Hydraulic lifters
#1
![Default](/forum/images/icons/icon1.gif)
1963 Corvette runs rough at normal half turn valve adjustment but smooths out at very loose lash (1 and half turns loose). This was a previous owner rebuild with less than 100 miles but no details or parts list came with the car. Car was parked for over a year, are the hydraulic lifters the most likely problem? Thanks for any help, this one really has me puzzled...jim
#2
CF Monarch
![Default](/forum/images/icons/icon1.gif)
1963 Corvette runs rough at normal half turn valve adjustment but smooths out at very loose lash (1 and half turns loose). This was a previous owner rebuild with less than 100 miles but no details or parts list came with the car. Car was parked for over a year, are the hydraulic lifters the most likely problem? Thanks for any help, this one really has me puzzled...jim
#3
CF Monarch
![Default](/forum/images/icons/icon1.gif)
You should have about .010" clearance from rocker arm to valve with valve full closed. With a collapsed lifter it would be the other way around, having to compensate for the lifter at the rocker arm. As stated since this only has 100 miles, either replace lifters, at least pull them they can usually be cleaned up, and re-used. Is this happening on all cylinders?
Also on the bottom of the lifter, check that the cam lobe isn't "banging" the lifter, this could be a cam shaft issue.
Also on the bottom of the lifter, check that the cam lobe isn't "banging" the lifter, this could be a cam shaft issue.
Last edited by kevinkpk; October 31st, 2019 at 2:44 PM. Reason: Also on the bottom of the lifter, check that the cam lobe isn't "banging" the lifter, this could be a cam shaft issue
Thread
Thread Starter
Forum
Replies
Last Post