Obnoxious whining noise cm 871 front engine

[Rawze]

(08-02-2018 )Big red 09 Wrote:  Hello I have an 09 isx 525/1850 and the engine had an inframe rebuild at 936000 miles and now has 953000 miles I brought up the noise in front of motor to service writer when rebuilding the motor but I don’t think I was taken seriously It is coming from very front of engine gear train not belts pulleys but in amongst the gearing This has been a very good engine mechanically and even emission wise and was told when engine was tore down that the inside was great condition Anyway the noise from front of motor is fairly quiet on cold start up but after about five minutes it gets louder and stays at same loudness all day I have read some things here as to oil pumps concept gears etc I am looking for some advice as to what this is I have put on 400000 miles on this truck and was no where near this noise Thanks in advance to any knowledge out there thank you

I have heard a lot of them make gear train noise in the past. If you can stand 25 feet or so away from the truck and hear that medium tone gear train noise above the sound of the engine at idle, then something is wrong!. My own experience with this is that most of the time, it was a worn out gear pump if it is an older truck, or a gear pump that has been shimmed incorrectly...






-- But like others have said, It can also be one of the scissor/concept gears mis-aligned or with a bad bearing in the front.

If it were mine, I would start by replacing the oil gear pump (even if it was replaced during inframe) and ensuring it is shimmed correctly according to quickcerv. This is also the easiest component replace when dealing with this kind of issue. After that, you will have to pull the front gear train apart, and that is not as much fun.

-- Personally, i would have demanded whoever in-framed the engine to fix it properly right off the bat. An extra loud whine in the front of the engine is a sign of a future failure, perhaps a catastrophic one. The shop giving you bulls$it excuses is exactly that!. -- Tell them to make it right and stand behind their work!. -- Did they not even test drive the damn truck?. It makes a person wonder what other shitty things and lazy-man shortcuts might have gone on inside that engine while it was apart. Last I checked, they cost about $36,000 dollars to replace so someone had better get off their arsse and muster up some decent amount of give-a-sh$it!.