23-04-2021, 08:19 PM
(This post was last modified: 23-04-2021, 08:36 PM by Bob Culver.)
If the timing gears are a pair, and the cam standard the nearest tooth will be correct and does not need great precison. The valves ""rock"" ie are both equally slightly open 7 1/2 deg ATDC. For that the upper flanks of both cams should be equally just above horizontal. Easily established by eye ,assisted by laying some thin sheet across them.
To check in detail have to establish tdc, a bit tricky without piston to obstruct. A vernier calliper depth rod useful. Or a narrow flat surfce horizontal object projecting into the crankacse cyl opening and obstructing the crank rotation enable tdc to be determined from the half of the angle obstructed.
If cannot judge cams as above,a bare block with just two equally adjusted cam followers and two valves without springs all that is necesary.
May be differnt for a reground cam.
To check in detail have to establish tdc, a bit tricky without piston to obstruct. A vernier calliper depth rod useful. Or a narrow flat surfce horizontal object projecting into the crankacse cyl opening and obstructing the crank rotation enable tdc to be determined from the half of the angle obstructed.
If cannot judge cams as above,a bare block with just two equally adjusted cam followers and two valves without springs all that is necesary.
May be differnt for a reground cam.