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Re: Spark Plug In J-Head Question
[Re: scratchnfotraction]
#1321147
10/24/12 04:03 PM
10/24/12 04:03 PM
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Joined: Jan 2003
Posts: 5,446
Indiana
YO7_A66
OP
master
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OP
master
Joined: Jan 2003
Posts: 5,446
Indiana
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I was talking to a racer friend of mine and he brought up an interesting thought. "If" the hex on the plug is bottoming out on the chamfer of the head, then the spark plug seal may not be sealing up. Since I do not drive the car very much, the moisture (not oil) may be pushing up and out of the cylinder thru the plug seal and puddling at the bottom of the spark plug. The fluid that I am finding puddling up around the plug is dark in color, so it could be moisture (not oil) that has been sitting on the piston which does have a dark coating (carbon?).
I am going to use a paint marker, and paint the chamfer around that plug. Then after it dries, torque the spark plug back into the hole and then remove it to see if any of the paint marker has been scratched off of the chamfer. If it has been scratched off, then I will add a second plug gasket from one of my new plugs that I have sitting around. If there is no scratches, then I will add powder down and around the plug and then fire it up to see if I can find the issue.
The plugs do not show oil. They have some dark color on the threads but no oil.
I do have a "ticking" exhaust leak that I have not found yet, even after a new set of header gaskets and tracing each exhaust joint. Maybe this is my "ticking" leak.
Thanks Scratch!
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Re: Spark Plug In J-Head Question
[Re: YO7_A66]
#1321148
10/24/12 04:49 PM
10/24/12 04:49 PM
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Joined: May 2003
Posts: 15,487
Florida
scratchnfotraction
I Live Here
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I Live Here
Joined: May 2003
Posts: 15,487
Florida
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do you know if any of the spark plug holes have been repaired or rethreded? that sounds like it would work with the marker and scratching it. if it does or does not,pick up 1 autolite 65 plug and try it.  does the heads have air injection holes drilled in the heads? are the holes pluged if so? header gaskets/flanges will not seal those off and are a exhaust leak that will have you going nuts looking for it. some of the j heads have the hump in the port and mached area at the flange but are not drilled. ( I chased a rocker/lifter tick for a long time till I found the one injection hole open.
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Re: Spark Plug In J-Head Question
[Re: YO7_A66]
#1321149
10/24/12 05:17 PM
10/24/12 05:17 PM
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Joined: May 2003
Posts: 15,487
Florida
scratchnfotraction
I Live Here
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I Live Here
Joined: May 2003
Posts: 15,487
Florida
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Quote:
I was talking to a racer friend of mine and he brought up an interesting thought. "If" the hex on the plug is bottoming out on the chamfer of the head, then the spark plug seal may not be sealing up. Since I do not drive the car very much, the moisture (not oil) may be pushing up and out of the cylinder thru the plug seal and puddling at the bottom of the spark plug. The fluid that I am finding puddling up around the plug is dark in color, so it could be moisture (not oil) that has been sitting on the piston which does have a dark coating (carbon?).
I am going to use a paint marker, and paint the chamfer around that plug. Then after it dries, torque the spark plug back into the hole and then remove it to see if any of the paint marker has been scratched off of the chamfer. If it has been scratched off, then I will add a second plug gasket from one of my new plugs that I have sitting around. If there is no scratches, then I will add powder down and around the plug and then fire it up to see if I can find the issue.
The plugs do not show oil. They have some dark color on the threads but no oil.
I do have a "ticking" exhaust leak that I have not found yet, even after a new set of header gaskets and tracing each exhaust joint. Maybe this is my "ticking" leak.
Thanks Scratch!
well which one is it now? oil or the airfuel mixture/condisation?
he may have nailed it for you right there. the plug not sealing may indeed be the problem. 
ez mistake on calling the puddle oil and not a fuel/water mixture. 
very interesting!
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Re: Spark Plug In J-Head Question
[Re: scratchnfotraction]
#1321150
10/24/12 08:35 PM
10/24/12 08:35 PM
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Joined: Jan 2003
Posts: 5,446
Indiana
YO7_A66
OP
master
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OP
master
Joined: Jan 2003
Posts: 5,446
Indiana
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I tested the paint idea and there were no scratches on the chamfer. I did add a second washer to the existing plug and now I need to test the powder.
There were no signs of oil on the valve cover above the spark plug. Next I will start it up with the powder and with the second seal washer to see what I can find.
1970 YO7 A66 [Canadian Export] F8 Challenger
340 (Currently in shop for stroker assy.)
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Re: Spark Plug In J-Head Question
[Re: YO7_A66]
#1321151
10/24/12 08:53 PM
10/24/12 08:53 PM
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Joined: Jan 2003
Posts: 5,446
Indiana
YO7_A66
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OP
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Joined: Jan 2003
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Indiana
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None of the holes look to have been repaired. This is the #7 hole that is in question.
1970 YO7 A66 [Canadian Export] F8 Challenger
340 (Currently in shop for stroker assy.)
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Re: Spark Plug In J-Head Question
[Re: scratchnfotraction]
#1321152
10/24/12 09:02 PM
10/24/12 09:02 PM
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Joined: Jan 2003
Posts: 5,446
Indiana
YO7_A66
OP
master
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OP
master
Joined: Jan 2003
Posts: 5,446
Indiana
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""does the heads have air injection holes drilled in the heads?""
I am not sure what this means, so I have attached a photo of the heads before I bolted them on about 6 years ago. They were rebuilt and the bowls were blended.
1970 YO7 A66 [Canadian Export] F8 Challenger
340 (Currently in shop for stroker assy.)
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Re: Spark Plug In J-Head Question
[Re: Cab_Burge]
#1321155
10/25/12 05:06 AM
10/25/12 05:06 AM
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Joined: May 2003
Posts: 15,487
Florida
scratchnfotraction
I Live Here
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I Live Here
Joined: May 2003
Posts: 15,487
Florida
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Quote:
Quote:
""does the heads have air injection holes drilled in the heads?""
I am not sure what this means, so I have attached a photo of the heads before I bolted them on about 6 years ago. They were rebuilt and the bowls were blended.
I don't think any of the J heads ever had air injection holes machine into them from the factory  The air pumps would pump air into the exhaust ports from the holes machined into the heads for that, your heads don't have the holes
no holes in those heads.
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