Rattle/ Grinding noise at idle and low RPM
 

Hi yall I am a diesel Newbie, I just bought my first diesel last thursday. the truck is a 2007 Ram 3500 ST DRW with about 116000 miles. The truck has a 6.7l and 6sp manual and is bone stock.. as far as I can tell, since I bought it used(no random tuners, or guages anywhere). About 100 miles away from the dealers lot, still burning their Deisel fuel. the truck began making a rattle grinding noise intermittenly less than 1200rpm the noise always stops once I get the RPM up. there is no black smoke, no change in performance at all. I put Biodeisel (B100) on my first fill up thinking that might lube up the fuel system and quiet thing down, the noise went away for while but then it returned after about 100 miles. and continues off and on. It sounds like it could possibly maybe be normal but then it has an unhealthy sound to it so maybe not. Does any one have any ideas or suggestions?

thanks

Input shaft bearing....possibly

https://www.dieselbombers.com/5-9-li...pd-manual.html

Would the input shaft bearing make a noise while the truck is standing still with the clutch pushed in?

As a general rule if the noise starts when you disengage the clutch (floor the pedal) it's the throwout bearing, if it starts when you engage the clutch (release the pedal) it's the input shaft bearing. I've heard of it being a crankshaft bearing too, but usually that noise is fairly constant with minimal change based on clutch being in or out.

The irony in this is that one of the reasons for buying a new truck is to get out of replacing the clutch in the old one! that being said the clutch doesn't seem to affect anything, which is one reason I am still dumbfounded about the root of the problem, it doesn't sound like any of those three choices. B/c of the independence form clutch position and the interermittance of the duration. though it doesnt soudn like the truckis going to leave me stranded. Thanks for the suggestions.

Can u pin point the sound?

Heres a a clip i found for you..

Using Biodiesel in 2007+ Vehicles
There has been concern over using biodiesel in newer cars. We have been waiting to see how the 2007+ vehicles fair with biodiesel. We now have some experience and knowledge and are willing to help people safely through the process.
Engine Oil Dilution – Is it a problem? New emissions reducing technology is found in 2007.5 thru 2012 light duty diesels (for example the Volkswagens, Mercedes, Ford & Dodge trucks). It’s a Diesel Particulate Filter (DPF) and is designed to remove diesel particulate (soot) from the exhaust gas of a diesel engine. To clean/regenerate the filter, the vehicle relies upon heat to burn off accumulated soot. If the filter becomes clogged before high engine temperatures are reached, a post combustion fuel injection is introduced to aid in burning off the soot. This extra fuel can make its way past the piston rings and into the engine. This may lead to engine oil dilution, which can shorten the life of your engine. This engine oil dilution is potentially more problematic with biodiesel than diesel because it’s higher flash point prevents it from vaporizing out of the engine oil. Study with 20% Biodiesel: No Abnormal Engine Wear Found after 240,000 miles In June 2009 the National Renewable Energy Laboratory published a study designed to quantify oil dilution and potential engine damage resulting from the use of B20 in newer cars containing DPF’s and other emissions control systems. In summary oil dilution did occur, but at the end of the trial (240,000 miles) no abnormal engine wear was found. To read more about how the tests were performed and the results: Download this PDF. 50% Biodiesel Successful Experience One local company has been running their 2007+ trucks on 50% biodiesel for a couple years. They change their oil every 2500 miles for the first 10000 miles, and every 5000 miles after that. They have been getting their oil tested and have not seen oil dilution after the first 10000 miles. One truck has over 50K miles on it and no problems.

I have seen this clip before ill probly drain some oil from the pan as was a bit high but not overly. I took the truck by a dealer they suggested something in the exhaust coincidentally after leaving them the truck threw a clogged catalytic code. Ill pop it off and. see if redneck straight piping helps.

Sometimes a sea foam engine flush gets all the crap out too... did you try that.? .:)

Ha i like cheap tricks!

so it worked?r whats it doing ?:humm:

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It will cough for a few days but cleans it out nice!.