Man

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3 hours ago, Wild and Free said:

Can't say its and injector yet, they can only do what the IP makes them do, if the IP can't make enough pressure to pop the injector it could be the VP yet causing issues that have not yet fully developed to causing a code or other symptoms. Just need to wait and see where his digging leads us at this point.

The only problem there is typically a bad VP44 or PSG would make it random in nature of knock because of failure. But to have a good rhythm. Still that is cylinder based or valve based. Even weak injectors have a random hit / miss type of problem. Not unless the injector is stuck open or horrid pop pressures that way low. Even then would be starting issues from loss of prime. :think:

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Ilikeoldfords

Ilikeoldfords

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Thank you guys for all the leads. I was going to start digging in on it today but it has been snowing all day here and I have come down with a wicked cold. I know, I know I am just being a pansy and need to fight through it :moon:

If the weather is better tomorrow and I am not dying I will definitly jump on it. This is the first time my truck has ever been down and even in the last few days I have been feeling it already.

I will post any and all findings ASAP.

Thanks again for all the support. Kind of sucks being the broke down one after all this time.

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Ilikeoldfords

Ilikeoldfords

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Ok I have it narrowed down to a cylinder. I went through and loosened up the injector lines one by one and the knock completely went away when I loosened #6. Apart from the dead miss all the extra noise was gone until I tightened the line back up.

On a side note, I just noticed there is a lot more blow by then normal too :doh: It is almost enough to lift the oil fill cap all the way out of the hole when just sitting in the valve cover. That is not a good sign.

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