Valve adjustment SBC/BBC

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 [[Category:Adjust valves]]
 [[Category:GM]]
+NOTE:   As with any single "center camshaft" engine (that is fitted with Hydraulic Cam Followers [aka lifters]), we are NOT actually adjusting valves. The term "adjusting valves" is a carry-over from the old days when mechanical valve operation was common. For these, there was an actual valve stem-to-follower clearance adjustment that was required.
+With Hydraulic Cam Followers (originally coined "self adjusting"), we are adjusting the rocker arm stud nut height as to change the push rod geometry as to positon the cam follower plunger "depth" within the cam follower body.
+Many hydraulic plungers will have a hydraulic functioning range of around .100" or so.
+The goal is to set the plunger at it's OEM prescribed depth within the follower body.
+Here is an image that shows a cam follower as it becomes hydraulically active. Note the plunger and it's travel within the follower body.
+http://www.youtube.com/watch?v=lorANZ1Tptw
+This adjustment can be done statically or dynamically.
+When this initial adjustment is done statically, I highly recommend that we stop the crankshaft in as many "stops" as there are cylinders. IOW, for a V-8 engine, we use the 8 stop procedure, beginning with #1 cylinder @ TDC C/S (right down the engine's firing order)..... not the 2 or 3 stop procedure that is sometimes recommended.

Revision as of 15:14, 7 March 2013