I'm putting together a full engine rebuild. The cam journals were too loose so I lapped the base of the cam journal caps (all valves and springs were removed) to within the spec but several were on a tight side (0.0015") from lapping too much. So I let that go. Unfortunately, I forgot to check for ease of turning the cams without the valvetrain installed. I installed 975 valve springs. After everthing was installed (valvetrain in head) I noticed that when tightening the cam pulley bolt the cam would not budge until over 40 ft-lb was applied. Now that's not good. So I proceeded to loosen one cam journal at a time to determine which journal is too tight or causing binding. Sure enough it was at the tight clearanced journal that was causing most of the binding. I removed the material of the journal until I felt it would not be binding.
Now here's my question. Does using 975 springs cause noticeably more drag in turning the cams? I find that it takes up to 30 ft-lb to begin turning the cam then approx 20 ft-lb to keep turning the cams. Is this normal? Also, is there any reason for concern if the cam journals are too tight? Not sure if this would cause the cams to seize in the journals or they will loosen up.
I'm trying to determine if there still too much binding and whether I should I go back into the cam journals or not worry about it? Everthing is together except for the timing belt.
Thanks for any inputs.
Now here's my question. Does using 975 springs cause noticeably more drag in turning the cams? I find that it takes up to 30 ft-lb to begin turning the cam then approx 20 ft-lb to keep turning the cams. Is this normal? Also, is there any reason for concern if the cam journals are too tight? Not sure if this would cause the cams to seize in the journals or they will loosen up.
I'm trying to determine if there still too much binding and whether I should I go back into the cam journals or not worry about it? Everthing is together except for the timing belt.
Thanks for any inputs.
