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Old 03-20-2017, 08:23 PM   #1
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Default oil on spark plugs

Been battling this issue to no avail, I am constantly getting oil on my spark plugs threads and on number 2 cylinder will foul out the plug to where it wont even fire. I am running a prc 260 ls3 head and I have rtv the rocker bolt holes. I have no idea where the oil is coming from. Didn't have this issue until these heads ? Any advise. The motor does use oil but does not leak, going to do a leak down test this weekend. After an hour driving all the plugs are burning good except one and all have oil on the threads.
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Old 03-20-2017, 08:42 PM   #2
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Valve seals/guides....
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Old 03-20-2017, 08:44 PM   #3
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The heads have less than 5,000 miles but I have noticed this problem since day 1.
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Old 03-20-2017, 08:47 PM   #4
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Make sure the valve seals were correctly installed. Even new they will fail if not done correctly.
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Old 03-20-2017, 08:51 PM   #5
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Would of been straight from tsp, but I will check. Will a leak down test help confirm this ?
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Old 03-20-2017, 08:55 PM   #6
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Probably not if the valves seal well.
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Old 03-21-2017, 08:18 PM   #7
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It would have to be more than just a valve seal to foul a plug.
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Old 03-21-2017, 08:40 PM   #8
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Quote:
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Valve seals/guides....

First item to check, it was the issue on my engine after new valve seals installed, 3 did pop-up
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Old 03-21-2017, 09:27 PM   #9
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Going to check this weekend all plugs have wet threads however only cylinder two will foul out
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Old 04-09-2017, 10:58 AM   #10
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Little update.... replaced valve seals but the issue is still there. Compression on all cylinder is within 10psi. I'm kind of lost as to what could be doing this just to one cylinder.
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Old 04-10-2017, 10:04 PM   #11
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Well without scoping the cylinders I can suggest a few things. 1st would be carbon pasted rings, second broken rings or ring lands. Like I said above noway valves seals would cause a oil fouled plug. When number 7 in one of my LS1 cars was fouled the piston was broken. I'd rent or buy a cheap camera scope and take a peek.
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Old 04-11-2017, 07:20 AM   #12
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Well without scoping the cylinders I can suggest a few things. 1st would be carbon pasted rings, second broken rings or ring lands. Like I said above noway valves seals would cause a oil fouled plug. When number 7 in one of my LS1 cars was fouled the piston was broken. I'd rent or buy a cheap camera scope and take a peek.
Was compression ok ?
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Old 04-11-2017, 11:03 AM   #13
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Leak down test could tell you more I would think...
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Old 04-11-2017, 06:55 PM   #14
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Was compression ok ?
Yes it was....real pain in the azz.
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Old 04-11-2017, 07:12 PM   #15
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I was running into the same issues with my build. New build with PRC 265cc heads and kept oiling down the back cylinders and burning oil out the tail pipes once you reached operating temp. Been told to put sealant on rocker bolts that wasn't it. Guides, seals, rings all culprits but after checking compression and leak down tests it turns out I was just getting way too much oil into the intake so my question to you is how is your PCV system setup
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Old 04-11-2017, 07:27 PM   #16
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He is having a issue with no 2 cylinder, I seriously doubt its pcv related.
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Old 04-12-2017, 06:35 AM   #17
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I run a catch can so that wasn't my issue it ended up being a cracked piston. Not sure how I cracked a wiseco forged piston but I am going to pull it apart and see.
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Old 04-12-2017, 06:48 AM   #18
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Bunch of things can crack um but the most likely culprit is not enough ring end gap. Ring expands and has to go someplace, ends up cracking the piston. I'd probably check the injector and inspect the intake seal in that area. Cylinder may have been running on the lean side. Also check the rod bearing for signs of detonation.Good Luck

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Old 04-12-2017, 07:23 AM   #19
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Appears there is a small circle and the cracks proceed from that. not sure if something hit the piston.
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Old 04-12-2017, 10:57 AM   #20
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Appears there is a small circle and the cracks proceed from that. not sure if something hit the piston.
Maybe the piston is contacting the head? What's your piston-to-head clearance? Also, piston-to-valve clearance?
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