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Author
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Topic: engine sound
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FiveLiterDreamer
Journeyman Posts: 56
From: Hot springs, AR
Registered: Feb 2001
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posted 10-26-2001 03:42 PM
  
I just finished building my first 302 about 5wks. ago. It has been running great and havn't had any problems with it....until now. About a wk. ago, it developed a small tak-tak-tak-tak sound. Its seems to be getting worse. For about the first 3 wks, I had a loud exhaust leak in the back of the heads that were suppose to be blocked off. I finally put bolts in the holes and then i was able to hear a slight tak-tak-tak sound. I thought it was the natural sound of the 302's timing chain. When i start my car and it hasn't warmed up yet, thats when its the loudest. After it warms, the sound isn't as noticeable. Its a rythmic sound that correlates with the engine speed. When the rpm increases, the sound speeds up, and seems to disappear when the rpm is high enough. It may just be drowned out by the sound of the car though. When i idle it down real far, the sound is louder. From what i can tell, its coming from the front of the engine. At first, i thought maybe a rod was knocking, so i pulled the spark plug wires off the cylinders towards the front of the engine, and it didn't change anything. It's not coming from the valve covers or intake manifold, so i don't think its a lifter problem. I have no idea what this sound could be. I figured that some of you fox body guys would have more experience with 302's than most. If anyone has any thoughts, then let me know. Thanks for the input.
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7DMACH1
Gearhead Posts: 631
From: PHILA. PA.
Registered: Feb 2001
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posted 10-26-2001 03:46 PM
Exhaust manifold or header gasket leak. You should retighten all bolts after 100miles on a fresh engine. RAY------------------
RAY . FLY THE FLAG, SHOW THE WORLD WE ARE PROUD AMERICANS!70 MACH 1 351C NOW 408 STROKER 4SPD.
86 MERCURY CAPRI 5.0 RUNS 12.86 @107 1.65 60 ft.
2001 LINCOLN LS V8 1997 MUSTANG
SHOW THE WORLD, LIGHT A CANDLE.
http://www.geocities.com/slariviere/7DMach1.html
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FiveLiterDreamer
Journeyman Posts: 56
From: Hot springs, AR
Registered: Feb 2001
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posted 10-26-2001 04:38 PM
I've already done that. its not an exhaust leak. its some type of contact sound. something contacting something else...i think.
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Gearhead
Gearhead Posts: 1476
From: Vancouver Island, Great Wet North
Registered: Mar 2000
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posted 10-26-2001 05:10 PM
Afer doing some repairs on my engine I put it all back together and had a tapping sound from the front of the engine that varied with engine speed. Turned out that the timing pointer got bent slightly during installation and was getting nicked by the harmonic balancer. Drove me about nuts finding that little noise!!Just something to check... hopefully it's something simple like this. ------------------
Cheers,
Ian
M&M Member #395
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'79 Mustang Indy 500 Pace Car
Ian's Pace Car Website
Vancouver Island Mustang Association Website
Indy Pace Car Registry of Mustangs Official Website "If you get to thinking you are someone of some importance and influence, just try ordering another persons dog around." - Author Unknown
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cpmaverick
Moderator Posts: 1089
From: Auburn, AL.
Registered: Jan 2000
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posted 10-28-2001 04:34 PM
I had a similar noise, I even pulled the valve covers and intake and retorqued my lifters and rechecked clearances. Turned out to be an exhaust leak! I didn't think they could sound like that but I would bet that is what your problem is (even if you disagree  )
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wythors
Gearhead Posts: 2549
From: The cold, gray Pacific Northwest
Registered: Sep 2000
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posted 10-29-2001 09:09 PM
If you haven't done so already, take about a 3-foot length of fuel line and stick one end your ear and run the other end around all the exhaust ports on the cylinder head while the engine's running. This is the best way I've found to be able to hear an exhaust leak and isolate it.------------------
Dave 1993 5.0 LX convertible.
Part-time driver of one badass black 96 Cobra.
MCA Member #47838
M&M Member #666 September 11, 2001 - Never Forget
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