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Go Back   Dodge Cummins Diesel Forum > 2nd Gen. Dodge Cummins 98.5-02 24V Forums > 98.5-02 Powertrain
98.5-02 Powertrain Discussion of components that are directly involved in the power production and all that is needed to get and keep the truck moving . Engine , Transmission Ect..NO ADVERTISING .

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Old 10-25-2012, 08:58 AM   #1 (permalink)
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Engine knock.

I recently got a engine knock. Is there any oil additive I can use to help thicken and help reduce the sound. Thanks.
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Old 10-25-2012, 09:18 AM   #2 (permalink)
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i doubt that the knock is caused by worn oil.

the timing is controlled by the IP, and pop pressure. if you developed an engine knock its usually one of those two issues.

i would pop and flow test your injectors first then go from there.

raising the viscosity of the oil, you can't 15w-40 is the normal, unless you want to go for regular 30w, but then you will loose the operating temp viscosity.



i would run the truck and use a stescope to find where this knock is coming from, and then go from there.

be forewarned that these engines are nortious for having their 1st cylinder to be off a bit just enough to cause it when its cold on my trucks anyways.
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Old 10-25-2012, 09:42 AM   #3 (permalink)
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What kind of knock. Fuel, rod, tick, slight knock, big knock....
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Old 10-25-2012, 04:48 PM   #4 (permalink)
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Its not from worn oil since it might have 100 miles on the new oil. But it's a bad rod bearing. Just trying to quite it down to trade it off.
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Old 10-25-2012, 05:02 PM   #5 (permalink)
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Quote:
Originally Posted by Cumm02 View Post
Its not from worn oil since it might have 100 miles on the new oil. But it's a bad rod bearing. Just trying to quite it down to trade it off.
There's a couple of ways to quiet a worn engine but I'm not going to divulge how.I got burnt before buying what appeared to be a good second hand car and at the normal value for it at the time only to discover a hundred or so miles later the crankshaft was toast.As far as I'm concerned, man up and tell any prospective buyer about the engine issue.
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Old 10-25-2012, 07:35 PM   #6 (permalink)
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There's a couple of ways to quiet a worn engine but I'm not going to divulge how.I got burnt before buying what appeared to be a good second hand car and at the normal value for it at the time only to discover a hundred or so miles later the crankshaft was toast.As far as I'm concerned, man up and tell any prospective buyer about the engine issue.
That's fine if you don't want to... But thanks for ur input
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Old 10-25-2012, 08:29 PM   #7 (permalink)
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I'm beginning to question if it is a rod bearing. Because i just went out to see if it would start after a week of sitting and the knock didn't come on till 20-30 seconds. Maybe it could be oil pressure related? But my oil pressure is about 40psi.
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Old 12-10-2012, 01:13 PM   #8 (permalink)
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Originally Posted by pepsi71ocean View Post
be forewarned that these engines are nortious for having their 1st cylinder to be off a bit just enough to cause it when its cold on my trucks anyways.
I found my 01 HO has a knock/tick when its cold. You can hear it well when you 1st fire it up. Does about 2-3 notable ones then calms down a bit. I noticed untill you get up to 190F in between shifts you will hear it tap/knock when the revs drop to about 1200 rpm. Thats the most noticeable rpm. Does not get worse with rpm. When i crack the #1 injector it quiets down and when you first sinch the injector tight it wil tap fairly loud a couple times when you retighten. THen quites down to a dull tick/tock. Hard to describe but its not a heavy knock. Kind of sounds like a worn lift pump lobe on a 12v.

The previous ovwner had it checked out at dodge and they said it wasin the programming ?

When you say 1st is off do you mean the IP timing ? is this a computer thing or pump releated ?

My truck had a new vp,injecotrs,lift pump. He said the noise was there before he changed any of the fuel system.
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Old 12-11-2012, 04:57 PM   #9 (permalink)
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Originally Posted by moparguy55 View Post
I found my 01 HO has a knock/tick when its cold. You can hear it well when you 1st fire it up. Does about 2-3 notable ones then calms down a bit. I noticed untill you get up to 190F in between shifts you will hear it tap/knock when the revs drop to about 1200 rpm. Thats the most noticeable rpm. Does not get worse with rpm. When i crack the #1 injector it quiets down and when you first sinch the injector tight it wil tap fairly loud a couple times when you retighten. THen quites down to a dull tick/tock. Hard to describe but its not a heavy knock. Kind of sounds like a worn lift pump lobe on a 12v.

The previous ovwner had it checked out at dodge and they said it wasin the programming ?

When you say 1st is off do you mean the IP timing ? is this a computer thing or pump releated ?

My truck had a new vp,injecotrs,lift pump. He said the noise was there before he changed any of the fuel system.
it is most likely i think just the design, when fully warmed up and the serpentine belt missing you can use a laser gun to shoot the exhaust manifold and see which one runs cooler then the others and that is the one, it is 9/10 either cylinder 1 or 5.

My truck its cylinder 5, it runs about 50- cooler then the others usually.


From what i have gathered it is completely normal, and for all we know it could be there to cause some load on the motor to allow it to warm up when its cold out.
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Old 12-12-2012, 09:00 AM   #10 (permalink)
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Check out your flexplate. Mine has a nice knock in the bottom of the motor. After further inspection it comes out of the bellhousing. You'll find some aluminum shavings in there and with the inspection cover off it will get louder. I also had an oil analysis done and they said no way it was bad bearings. I haven't had time to change it out yet but ill post pics of it when I do.
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Old 12-12-2012, 12:12 PM   #11 (permalink)
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Originally Posted by pepsi71ocean View Post
it is most likely i think just the design, when fully warmed up and the serpentine belt missing you can use a laser gun to shoot the exhaust manifold and see which one runs cooler then the others and that is the one, it is 9/10 either cylinder 1 or 5.

My truck its cylinder 5, it runs about 50- cooler then the others usually.


From what i have gathered it is completely normal, and for all we know it could be there to cause some load on the motor to allow it to warm up when its cold out.
Thanks for the info
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