2003 Mazda 6 Engine Belt Tensioner Pulley Rattle: RESOLVED & REPLACED!!!

I replaced the belt/serpentine tensioner pulley, idler pulley, serpentine belt, and spark plugs on a 2003 Mazda 6 2.3l car. This engine had 115k miles. I don't know if these parts have been replaced before. By the looks of the spark plugs, those seemed to be the original plugs. As for the belt, it could have been changed earlier in its life; same goes with the pulleys, but i could be wrong.

Anyway, the issue we had with this vehicle was, during cold startups in the morning, or Winter, a rattling noise was heard coming from the engine bay during take off at around 2,000 RPM. Once the engine warmed up, the rattle went away and operated normal.

I did a little research and found that this was a common thing for these engines. I first performed the easiest and cheapest mod, ADDING TWO LAYERS OF TIRE TUBE ON THE ENGINE MOUNT. This did not help the noise go away. If this was the cause of the rattle, replacing the engine mount would have only fixed it temporarily and cost me who knows how much. I found a inner tube and cut two pieces in square shapes to fit between the engine mount and mount plate. This mod should last another 50k-100k miles.

Next, I replaced the idler pulley, belt tensioner pulley along with a new serpentine belt (and spark plugs, because why not!). By replacing the two pulleys, the rattling noise that was heard at around 2000 RPM on cold days was fixed. Engine runs smoother too with the new plugs.

I'd say this is not a very hard job to do and does not require special tools. Tools i used were open-end wrenches, ratchet and 14mm socket, flat/phillips head screw drivers, and a jack.

Parts replaced:
Belt Tensioner Pulley: 305372 (Duralast)
Idle Pulley: 38006 (NAPA) or 231107 (Duralast)
Serpentine Belt: 5060885 (DAYCO)
Spark Plugs: NGK 7164

-----------------------------------------------------------

SUBSCRIBE HERE:
   / fivefoot  

-----------------------------------------------------------

SOCIAL MEDIA:
TWITTER:   / five_ft  
INSTAGRAM:   / yofivefoot  

-----------------------------------------------------------
My gear:

Dell XPS9560-5000SLV-PUS: http://a.co/bQe5ZFV
Zhiyun Crane V2: http://a.co/5qnDPPu
Sony a6300: http://a.co/bYKzRFD
Sony SELP18105G E PZ 18-105mm Lens: http://a.co/6RoeOw8
Sony SEL50F18 50mm f/1.8 Lens: http://a.co/ezFgqGe
Sony FDRX3000 4K Camcorder: http://a.co/cCMn0JS
Sony HDR-AS200V: https://amzn.com/B00R1COCVI
RODE VideoMic: http://a.co/bsc78Kt
Purple Panda Lavalier Lapel Microphone: http://a.co/bFMPjUb
GitUp Git2 Pro: https://amzn.com/B017DZ2KE8
Manfrotto Mini Tripod: https://amzn.com/B00GLXV3TW

-----------------------------------------------------------

Disclaimer:
Due to factors beyond the control of Five Foot, I cannot guarantee against improper use or unauthorized modifications of this information. Five Foot assumes no liability for property damage or injury incurred as a result of any of the information contained in this video. Use this information at your own risk. Five Foot recommends safe practices when working on vehicles and or with tools seen or implied in this video. Due to factors beyond the control of Five Foot, no information contained in this video shall create any expressed or implied warranty or guarantee of any particular result. Any injury, damage, or loss that may result from improper use of these tools, equipment, or from the information contained in this video is the sole responsibility of the user and not Five Foot.