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'52 8N Engine Noise

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Rick B (WA)

06-02-2003 09:34:51

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My '52 8N has an engine noise. Louder than a click, not as heavy as a knock. The "screwdriver in the ear" trick puts the source in the vicinity of the #2 exhaust valve guide. Tappet adjustment looked good, but I may have missed something. Runs good, good power.

Currently looking for work so a full rebuild is not possible, but we've got work to do and I don't want to do any damage.

Any ideas what to look for? Thanks, rick

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duey

06-02-2003 10:02:22

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Re: '52 8N Engine Noise in reply to Rick B (WA), 06-02-2003 09:34:51

My first thought is perhaps a *loose sleeve*. I may be on thin ice but my 46 has had a loose sleeve for a dozen years.... I may pay the price for ignoring it..... You'll need the head off to confirm, tho. duey

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Evil Steve

06-02-2003 09:47:55

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Re: '52 8N Engine Noise in reply to Rick B (WA), 06-02-2003 09:34:51

Pull the plug off #2 while engine is running. If that lessens the sound, it will help confirm #2 as source of problem.

Now, the best way to isolate is to perform a dry then wet compression test. This will help eliminate or identify a sticking valve as culprit. HOWEVER, since you don't report hearing any sputtering or after/back fire, I wouldn't suspect valve.

If not a valve, there are only 3 things I can think of that would produce a similer sound in that area of your engine:

1) Rod or main bearing starting to develop a problem. You MIGHT be able to isolate this by running 50wt oil in there and if it DOES eliminate the knock/tick then you outta be using heavier oil anyway until you can fix the problem.

2) Piston slap.

3) Exhaust manifold leak (often mistaken for an internal engine problem).

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Rick B (8N) WA

06-02-2003 19:54:06

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Re: Re: '52 8N Engine Noise in reply to Evil Steve, 06-02-2003 09:47:55

Thanks for the information. I have recently replaced the manifold and exhaust pipe. (The new replacement muffler is sure a noisy thing). I'll do a compression check and try heavier oil.

What is the cure for piston slap and is there a way to isolate that as the problem? Thanks again.

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Hobo,NC

06-02-2003 10:08:16

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Re: Re: '52 8N Engine Noise in reply to Evil Steve, 06-02-2003 09:47:55

For # 3 the best way to find exhaust leak is to take a few feet or more of rubber hose I use a 6 ft piece of old 3/8 air line and put one end up to your ear and move the other end around the manifold. It will pin point a exhaust leak.

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Rob N VA

06-02-2003 11:11:55

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Re: Re: Re: '52 8N Engine Noise in reply to Hobo,NC, 06-02-2003 10:08:16

My dad showed me a trick for locating an exhaust leak once. It was with his old 66 Chevy Bel-air. The exhaust was rumbling and he couldn't find out where by looking at the pipe so....he took me all over town and stopped at a store and got some transmision fluid, then he got up on the highway and ran it real hard and pulled off at a parking lot and poured the transmision fluid down the carb. She smoked like a chimney out the exhaust pipe, and of course you could see the smoke comming out of the leak too! Of course this may harm your plugs irrevocably, and goof up your carb, but it did work. Then again, Dad liked to drink a lot too, so take this with a grain of salt

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Mountainman

06-02-2003 19:32:48

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Re: Re: Re: Re: '52 8N Engine Noise in reply to Rob N VA, 06-02-2003 11:11:55

As long as you don't stall out the engine while pouring transmission fluid through it, you will just burn off any excess carbon build up - won't hurt a thing. Oh, unless you are a mosquito that is.

N - joy.

Mountainman...CA

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