01-04-2011, 09:48 PM
Hoping to get some help. I have a 73 Coupe with a 302 (F code). I have a tapping noise coming from the left side of the engine bay. I can hear it much better when I'm in the car. I had a friend listen and he thinks it's an exhaust leak. I thought it was a valve that needs adjusting. Anyone have experience with this? Is there any practical way to check for an exhaust leak?
Check around the exhaust manifold or header for black soot. Sometimes you can run the car and feel around the exhaust manifold while it is still cool and feel air pulses.
White 1973 (351C stroked to 408, 4V, FMX) convertible with blue deluxe interior AC and power windows.
Irwin Pa (MCA # 52193)
my experince is a rocker ticking and an exhaust leak sound close.
as vertstang stated check for soot or air pulses around manifold.hedder gaskets are notorious to leak. also check where the exhaust pipe connects to hedder or manifold whatever the case may be.may be just loose bolts there.to find out if rocker, i use a mechanics stethoscope .you can pick them up at autozone on the cheap. or my dad used to use a broom handle lol and put it to ear and engine.the stethoscope really workswell on locating noises in motor. if it is from a rocker have to pull valve cover check them for tightness if tight then maybe a pushrod slightly bent , lifter collapsing, or worse case cam lobe wiping , but u said motor runs fine so i suspect it is going to be an exhaust leak . good luck on finding it. lets us know what ya find.
in loving memory of my son ..Jason
All GREAT responses. I would like to piggy back on what "mach1 fever" said regarding the checking to eliminate the rocker arms as the source of the noise.
Like his Dad, I always use something from around the house, in this case a piece of hose (water or vacuum works fine).
With the engine running, put one end of the hose on the valve cover and the other to your ear. If the noise is coming from that area, it should be enhanced.
Hope this helps.
Do the RIGHT thing.