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Ford 9N, 2N & 8N Discussion Forum
:

Slapping noise when under load

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Philco

05-14-2020 21:29:45




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I don't want to sound like a broken record, but I cannot find my original inquiry, and I was not notified when people are responding to my questions. I will respectfully ask again. zMy 1951 Ford 8N is very quiet when in idle. But as soon as I put a load on it like pulling a mowing deck, the tractor sounds like a leather belt slapping against eachother. What causes this noise?




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Caryc

05-29-2020 09:43:23




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 Re: Slapping noise when under load in reply to Philco, 05-14-2020 21:29:45  
Quoting Removed, click Modern View to see

I'm not saying that this is your problem but it could be leaking there. No type of gasket or sealer is needed at that point if you install the exhaust pipe and muffler correctly.
The way I installed mine is to put the pipe up to the exhaust flange and see how it fits. A little gentle bending of the pipe might be necessary to get it as close as you can to a good straight fit. When that fit is good as you can get it, place the pipe back up there and place a piece of wood with a bottle jack under it so it's holding it up there. Use the jack and put some pressure it. You may need to take a ball peen hammer and do a little tapping on the flange to get it looking better. Once you get that done, it's time for the clamp. The clamp has a correct way and a wrong way to install it. You want to install it with the larger of the inside flanges on the bottom. If you follow this procedure, you should get a good installation with no leaks.

I learned this from one of the old timers here. There is a wealth of knowledge in the guys here.
I would think that your aluminum foil could maybe burn out of there over time.

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Btzj02

05-27-2020 08:44:02




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 Re: Slapping noise when under load in reply to Philco, 05-14-2020 21:29:45  
quiet when in idle. But as soon as I put a load on it like pulling a mowing deck, the tractor sounds like a leather belt slapping against eachother. What causes this noise?[/quote]

Philco

Did you find a cause and solution for this? Interesting problem!



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lha

05-16-2020 08:42:27




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 Re: Slapping noise when under load in reply to Philco, 05-14-2020 21:29:45  
Quoting Removed, click Modern View to see Bruce[Va] had a good idea concerning the manifold some time ago involving high temp epoxy. You might find it in the archives. Bruce may read this and include a link to the article.



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Caryc

05-16-2020 07:36:34




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 Re: Slapping noise when under load in reply to Philco, 05-14-2020 21:29:45  
If you do find that it's the manifold leaking, I would cease using the tractor and repair it right away. That exhaust leak could be not only eroding the manifold but the engine block face itself.



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Btzj02

05-16-2020 06:41:38




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 Re: Slapping noise when under load in reply to Philco, 05-14-2020 21:29:45  
I agree with Abbby. Engine or drive train? I had a stuck hydraulic pump valve that had a rhythmic noise to it and it got worse the heavier the load was on the 3 point.



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Caryc

05-15-2020 10:53:20




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 Re: Slapping noise when under load in reply to Philco, 05-14-2020 21:29:45  
Sometimes a machanics stethoscope comes in very handy for noises. Stick around #4.



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Mad Farmer

05-15-2020 09:12:33




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 Re: Slapping noise when under load in reply to Philco, 05-14-2020 21:29:45  
I had a combination of leaky #4 ex on manifold and tappets that previous owner never adjusted.

Lots easier to do tappers with ex manifold off. Smooth as a sewing machine now.

"Slapping" I think of 2-stroke dirt bikes and chain saws with too much piston clearance.



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Dean

05-15-2020 08:51:53




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 Re: Slapping noise when under load in reply to Philco, 05-14-2020 21:29:45  
Noises cannot be diagnosed in a chat forum.

That said, I would suggest that you verify proper ignition at all 4 spark plugs before doing anything else.

Dean



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Philco

05-26-2020 06:42:31




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 Re: Slapping noise when under load in reply to Dean, 05-15-2020 08:51:53  
Hello Guys,

Re.: Slapping noise when tractor under load. I will check for proper ignition, and maybe put a timing light to test it. But that tractor runs so great and starts up like electronic ignition with no hesitation. I gotta pipe I can use as a stethascope to hear internal noises near the # 4 cylinder. And I'll check for exhaust leaks where both pipes join together. I bought new exhaust pipe several years ago, and used aluminum foil as a gasket to seal that joint better, so perhaps it may be coming from there. I retorqued the head last night since I just installed a new head gasket because of water leaking into the #2 cylinder and a lot of antifreeze in the oil, and changed that aloong w/ filter. I'll check the hydralic pump valve for noises there too. I'll let you guys know what I find. Thanks for all your input; it's appreciated.

Lastly, how do I switch the forum to Modern View...can't find it?

Thanks!

Philco

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Caryc

05-15-2020 07:24:46




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 Re: Slapping noise when under load in reply to Philco, 05-14-2020 21:29:45  
Quoting Removed, click Modern View to see

I would second that guess. When mine was leaking, it sounded like a ticking noise but I guess some could say it sounded like a slapping belt. I could even feel the compression coming out around number four cylinder with my finger.



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neverfear

05-15-2020 04:41:01




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 Re: Slapping noise when under load in reply to Philco, 05-14-2020 21:29:45  
Wild guess. Look around the exhaust manifold for leaks where it bolts to the engine.



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Abbby

05-15-2020 04:03:09




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 Re: Slapping noise when under load in reply to Philco, 05-14-2020 21:29:45  
Can we get some more details. Is it coming from the engine or drive train? Do you have good oil pressure? Maybe you could upload a sound track of it?



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