Mr.Grid
Well-Known Member
Good post in Hemi Tic.What's interesting is that I was in a Jack N Box drive thru and once I got up to the menu speaker thing, I heard some alarming "ticking" from my truck. Once I drove away from the menu wall, it sounded fine.
I suspect the normal fuel injector sound was reverberating/magnified from the menu. I got out later and listened to the engine from the outside, then popped the hood and listened a bit closer. It was clearly the fuel injectors doing their thing.
Injection can be noisy and varying in sound at idle. Exact same for the Hemi valve train at idle. The dealer will listen to all this at idle and say it’s normal which it is. At normal steady driving speeds you won’t hear any of this as the oil pressure is increased by over 20psi. All you should hear is road noise.
Broken exhaust manifold bolts and cracked exhaust manifold castings will have a more pronounced noise that will become faster in sound when engine speed increases as one drives. Checking for broken bolts and cracked manifolds is an easy procedure.
I replaced the broken rear exhaust manifold bolts on both sides of my 4th Gen Hemi myself. The bolts were broke even with the aluminum head. The proper way to get them out is to weld small 12mm nuts to the stud and back them out with a wrench. I rented a small 120v mig welder from Home Depot to do the welding that cost $50. It wasn’t that hard to do. For a professional it should be an easy repair.
Here’s how it’s done. In the video they show heating of the bolt heads which is not necessary.