Driving home yesterday pressed on the pedal and a sudden tick tick tick miss etc, Found loose rocker arm on #4 exhaust. crap. Pulled the intake and offending lifter and found the plunger stuck down. Clip still in place but retaining ring was cracked, I assume it was collateral from the pushrod beating around. Everything else looks fine. Happened at maybe 2000 rpm and I limped it home about a mile.
Removed the plunger from the shell expecting to find debri or broken spring but all looked fine. Unable to disassemble the plunger assembly. Ill try again tonight but it was late last night.
Ideas why? This cam and lifters had little run time then sat on a shelf for about 5yrs, about 600 miles of cruising and beating the living snot out of it in the current engine over last few months. I should mention this is a flat tappet and I do not know what brand of lifters they where provided by Oregon cams.
Can I pull the guts from a new lifter and put them in the original shell? After doing some measuring and comparison of course. Or just throw a new lifter in and pray it breaks in.
