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Low Copmression / Bent Spark Plug

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Old 08-07-2017, 05:33 PM
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Low Copmression / Bent Spark Plug

I rescued this 78 F250 400 from the woods. The land owner said it had been used every once in a while and had a rebuild about 60k ago. I replaced the plugs, wires, cap, oil, oil filter, and rebuilt the carb. It was running okay. A little bit of a shimmy to it. Note #7 wasn't bent with original plug.

1) #6, is that a bad valve or rings? What step is next in testing/fixing?

2) #7 plug, wrong size plugs?

Thanks!



 
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Old 08-07-2017, 06:59 PM
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I may have found the issue
 
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Old 08-07-2017, 08:50 PM
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I believe you have found part of the illness.

Looks like #6 intake has been like that fer a spell....note the crusties on the pushrod tip. Also, it seems to be some kind of floaters around the bottom of that same valve spring?

#7 plug....careless install...? Wrong gap fer sure.....hehe. And, what's with the goober snot around plug #4? Sorta looks like that there JB Weld junk....?
 
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Old 08-12-2017, 01:25 PM
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Possibly debris in combustion chamber on #4, doesn't look like a broke or bent valve. What plug number are those? I run Autolite #25 unless spraying nitrous
 
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