For some reason I thought I had an account here but there's nothing linked to my email.. I have a wrangler I've been fixing up and am through all of the regular maintenance and real problems. I'm trying to fix the little things now that I didn't really notice before.
1) Raspy/rattle noise from engine when running. Mileage is 73K but the jeep is a 98' so maybe age has something to do with it. I think this is valve noise due to an out of tolerance timing chain. Is this a good conclusion? The timing chain has never been changed. It had a cracked exhaust manifold but I fixed that and there's no exhaust leak now.
Raspy 4.0 wrangler 1998 - YouTube
2) Ticking noise on shutdown. I believe this is coming from the hydraulic lifters from the youtube consensus but I don't know that this needs to be fixed? On shutdown I also hear a draining fluid noise that I believe is oil draining into the oil pan, also nothing to worry about?
Sound at shutdown 4.0 wrangler 1998 - YouTube
Oil was just changed with M1 FS 10w30 and twice prior with conventional 10w30 (various brands) and I believe these noises were present the whole time.