Tim Modine Posted May 15, 2019 Share Posted May 15, 2019 First post here and looking for advice. I've got an 07 CH 613N with AC460 engine. Ive recently heard a strange noise that is consistent with RPM. It kind of sounds like a bad pulley or loose belt skretch, most noticeable in low to mid range Rpm . Changed both belt tensioners, new fan belt, A/C belt is about 1 year old and made no change. My first question is, are there any warning signs to the clutch fan failing and second the canister where you add engine oil sounds as if there is an impeller inside and when shut truck down it makes a noticeable groan noise along with vibration when hand placed on on it. Any thoughts would be appreciated. Thank You, Tim Modine Quote Link to comment Share on other sites More sharing options...
Tim Modine Posted May 16, 2019 Author Share Posted May 16, 2019 Pic of canister where eng oil goes in and where i get like an impeller winding noise on shutdown. Other pic is of a valve that goes to the coalescing filter, and does anyone know what the purpose of the valve is for? Image isn't my engine, its just used to reference for questions. Thanks again if anyone has some information Tim Modine Quote Link to comment Share on other sites More sharing options...
mrgumby Posted May 16, 2019 Share Posted May 16, 2019 If your hearing that winding vibrating noise at shut down only it the centrifuge filter spinning and slowing down till it stops Pretty common if you never heard one before to think something is wrong but it normal Some seem to make more nois than others Just remember that’s a filter so don’t forget to change it with you oil change I’ve seen some guys not know there’s a filter in there 1 Quote Link to comment Share on other sites More sharing options...
mrgumby Posted May 16, 2019 Share Posted May 16, 2019 That valve if I remember is to shut the air to the turbo control air filter catridge so when you change the filter it shuts off the air to it then after you change filter turn it back on. 1 Quote Link to comment Share on other sites More sharing options...
mrgumby Posted May 16, 2019 Share Posted May 16, 2019 In the strange noise that sounds like a belt have you checked all the hoses and clamps on your intake and turbo hoses could be a leaky hose loose clamp or charge air cooler leak 1 Quote Link to comment Share on other sites More sharing options...
Tim Modine Posted May 16, 2019 Author Share Posted May 16, 2019 Thanks mrgumby! For the info on the centrifuge filter and valve for turbo. I’ll have to go in and look at all the connections and hoses to turbo. Thanks again! Quote Link to comment Share on other sites More sharing options...
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