SugarRay8
Well-known member
On my Hemi I can feel air coming out of the spark plug tubes. Seems like the plugs aren’t sealing into the head, but they are tight. Any ideas what I need to do, maybe the tubes themselves are not seating properly?
SR8, When you cleaned out the rocker shafts, did you remove the caps from the ends to do it. It's the only way to really clean them out well. Good job as this is is a common issue when not addressed and if not caught in time can of course lead to some real damage. Also, the spark plug tubes are considered an expendable items that get replaced when they start getting marred. One last note, if your spark plugs came with the aluminum gaskets at the thread base, they NEED to be romoved before installation into a hemi. Some people get them to seal, but it's not correct and can lead to leaks and damage your spark plug tubes. I'm not trying to insult your hemi knowledge, I'm just tossing these things out there in case you didn't know.
Thank you!
We did not remove the caps, so I’ll re-clean them with the caps off.
The caps are similar to a freeze/core plug. They will need to be replaced if you remove them. I will add that the inside of those shafts should be really clean and free of obstruction as the lubrication to the valvetrain components travels through them.
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