|Originally Posted By 17Z:
Stuck lifter?....Risilone is your friend!!
My little Jimmy short-wide's 4.3 V6 stuck a lifter bad...sounded like a rod knocking..not just a minor lifter rattle.
...Changed oil in it..added a quart of Risilone oil treatment..and let it run for a few minutes...and it quit the lifter knock.
Risilone has fixed up my 'sticky lifter issues a several times. If it's just a bogus crudded up lifter, Risilone will generally fix it....but it won't fix bent pushrods, flat cams, and cupped-out lifters
The zinc issues wearing down cams and lifters is a real pisser..as I understand it...more an issue with new installed cams than with broken in...long running engines. Solution..run diesel rated oil. As mentioned above..Rotella's good..but lots of diesel oils on the market.
I just found out that Mystic oil(what I've been using)is owned by Citgo now....Hugo Chavez oil...
....Probably be switching brands when my oil stockpile is used up.
I accelerated the engine to ~4,500 RPM, that's when the lifter noise started. Pulled the valve cover fully expecting to find a bent push rod or broken pivot, however nothing was found the first time, next day I pulled it back off and this time the collapsed lifter was very evident. The engine still has very good oil pressure even at hot idle.
I'll try an oil change and a can of Rislone, certainly can't hurt and it's not that expensive. IF there's any damage to the cam and/or lifters it is a direct result of this one incident, not from normal operation. This motor ran very well and was quiet, which for a Jeep 4.0 is unusual in itself.