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Unread 01-14-2010, 03:46 PM   #1
Donobrew
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Pulled my plugs and!

So I pulled my plugs last night to take a look at them. What I saw was 5 of the 6 plugs were caked with ash/gray deposit on one side of the plug. The #6 plug looked “normal”.
I did some research on this and found out that either I’m using cheap gas, cheap oil and or I have an oil leak in the cylinders from worn valve guides or valve seals. I have notice that I add quart of oil right around the 3000 mile mark so when I’m down a quart I know its time for an oil change…

If it is worn valve guide/valve seals how difficult is that to replace?

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Unread 01-14-2010, 04:04 PM   #2
PERK
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how many miles on the engine? have you done a compression check?
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Unread 01-14-2010, 04:13 PM   #3
Donobrew
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Between 20-40k on this engine. I had the cam replaced about 10,000 ago and I believe the seals were replaced at that time too... I need to fine the receipt... You would think the mechanic would replace the valve seals...
I haven't checked the compression yet... What should it read?
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Unread 01-14-2010, 06:04 PM   #4
halpeters
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Put new plugs in - and don't get anything fancy - AC Delco plain plugs are perfect. Verify the plugs are the correct heat range and gap for your engine. Jeephammer has good suggestions on what to use.

Do a GOOD tuneup - again follow Jeephammers advice - use a GOOD cap and rotor with brass terminals and good wires. Check timing.

Run for 3000 miles and check the plugs again.

A quart of oil in 3000 miles is NOTHING.... A quart in 500 miles isn't really anything to worry about...

Remember, this is 1960's or older technology that we are running. Back then everything burned and leaked oil, and needed tune ups every 3000 to 12000 miles. Back then, the plugs you describe would have been cleaned, regapped, checked and reinstalled without a second thought...

This ain't "new HONDA drive it for 100,000 miles before doing anything" stuff....
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Unread 01-14-2010, 09:20 PM   #5
Thumperk15
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Grey? If it's not oily or wet looking it's not bad. Am I the only one that has posted here that pulls plugs and put them to my nose and simple take a sniff?Does it smell of gas(possible not adjusted carb), or oil(hopefully valve seals)? I'd do that first and if it's grey, burnt gas and exhaust look and smell.
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Unread 01-14-2010, 09:24 PM   #6
Thumperk15
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Would bad gas or cheap oil not cause the one plug to be normal looking and the other 5 be bad? Also, the majority of the time a engine goes it's the last # cylinder.
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Unread 01-15-2010, 06:48 AM   #7
Mike Romain
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You would be blowing a lot more than one quart of oil between changes if the seals were bad, I would suspect the gas additives and would be wondering why #6 wasn't firing right.

I sometimes test the spark plug wires by spray misting them with water in the dark. If any are leaky for spark it shows up nice. I would also be inspecting the inside of the distributor cap with a strong light at the #6 spark plug post looking for a spiderweb type mark.
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Unread 01-15-2010, 07:52 AM   #8
Thumperk15
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Water on the wire at night? If the nights were warm and I had time at night that sounds cool. I however simply take a screwdriver, stick inside, and lay it close to metal while holding the plastic handle, you should clearly see it jumping during the daylight.
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Unread 01-15-2010, 07:55 AM   #9
Thumperk15
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When I read #6 as being "normal" looking I see it as firing just fine, could be wrong though.
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Unread 01-15-2010, 10:24 AM   #10
Donobrew
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I had to hit the first 5 plugs with a wire wheel pretty good to clean them up. The #6 plug wasn’t nearly as bad as the others. I hit it with the wire wheel for a spilt second to clean it…
I’ll do an oil change and tune-up (new plugs, cap, rotor and wirers) and re-check the plugs in 3000 miles to see what they look like.

Mike, when you say “Fuel Additive” I’m not adding any to my fuel. Would it be from what the gas companies add to your fuel?

Troy
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Unread 01-15-2010, 03:12 PM   #11
Donobrew
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Its time for a tune-up! I last time I changed the plugs, wirers, cap/rotor was in July 08 when I did the TeamRush upgrade. Its been 18 months about 14,000 miles…
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Unread 01-15-2010, 03:40 PM   #12
swatson454
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I think Mike is referring to a procedure that can be used to test the wires themselves. When done like he mentioned, you can sometimes see the wires arcing all over the place. It's really neat if it's an automatic. You can have a buddy "power brake" it and watch the light show under the hood if the wires are bad.

Holley Carb Tuning
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Unread 01-15-2010, 06:51 PM   #13
scooter
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14K miles isnt a lot for plugs or anything else either tune up wiseand 3k per quart burned is pretty darn good,my old K5 burned a quart ever 300-400 miles and the plugs never fouled,gotta be some bunk gas ,weak spark or something else.
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Unread 01-16-2010, 06:06 AM   #14
Mike Romain
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Quote:
Originally Posted by donobrew View Post
Mike, when you say “Fuel Additive” I’m not adding any to my fuel. Would it be from what the gas companies add to your fuel?

Troy
Yes, you can't just buy 'gasoline' anymore.
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Unread 01-16-2010, 06:08 AM   #15
Mike Romain
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Quote:
Originally Posted by Thumperk15 View Post
Water on the wire at night? If the nights were warm and I had time at night that sounds cool. I however simply take a screwdriver, stick inside, and lay it close to metal while holding the plastic handle, you should clearly see it jumping during the daylight.
Yup, that shows you have spark and we figure the OP 'does' have spark. The mist of water is to find leaky wires. The light show can be wicked with bad wires.
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86/00 CJ7 Laredo, 33x9.5 BFG AT's, 'glass nose to tail in '00, 'New' frame,wires and plumbing in '09. Carter BBD Carbed 4.0 HO in '10.
89 YJ Renegade. BBD Carbed 4.0 HO. Locked front and rear with 33x9.5 BFG AT's
Some Canadian Bush Jeep Runs and Build Photos: http://mikeromainjeeptrips.shutterfly.com (10 new albums added Sept 16/10)
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