Oil on spark plug threads


Information and questions on GL1100 Goldwings (1980-1983)
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glasshead
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Oil on spark plug threads

Postby glasshead » Mon Sep 30, 2013 5:47 pm



I looked in the archives but did not find the answer.
I am changing out my spark plug wires. I checked the plugs (actually only #1 so far because I haven't ordered the wires yet). It looked good around the post (electrode?) and inside. But the threads were coated with oil all the way to the crush washer. Is that normal or a sign of something?



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Re: Oil on spark plug threads

Postby WingAdmin » Mon Sep 30, 2013 8:27 pm

Oil on the plug is usually leaky, worn valve guides, although it can also be worn rings. A compression and leakdown test will tell you for sure.

Have a look at How to "read" used spark plugs

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glasshead
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Re: Oil on spark plug threads

Postby glasshead » Tue Oct 01, 2013 8:43 pm

I looked at the "how to read the plugs" post before. Mine looks just like the normal one. The oil is on the threads only.

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Re: Oil on spark plug threads

Postby WingAdmin » Tue Oct 01, 2013 10:08 pm

glasshead wrote:I looked at the "how to read the plugs" post before. Mine looks just like the normal one. The oil is on the threads only.


Is there oil in the plug well, that might have gotten on the threads when you removed it?

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Re: Oil on spark plug threads

Postby glasshead » Wed Oct 02, 2013 5:52 pm

Nope. Oil well clean. I just pulled the other 3 plugs. There was some oil on all of the threads, but they weren't saturated like the one from no. 1 cylinder. All 4 plugs were dry on the inside and gapped correctly. Every cylinder had a little coating of dried oil right at the base, where the crush washer contacts the head. I looked down the spark plug holes with a flashlight. The tops of the pistons were somewhere between black and grey. Closer to grey than black. They looked a little rough, as in not smooth, but didn't look pitted.
I would check the compression, but I don't have the correct size adapter for my gague. I can't find any place that sells just the adapters, and I hate to buy a whole new compression gague just to get the adapter. But I may have to. Right after ( or before), I break down and buy a vacuum gague set to synch the carbs.
Thanx for responding. You guys have gotten me through rebuilding brakes AND changing my timming belts without a hitch. This seems like small potatoes, but it's a " I just need to know what it is" thing.

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Re: Oil on spark plug threads

Postby RATWING-86 » Thu Oct 03, 2013 6:53 am

That brings up a question.......................can valve seals be changed in chassis using a air-hold setup from the plug hole? Also, is there an umbrella style seal available that utilizes the same valve stem size as the GL 1200? I haven't looked into that yet. I've only just started my bike (after a 12 year sleep) so I'm not sure WHAT I'm going to find once it's roadworthy.
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Re: Oil on spark plug threads

Postby WingAdmin » Thu Oct 03, 2013 11:46 am

RATWING-86 wrote:That brings up a question.......................can valve seals be changed in chassis using a air-hold setup from the plug hole? Also, is there an umbrella style seal available that utilizes the same valve stem size as the GL 1200? I haven't looked into that yet. I've only just started my bike (after a 12 year sleep) so I'm not sure WHAT I'm going to find once it's roadworthy.


Yes. Another method is to take some soft rope, feed it into the cylinder through the plug hole, then rotate the engine so that the piston pushes the rope up against the valve, holding it in place while you remove the springs and change the seats. Once done, rotate the piston away, and pull the rope out the plug hole.

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Re: Oil on spark plug threads

Postby redbug » Sun Oct 06, 2013 11:21 am

I have read with much interest on this thread on the oil on the threads up to the sealing washer,I typed in on search oil on spark plug threads and ehow a site popped up,plus others.And it was referring to overhead cam engines,thats us,and the first thing it said was change the valve cover gaskets (huh?) and it went on to further detail about oil galleys getting clogged restricting oil flow allowing it to stay up in the head and getting trapped and with the hot cold expansion of the head it will seep into the threads.Plus the sparkplug drain holes being clogged which I read here,mositure etc will go to the threads.I do not know how to post,paste.paint,the site to here.I will learn .I hope this was of some help to you as I enjoy the tech how to's and whys.Its kinda like reading Kevin Camerons column,I don't really know what you said,but I sure like it.
" Ridin on Tulsa Time "

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Re: Oil on spark plug threads

Postby RBGERSON » Mon Oct 07, 2013 7:57 am

You can make an adapter from an old spark plug..knock out the center..the top etc. and you are left with the threads and the nut end of the plug... tap what's left to match the adapter you have..add an o ring screw them together and there you go.
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Re: Oil on spark plug threads

Postby glasshead » Mon Oct 07, 2013 7:19 pm

Thanx. Good info. I just remembered that my niece's boyfriend is a Harley mechanic, (not held against him :lol: ). He said I could just go down to his shop and we could check compression there.

As far as oil on threads.... changing the valve seals sounds like a pretty easy job.??




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