![]() ONLY one 5.7 hemi i changed the plugs on had next to nothing on the plugs and that car has never seen the throttle on the floor was a pussy foot. very well will end up with the same result in 30k miles. Tighten up the valve cover is all you can do-unless you want to change out the plug bore seal. It's just a little oil vapor that collects on the plug and around the plug bore-no big deal. Very commen on the last 2 plugs on passenger side on the 5.7.Įvery 5.7 i have changed the plugs on were like that. its blow by around the o rings on the valve cover. Also, you would want to change the oil before and after the BlueDevil procedure.Click to expand. Be sure to follow the guidelines for the proper amount to use based on the size of your cooling system. ![]() Leave that plug out for the 50 minute idle in order to relieve the pressure from building up and thus allowing the product to seal properly. If you are not sure which one that is, you may pull all of the spark plugs and will notice one will have a white-crystal-like substance on it and/or may look dirty this is the plug you should pull. To give yourself the best overall chance of BlueDevil working successfully, in addition to the directions, you should remove the spark plug from the cylinder with the leak this will be the spark plug from the cylinder with the low compression reading. You can use a “Block Dye Tester” to confirm whether or not that is the case.īlueDevil Head Gasket Sealer will still work if your vehicle is getting combustion/exhaust gases blowing into the cooling system and creating pressure. Based on your description, it sounds like you may be getting combustion/exhaust gases pumping back into the cooling system. Thank you for asking about your Chrysler 300. jpg – By Pawzi – LIcensed by Getty Images – Original Link Bumper to Bumper Auto Parts Specialists.You can pick up BlueDevil Oil Stop Leak at one of your local auto parts stores like: If the hard part repair doesn’t make sense for your vehicle, consider using BlueDevil Oil Stop Leak to restore your spark plug tube seals to keep your spark plugs oil free! Replace the tube seal requires removing the valve cover and changing the valve cover gasket as well as the spark plug tube seals. This is caused by a bad spark plug tube seal. If this is the case, you’ll have oil on the tip of the spark plug as well as the white insulator and usually on the spark plug boot as well. The reality is the oil isn’t really on your spark plug but it’s pooled up in the bottom of the tube the spark plug sits in so when you pull the plug out it gets covered in the pooled up oil. If you suspect this a compression test of your engine can help you find out which cylinder has a bad ring and how bad it is.īad spark plug tube seals are the most common cause of oil on your spark plug. This device spaces the spark plug far enough out of the combustion chamber that it won’t get covered by so much oil. In this case an easy, but a temporary fix is to install a spark plug anti-fouler. ![]() If the blowby gets real bad, the oil can foul your spark plug. This will not leave oil on your spark plug as the leak doesn’t happen fast enough to allow a significant amount of oil into the combustion chamber while driving so the oil burns up quickly after you start your car and your spark plug will be dry.īad piston rings will let combustion gases into the crankcase and engine oil into the cylinder. If you’ve got this problem you probably see a small puff of blue smoke when you start your car every morning. A bad valve seal will allow oil to drip from the cylinder head past the valve into the combustion chamber. There are really only 2 ways you can get oil on your spark plug:įirst, let’s talk about bad valve seals. So should there be oil on your spark plug? Even if you’re not a spark plug whisperer, you still probably know that oil on a spark plug indicates a problem. If you’re interested in learning this dying art, check out this cool article about Champion Spark Plugs. They could tell by looking at the color of the electrode and insulator how old the plug was and how the car was running. Reading spark plugs used to be at art that almost every mechanic knew.
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