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Started By
Message
OB Mechanics, let's see if you can figure this out.
Posted on 9/12/14 at 4:56 pm
Posted on 9/12/14 at 4:56 pm
This spark plug was somewhat seized, took an overnight soak in Kroil and careful use of a breaker bar to work it out without taking the threads in the aluminum cylinder head with it. Little bit of oil puddled around the base of the plug, either from a slight leak in the valve cover gasket or a little spillage while changing oil. I always use anti-seize when doing plugs and some was still visible in the plug threads.
ETA: This set of plugs were put in about a year ago.
One side looks fine.
Other side that faces the ground strap of the electrode.
That little area shows erosion (not corrosion) from the plug base. I have my theories on why this happened but like to see if the OB can guess too.
ETA: This set of plugs were put in about a year ago.
One side looks fine.
Other side that faces the ground strap of the electrode.
That little area shows erosion (not corrosion) from the plug base. I have my theories on why this happened but like to see if the OB can guess too.
This post was edited on 9/12/14 at 5:02 pm
2
Posted on 9/12/14 at 6:01 pm to Clames
My guess is you have a bad ground strap on the engine causing the spark plug to arc.
Posted on 9/12/14 at 6:17 pm to hogdaddy
Not consistent with arcing. Truck has ground straps aplenty too. Full arcing would also ground out the spark to the point the cylinder would misfire or not fire at all, this engine ran perfectly fine and I only pulled these plugs as part of the maintenance I do prior to the winter up here.
Posted on 9/12/14 at 6:59 pm to Clames
Dielectric grease blob on one side?
Posted on 9/12/14 at 7:23 pm to DonChowder
No, but not enough dielectric grease is probably a good part of the problem. That little pouch they gin off on you at the parts store is nowhere near enough though. Think what happened here is a combination of a little oil pooling around the base of the plug creating enough oil vapor to form an channel for a corona discharge to happen where not enough DG was applied to stop it from reaching the base. Very localized and basically created enough eroded material to lock up the plug a bit. The plug boots on this truck really don't cover all of the insulator so I really need to coat the insulator at the base in addition to putting some in the boot.
Posted on 9/12/14 at 7:31 pm to Clames
quote:
corona discharge
There's your problem it's a Mexican truck
Posted on 9/12/14 at 7:47 pm to Clames
quote:
a corona discharge
Congrats on making me feel wee todd did. What the hell is that?
I got a D in circuits class.
Posted on 9/12/14 at 8:13 pm to DonChowder
Basically when a fluid (oil vapor in this case) created a zone of ionization around the spark plug. The portion of the electrical energy from the ignition system bypasses the electrode and goes into this zone. Usually evidenced by a brown ring around the bottom of the insulator where oil vapor has been deposited. Not exactly enough to cause an arc but kinda forms a cloud of plasma.
Posted on 9/12/14 at 11:28 pm to Clames
Wellllllll....
For all in tents and porpoises, arc=plasma
A simple explanation could be that it was a faulty plug and that the shortest path to ground was through that part of the nut instead of through the electrode and back to the threads.
Proof that never seize is not the miracle-no-matter-what-it's-gonna-come-off compound people sometimes think it is.
Electricity>whatever you put there.
For all in tents and porpoises, arc=plasma
A simple explanation could be that it was a faulty plug and that the shortest path to ground was through that part of the nut instead of through the electrode and back to the threads.
Proof that never seize is not the miracle-no-matter-what-it's-gonna-come-off compound people sometimes think it is.
Electricity>whatever you put there.
Posted on 9/13/14 at 12:20 am to DownshiftAndFloorIt
Corona discharge != arc
If the plug was that faulty then I would have gotten misfire codes or noticed rough idle or something. Truck ran perfectly fine. The area in question had nothing to do with, or without, anti-seize since that was only applied to the threads as per the manufacturer's recommendation.
If the plug was that faulty then I would have gotten misfire codes or noticed rough idle or something. Truck ran perfectly fine. The area in question had nothing to do with, or without, anti-seize since that was only applied to the threads as per the manufacturer's recommendation.
Posted on 9/13/14 at 9:36 am to Clames
How old are the plug wires in that vehicle? Original set?
Posted on 9/13/14 at 9:46 am to VetteGuy
About a year old. Changed them with that set of plugs.
This post was edited on 9/13/14 at 9:48 am
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