Interesting tinny sound at startup

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Mark Osterman
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Interesting tinny sound at startup

Post by Mark Osterman » Sun Jun 16, 2019 10:12 pm

On the last few cold starts I’ve heard a strange metallic tinny sound that eventually goes away in about two or three minutes. Always thinking the worst I thought it was something loose in the transmission imagining some piece that fell off and is kicking around in there. I lubricated the fan thinking this might be the problem; nope. I changed the oil thinking I might find something in the oil ... nope.

Then the next time it happened I thought it came from underneath so I quickly climbed under and it sounded strong around the muffler and pipe assembly. I thought that maybe when I changed the manifold gaskets recently I may have put the exhaust pipe back in a way that caused a rattle. So, I loosened up the pack nut and tightened it while wiggling the pipe to seat it. It still didn’t make much difference. So, I’m still wondering what’s making the sound ... but at least it goes away once the engine’s hot. Could be because I’m using a cast iron end muffler and the pipe is simply pushed into the inlet hole. It’s probably something really simple like once the pipe gets hot it fits differently. I was once told that when you hear hoof steps behind you ... think horse ... not zebra. I’ll figure it out.

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Rich Eagle
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Re: Interesting tinny sound at startup

Post by Rich Eagle » Sun Jun 16, 2019 10:21 pm

The carburetor heat pipe has fooled me before. You might check where it is bolted to the manifold clamp. You may recall I pulled the oil pan inspection cover looking for a rattle before I discovered the former.
Rich
When did I do that?

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Rich Eagle
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Re: Interesting tinny sound at startup

Post by Rich Eagle » Sun Jun 16, 2019 10:22 pm

Sorry, a double post, and edit.
When did I do that?


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Mark Osterman
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Re: Interesting tinny sound at startup

Post by Mark Osterman » Sun Jun 16, 2019 10:48 pm

I’m not using a heat pipe on my carburetor.


Scottio
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Re: Interesting tinny sound at startup

Post by Scottio » Sun Jun 16, 2019 10:54 pm

Exhaust leak? As the engine warms up and metals expand the leak seals. Just a thought.

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Re: Interesting tinny sound at startup

Post by kmatt » Sun Jun 16, 2019 11:11 pm

This is another long shot, but because your car was fine before the U and J carburetor change, try checking the rod from the bell crank to the carb. It is at a different angle now and may need some tightening at the carb or bell crank. When car is warm it is in a different position, so no noise.


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Re: Interesting tinny sound at startup

Post by HaroldRJr » Mon Jun 17, 2019 12:28 am

Make sure the bendix cover is not coming loose! (....altho' that should also cause an oil leak,..???)


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Re: Interesting tinny sound at startup

Post by George Hand » Mon Jun 17, 2019 8:40 am

I had a crankshaft pulley that was loose and made a noise that took awhile to find.


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Re: Interesting tinny sound at startup

Post by Rich Bingham » Mon Jun 17, 2019 2:24 pm

I've found through the past two years, my Model T runs better and quieter than ever. Meanwhile, the audiologist claims I have increased hearing loss. I refuse to believe there's any connection hear (!) Bad noises get worse and louder . . . inconsequential noises that go away, well, What ?? Me worry ?? :lol:
"Get a horse !"


FundyTides
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Re: Interesting tinny sound at startup

Post by FundyTides » Mon Jun 17, 2019 5:47 pm

Loose through bolt allowing baffles to rattle?


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Mark Osterman
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Re: Interesting tinny sound at startup

Post by Mark Osterman » Mon Jun 17, 2019 6:53 pm

Well ... not the throttle rod, crank pulley, fan pulley, bendix cover. The rod running through the muffler sounds plausible.

Have to do a dry plate photography shooting workshop in Letchworth Park (Grand Canyon of the East) starting tomorrow. So I’ll keep thinking about it while I’m out of contact with the civilized world and work on it this coming weekend when I get back.

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Re: Interesting tinny sound at startup

Post by Ruxstel24 » Mon Jun 17, 2019 7:40 pm

Can you tell if it's front or rear or middle ?
Your eat on a long screwdriver handle works like a stethoscope, you can move it around and see if you can pick up the area.

Could be a "loose nut behind the wheel" ! :lol:

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