Join Date: Feb 2006
Location: Boise, ID
Bronco Info: 1981 300ci 6cyl w/4bbl conversion. 4spd NP-435 manual. 32" tires.
Sudden onset of extreme lifter tick
Out of the blue, my 300 is suddenly have a massive dose of lifter tick.
It's a very loud, rackety, tinny, *clack* *clack* *clack* *clack* *clack* from the top end.
As said, it just came out of the blue. It wasn't gradual at all, just one morning, there it was. It's so bad, I can hear it in the exhaust.
I've removed the valve cover and everything looks nice and tight, oiling well, and as it should be. Oil pressure (stock gauge) while driving is healthy and easily within the NORMAL range.
The other strange thing is that it'll sometimes just disappear completely. I'll be driving along and it'll suddenly be whisper quiet again. A couple stop lights later, and it's back and full on noisy. Like the lifters occasionally just lose their prime, and then get it back.
A little lifter tick I could handle, but this turns heads as I drive down the street. Not only that, but the sudden onset has me concerned.
Any ideas? I'm not sure where to start, and the idea of just replacing the lifters and trying to mate them with the cam makes me nervous.
March 2016 FOTM
1981 Bronco. 300 I6. 450cfm QuickFuel 4bbl. BFG A/T KO2 32x11.5" tires. NP-435 trans. EFI exhaust manifolds. 2.5" Exhaust. DUI performance ignition. Redhead steering box w/ Saginaw PS pump.