I am new to this Forum and this is my first Diesel Truck, so please bear with me! lol

So I just picked up a New 06 2500HD, when I picked it up it had 11 hours and 80 miles on it. I noticed a little but didnt pay much attention to it around 100 miles but now (a week later) it has 500 miles on it and still has a valve knock on the top right bank of cylnders. (almost sounds like a lifter that sticks periodically but not sure what this sounds like on a diesel) What would cause this? I havnt had it over 2500 RPM since I have had it and kept it under 75mph. Since its 32V motor is this a DOHC motor or is it pushrod? I am not sure since I am new to the setup and mainly work on older muscle cars. (Go - Oldsmobile! lol)

I brought it in for service and had them take a look at it and they told me that they noticed it, documented it and have noted it in the computer as something to watch but they want to let the motor "break in first" before they start digging deep into it and are waiting for the computer to throw a code. Its not a constant tap or matches with engine revolutions its spuratic and is audiably noticable above the diesel idle noise.

Has anybody experienced this? or is there anything that I can do for a pre-emptive strike before things go off on the deep end and they try and blow it off or put the blame on user error??

Thanks! :help:

are you talkinga bout a typewriter type noise, or a real knock?

Typewriter one is normal.

It's a pushrod engine with 4v per cylinder. Until I saw the cut away of the engine, I'd have never guessed such a thing existed.

http://img326.imageshack.us/img326/2576/duramax4ip.jpg

Well you can distinguish it between the knocking of the diesel engine and the higher frequency of the valve kniock. its like "tick....tick.. tick.tick...............tick..tick............tick .. Its very random but I noticed it and even the GM guys noticed it coming out of the right bank (passenger side).

My dad has a 2004 Duramax and his doesnt do that at all. It definatly a differnt noice than the normal diesel engine knock though.

It's normal. Mine does it too. I hear it goes away after an oil change. Mine didn't start until the first oil change.

Interesting, I thought w/ a new motor it wouldnt do this, unless something was goofed up during production.

Did yours go away or is it still there?
If I find anything else out I will let you guys know.

It's normal, search for "typewriter tick". Mine hasn't done it for a while. Some claim that is is air bubbles in the oil and they are being compressed by the pump. No one that I know of has encountered any problems related to the "mysterious typewriter tick".