brucecooner Posted February 1 Share Posted February 1 I've been hearing a brand new noise from the 4.0 the past few weeks. This is definitely not the old piston slap, I had gotten used to hearing that. This sounds like, dried peas rattling around in a tin can. It seems loudest around the area of #1 up in the valve cover... 20230131_174537.mp4 I can also hear it from underneath too. Not sure if it's coming from the bottom or just traveling from up high. 20230131_174646.mp4 It's been running Rotella T5 30 weight oil for a while now. I'm wondering if this oil cleaned up the top end which coupled with the lighter-ish weight oil let a tired lifter start nagging. IF it's a lifter, is that something that can be fixed with the valve cover off? (I have a new cover gasket waiting for me to get to it) Quote Link to comment Share on other sites More sharing options...
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.