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Has anyone ever seen this?  Rate Topic 
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 Posted: 01-31-2007 10:46 pm
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flatlanderep
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Anyone ever see oil bubbling from a spark plug?
Its just kind of seeping out it seems.
Any ideas?

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 Posted: 01-31-2007 10:55 pm
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Ron Earp
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Cracked insulator/body on the plug, or bad threads on head/plug.

Ron

Last edited on 01-31-2007 10:56 pm by Ron Earp

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 Posted: 01-31-2007 11:03 pm
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Mark Rosenbaum
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What Ron said.  It could also be watery oil, or oily water, leaking into the plug cavity of the head, and boiling due to the heat.

The quickest way to tell might be to swap plugs between two adjacent cylinders and see if the problem moves, or stays put. 

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 Posted: 02-01-2007 12:06 am
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flatlanderep
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Alright thanks for the advice....

I recently used one of those tapping bits to help clean out the threads because the spark plug wouldn't go in right. I'm hoping that its just the spark plug threads....and not the block.

I'll check a little bit later and update.

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 Posted: 02-01-2007 02:18 am
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Ron Earp
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Well, the plug threads into the head so it isn't the block. But, given you said it had trouble threading in it is probably the head. Good thing is that they are accessible and you can probably helicoil it.

R

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 Posted: 02-01-2007 02:55 am
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flatlanderep
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Ah, that sucks...I was hoping it was just gonna be the spark plug. I'm going to check it tomorrow. I'm too cold to venture outside right now.
in the mean time...whats the procedure for helicoil?

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 Posted: 02-01-2007 03:21 am
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jcdean
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http://www.emhart.com/products/helicoil.asp?gclid=CJmsmuSojIoCFQlQWAod2XLtoQ

Joey

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 Posted: 02-01-2007 12:19 pm
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Judson Manning
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I wouldn't even consider the Helicoil at this point.  What you have is a minor leak, and in the grand scheme of things, it's not that big a deal.  Fixing it IS a big deal!

The problem with the helicoil solution is that you have to pull the head off to do it.  That invokes the famous "while you are at it" clause of automtive repair.  I would wait to repair that thread when you are preparred to do a complete upper end rebuild.  Until then it shouldn't cause you too much grief.  Try installing a new plug with some anti-sieze compound on the threads, but be careful to not over-tighten when installing. 

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 Posted: 02-01-2007 02:17 pm
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John Young
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Try this site .

http://www.timesert.com

Regards, John

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 Posted: 02-02-2007 10:06 am
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normv
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The plug actually seals on the washer not via the threads, so unless it is majiorly cross threaded it is not the tread . Just change the plug, they generally leak up the edge of the insulator , incidentally I have 2 that do that on my one of my engines after I wash it down and they are still there, as Judson says don't worry about it, unless it is like a volcano. You often see plugs with a brown mark around the bottom of the insulator when you are replacing them from this type of leakage, I would be more concerned about the oil leak fro the rocker cover that is putting the oil there to allow you to see the bubbles. I know this is probably only a small one, it is a Jensen after all.

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 Posted: 02-02-2007 11:47 am
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Ron Earp
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Have to agree with Judson on that one, once the head is off........

You can also try a spark plug tap and use grease on the tap to catch any shavings that the tap removes. Might clean up damaged threads enough to do the job, if you have damaged threads.  Vacuum a lot with a probe to catch any small pieces that escape from the grease.

We used some time serts last year on a damaged head with good effect, however, it was in non-through bolt rocker arm holes. I think Ford is using a similar fix on the Triton V8 engines with only four spark plug threads that were produced incorrectly. They are doing it on the car as far as I know and it is working for affected owners.

R

Last edited on 02-02-2007 11:49 am by Ron Earp

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