If you dont have excessive blowby a compression test may be un-neccessary because it is quite expensive. All that will tell you is if your rings are maintaining cylinder compression. If your rings arent sealing properly, the smoke comming out of your truck will be grey. Check oil levels too. If they are dropping or rising, your rings are bad and need attention.
With note to transmission, it could be that input shaft rattling around. If you say nothing changes when you let off the clutch then it could definetly be transmission related. But usually at idle you will notice that input shaft rattling with the clutch disengaged

 

[quote=6spd05Dually;3176134]As near as I can tell it is coming from number 5 or 6 or possibly near the front of the tranny

 

It uses no more oil then normal maybe a quart every 3 or 4k I. Am sure it leaks more then it burns based on how much oil is on things tipical for 275k

 

Do you have substantial leakage?

 

JB, what do ya think? A quart in 4K is about a drop every 2000 feet.

mw, Oil on the barrels of the injectors is the residue left after a very slow leak at the tip/barrel joint evaporates before it gets up to the clamp nut. Pretty normal on old injectors.

Your blow by and oil consumption are fine. You should adjust the valves more often, do that and see if it helps. While yer at it, put a torque wrench on head bolts and make sure none are real loose. Just try them at about 90 ft./lbs. hoping for no movement.

Next bet would be to pull the injectors and have them checked out for pop pressure, leakage, pattern and flow. You probably will get a recommendation for re-tipping, or if the barrels are pitted, new injectors.

After that it gets to be a crap shoot, changing parts like the delivery valves and such, or serious diagnostics, like using an accelerometer and o-scope to check the dynamic pressures at the injectors, and also looking for other sources of noise.

Good luck

 

No it won't even leave a spot on the ground that I have ever seen.

 

Ok I check the valves all is good so I got out my redkneck stethascope and listened at each valve cover. And what I discovered was that 1 2 3 and 6 all sound about the same pretty fast clatter of injecters but 4 and 5 are a little deeper tone and are quite a bit slower. Thoughts? Now another thing I for got to mention at the beginning is that I had the injection pump replaced at 250k under the recall and 1200 miles later it went tites up on me and they warrnetied it long storie there but now all is well with the pump. Could sum crap from the bad pump made its way to those injecters and smoked them?

 

The holes in stock injectors are .012" in diameter. What do you think?

 

Thats what happened to me causing my injectors to fail.

 

we can sit here and kick the can around, but if he wants to really know if it's the injectors, pull them and have them tested.

 

Well took my injecters into idaho diesel tech today they tested for free and said the are most defanitly making noise but not ruined. Thanks for all youalls input. O and they highly recomend stadadyn fuel adative

 

what were the flow rates?

 

54+- lpm