05'mxs cat chirping noise in front

mine makes no chirping at all.

 

Some 6NZ C-15s (same basic gear train as MXS) have an unusual noise from the timing gears but I have never seen one fail because of it. If you pull the fan belts off and start the engine, listen for the noise, if you can still hear it then its an internal noise, if you cant hear it anymore then the noise is from the belts, pulleys, fan, alternator or A/C compressor (or any other driven component you have fitted). A lot of Freightliners out here had early hour Horton bearing failures with the spring applied type Horton so maybe its worth checking the fan drive out. if the noise is internal perhaps take an oil sample and see if there is anything in the sample that may suggest a problem.

 

Just pull the belts off and spin the fan, listen for any noise from the bearings.

 

The Horton clutch did nhave a recall or service bulliten on it. They had many of the clutches go bad and take out the radiator, hood, and whatever else got in the way. So basically which it closely and don't wait for it go out. If you can't find the moise, get a mechanics stehascope ( the spellings wron I bet) and you can track it down that way. I check my idler bearings about every 50,000 miles with one just to be safe.

 

let me know what ya find mine started same thing yesterday but it sounds more like a rough roar than a chirp , buddies truck started doing same thing too they are both 625 ......im bringing truck home this weekend to put in garage i'll let you guys know if i find anything defeniately in front of motor take belt off check idlers and tensioners, fan hub go from there almost sounds like turbo bearing

 

i had the same noise it was the horton fan hub. replaced it noise all gone

 

check your exhaust manifold might be blowed manifold gasket or could be broke turbo stud these twin turbos are nortoris for it my 625 has had the center section replaced twice for this...... just drove my truck home after driver telling me he had a noise sounds like exhaust leak to me i'll pull it in th garage to check it in the morning i'll let you know what i find on mine could even be a broke clamp on one of the bellows