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Ford 9N, 2N & 8N Discussion Forum
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Re: update on 2n with scary noise

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Author  [Modern View]

02-01-2013 13:51:34

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Do you know for a fact that the valves are working in that cylinder?? You can have compression but also have one valve that does not open and if so it could be why it is not running on that cylinder

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02-01-2013 14:20:23

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 Re: update on 2n with scary noise in reply to old, 02-01-2013 13:51:34  
With engine running,valve covers off,I can see the tappets rising with the cam lobes,making contact with the bottom of valve stem and raising the valves. I can also see the valves rising when veiwed through plug hole and hand cranking the engine.I'm leaning towards this being a valve issue but just don't know how I get 95lbs, compression if the valves are bad.

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02-01-2013 14:56:13

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 Re: update on 2n with scary noise in reply to BigDanT, 02-01-2013 14:20:23  
Get the #4 cylinder on a compression stroke both valves closed then fill that cylinder with ATF. Watch for ATF to leak out the carb or the exhaust. If it does then you know which valve it is that might be the problem. If it is a valve problem that is. Could also be the intake or exhaust port clogged in the block

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02-01-2013 15:11:45

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 Re: update on 2n with scary noise in reply to old, 02-01-2013 14:56:13  
Quoting Removed, click Modern View to seeDid Dan check tappet clearance on #4 or just #3? If ex too tight & not completely closing, that could dilute mixture enough to not fire.

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02-01-2013 15:52:26

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 Re: update on 2n with scary noise in reply to JMOR, 02-01-2013 15:11:45  
Jmor...yeah that was one of the first things I checked after start up...all tappet clearance checked good.
Going to try Old's suggestion with ATF,maybe one just ain't seating right??? Also going to try pressure testing radiator..thinking maybe an internal head gasket leak,no signs of it though???Thanks

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02-01-2013 15:45:51

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 Re: update on 2n with scary noise in reply to JMOR, 02-01-2013 15:11:45  
Not sure if he did or did not but filling the cylinder with ATF would tell him if it was a valve problem and yes I agree with you just another way to find a valve that does not close all the way

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02-01-2013 14:40:23

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 Re: update on 2n with scary noise in reply to BigDanT, 02-01-2013 14:20:23  
Go back to Pogun's idea and feel for compression and or vacuum that will tell you if you have enough to get some power out of that cyclinder. Then it is back to spark issues. Could you have enough carbon around the valves to prevent fuel from entering and or exhaust from leaving?? A wet plug will indicate fuel entering but if your exhaust aint leaving you have a nogo.

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