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Valve problem?

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ray mccarty

02-25-2001 20:06:40




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I have an early 1947 8n ford. Engine was rebuilt a few years ago and has been running great. I am no mechanic but do understand just enough to get into trouble. My problem -- Just recently, the front spark plug is being crimped almost closed. Pulled spark plug and replaced. Same thing happened again as soon as the engine was cranked. Is this a problem with the valve out of adjustment or something much more serious. Would appreciate any guidance on this problem.

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Joel (SoCal 44's)

02-25-2001 21:48:45




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 Re: valve problem? in reply to ray mccarty, 02-25-2001 20:06:40  
Just looked at an 8N head and the plug lies between the valves and is NOT over the piston. Can't figure what would cause a crimp. Large chunk of carbon flying around in the cylinder somehow being pushed into the plug by the piston???

Strange



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Roland Jackson

02-25-2001 21:04:13




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 Re: valve problem? in reply to ray mccarty, 02-25-2001 20:06:40  
I think George is right about the piston mashing the spark plug end. I had a 8N once with the same problem. I fixed it with (I hate to say this out loud) spark plug extenders. I used the tractor for years that way. Hope this is helpful...



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Duane

02-25-2001 20:41:01




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 Re: valve problem? in reply to ray mccarty, 02-25-2001 20:06:40  
If you have'nt heard any knocking from the engine,
I would have to lean towards carbon build up in the combustion chamber. or somthing got sucked through the carb. Im sure that someone here has had this problem before with a N. I have had it happen to small engines and cars. With a car engine I use water to bust up the carbon.Not what I would reccomend for a beginer. On small engines
its easy to remove the head and clean. Wait for more responses Im sure one of the resident gurus
will have a better idea. Good luck.Duane

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Old George

02-25-2001 20:37:39




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 Re: valve problem? in reply to ray mccarty, 02-25-2001 20:06:40  
Ray, sounds like the piston is coming in contact with the tip of the plug, maybe due to taking to much off the head when resurfacing during rebuild. Valve adjustment should have no effect on that. Make sure you have the correct plugs and check the archives for some interesting ways to determine if contact is being made.. I think someone mentioned using a thin layer of modeling clay and turning the engine over by hand. A fix short of a new head might be using two(2) gaskets or a thicker one might help. Someone with more experience on this should coment shortly. Hope this helps.
Alan Esch
45 2N kit 183513

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Duane

02-25-2001 21:18:58




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 Re: Re: valve problem? in reply to Old George, 02-25-2001 20:37:39  
At the risk of sounding dumb,but wouldent it have done it from the start, not after a few years. Not trying to be a smart a**, just trying to understand? Thanks,Duane



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Old George/I stand corrected

02-26-2001 05:58:34




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 Re: Re: Re: valve problem? in reply to Duane, 02-25-2001 21:18:58  
Duane, you make a good point, I was just guessing based on previous comments I've read on this great board. Luckily for me I have not had experience with this problem in the past. Joel is correct from the look of this picture.
third party image

Incorrect valve adjustment may be the case, but too much may have taken off the head as well. I would check the valve adjustment by the problem plug first, also spring condition etc. before I pulled the head. FWIW, just trying to help.
Alan Esch
45 2N kit 183513

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Brad

02-25-2001 20:35:40




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 Re: valve problem? in reply to ray mccarty, 02-25-2001 20:06:40  
Could be carbon. You could pull the hood so you can get a line of sight down the sparkplug hole but I think I'd pull the head. It's not that hard to remove and you'll probably end up doing it anyway. These engines are flatheads, the valves are off to the side, nowhere near the plugs.



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Timk

02-26-2001 07:45:18




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 Re: Re: valve problem? in reply to Brad, 02-25-2001 20:35:40  
I agree. Why speculate ? Pull the head. If you don't, that "something" that's hitting the plug is going to get jammed somewhere else and you'll wind up blowing the engine. My $.02



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test

03-02-2001 04:37:17




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 Re: Re: Re: valve problem? in reply to Timk, 02-26-2001 07:45:18  
third party image

test



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