Rocker Arm/Valve stem interface
Posted: Fri Apr 12, 2013 3:05 pm
While I wait for my pushrod length checker to come I took some time today to try to get an idea what my rocker arms were doing when they were pressing on the top of the valve stem. Let me start out by saying I've just had my rocker arm assembly rebuilt by Rocker Arms Unlimited (http://www.rockerarms.com/index.html) which included a new hard chromed shaft, new bushings and tips re-radiused so I'm hoping that its in good shape. Also, the valve stem heights are all the same.
I loosened all the rocker arms and marked the tips of the valve stems with a black magic marker (I'm pretty sure a dry erase marker would be better but I don't have one of them). I then rotated the crankshaft and set each rocker arm tight against the valve stem (i.e., no clearance) so I could (hopefully) get a pattern on the stem.
The following is what I got -
I loosened all the rocker arms and marked the tips of the valve stems with a black magic marker (I'm pretty sure a dry erase marker would be better but I don't have one of them). I then rotated the crankshaft and set each rocker arm tight against the valve stem (i.e., no clearance) so I could (hopefully) get a pattern on the stem.
The following is what I got -