Moparts Tech Archive
Exhaust Seaking & LeaksDo Exhaust Leaks and Valvetrain Noise sound different?
Heard a tapping/clicking noise today after making a 20-minute trip on the freeway (3,500-RPM at 75-MPH with 4.10 gears).
Not sure if the noise I hear is valvetrain noise from the moderate/high sustained RPM or an exhaust leak(s) due to the weight of the new exhaust/disturbance of the system.
I DO have hangers for the exhaust, but who knows.
Any way to tell which it is (exhaust or valvetrain) before I buy new gaskets?
I tightened/re-tightened the header bolts and added 1/2-Quart of Marvel Mystery Oil to the crankcase to (I hope) quiet any noisy lifters.
The valvetrain consists of 292/.510 Hyd Cam, Chrome/Moly Pushrods, HD Stamped-Steel Rocker Arms and the heads/Valves/Springs are around a year or so (low milage, infrequently driven) old
i can tell the diff . but only from experience, if you want to check here are a couple of back yard ideas, take a thick towel and cover your valve covers if it dosent muffle the noise that aint it. or alittle messsssssssier way is spray some wd 40 on the ex. man where it meets the head and listen for a slight muffled sound.
They sound almost the same. my buddy had a cherokee and it was making a clicking sound. we both though for sure it was the valve train. it turned out the exhaust manifold was cracked.
Hard to tell difference, Try starting cold engine use fingers to check for leaks around headers before exhaust gets to hot,BE CAREFULL may have to let it cool and try more than once. If sticky lifter change oil and substitute 1 quart tranny fluid with oil,high detergent in tranny fluid will free most sticky lifters.
I have many with my crappy heddman headers so i'm pretty good at telling the difference. Sometimes depending on where the leak is, it will get louder when you get on the throttle, like someone stuck a piece of paper over your exhaust.
Double up the header gaskets. They only run 10 bucks a pair. Ive had OK luck with Mr . Gasket header gaskets, and only fair luck with the Fel Pros.
Its hard to detect a leak with the stets. the easiest way is to get a piece of 3/8 rubber gas line 3 or 4 ft long . put one end to your ear and feel around with the other end around the header. if you have a leak , you will diffinately find it.
Right on mopar_man. I actually have a set of doctors ears (stethoscope) for noises and I use just the hose part like mopar_man said for exh leaks and you will know when you find the exh leak. Ron