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Mystery Noise.

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jimsnjos
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Joined: Sat Dec 15, 2018 11:30 am

Mystery Noise.

Post #1 by jimsnjos » Tue Dec 25, 2018 11:49 pm

When driving my 55 F-100 with the 223 six cylinder engine, the engine develops a high pitch rattle or clatter just before I back off the throttle and shift gears. This noise does not occur under load, acceleration, or compression or when I let off in gear. I have checked and re-set the valves according to specifications. For fear of damaging the engine I have stopped driving the vehicle.
If any of you have a suggestion or have had experience with such a condition I would really appreciate any feed back from you.
Thanks in advance.

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bubba22349
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Re: Mystery Noise.

Post #2 by bubba22349 » Wed Dec 26, 2018 12:03 pm

:hmmm: is there a chance you can post a video of it? :thumbup: :nod:
A bad day Drag Racing is still better than a good day at work!

I am still hunting for a project car to build but with my current low budget it's not looking so good. My Ex- Fleet of Sixes these are all long gone! :bang: 1954 Customline 223 3 speed with O/D, 1963 Fairlane project drag car with BB6, 1977 Maverick 250 with C4, 1994 F-150 a 300 with 5 speed.

jimsnjos
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Joined: Sat Dec 15, 2018 11:30 am

Re: Mystery Noise.

Post #3 by jimsnjos » Wed Dec 26, 2018 5:18 pm

Thanks for your interest however right now I do not have the capability to record a video or the sound of it. Great thought however and I'll see if there is not a way to do so.

78merKri6
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Re: Mystery Noise.

Post #4 by 78merKri6 » Wed Dec 26, 2018 10:50 pm

Wrist pin or cracked piston.
sVehicles: 93 F150 4x4 300BB,stock w/dual outlet Clifords ; 78 Mercury Bobcat w/250SB andC4 auto 2800 stall,milled head, Holman- Moody cam,Offy,3 singles (Holley), port divider, homemade headers; 65 Mustang coupe 200 6 w/C4,stocker--driven&shown.

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B RON CO
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Re: Mystery Noise.

Post #5 by B RON CO » Thu Dec 27, 2018 10:27 am

Hi, can you see if it makes the noise in neutral?
Maybe it is a simple as a bad motor mount.
Check to see nothing is flopping around. Yank and wiggle everything from the grill back to the firewall.
Good luck
B RON CO. Still workin' on it!

1933 Ford Pickup - 59A Flathead V8
1966 Ford Bronco - U14 - 170/200 Straight 6
1966 Ford Mustang - 289 V8

jimsnjos
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Joined: Sat Dec 15, 2018 11:30 am

Re: Mystery Noise.

Post #6 by jimsnjos » Thu Dec 27, 2018 11:03 am

Thanks fellas, both good thoughts and suggestions. The mystery sound appears to be coming from the top end, like the valve train. Thinking perhaps that it could be a weak valve spring? I have tried to duplicate the sound with the engine out of gear and bringing the rpm's up to speed but that does not duplicate the sound. It only occurs when I reach that sweet spot when you pause to shift gears. My plan today is to get a tachometer on the engine, drive it and see what rpm the sound begins to develop. Thanks again for you time and suggestion.

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