if you want to find #1 firing position, take the plug out of #1. stick something in there so you can feel the top of the cylinder. rotate the engine until the piston is at the top of the cyl, and make sure the intake and exhaust lifters are in the base circle. if the rocker arms are off, you can just watch the height of the pushrods.I'll have to take off all intake and exhaust rocker valves to replace the support stand. Question for you all-in order to do so I'll need to make sure engine is rotated to TDC. Right now (right bank), cyl #2 exhaust valve is what's being worked on-without the timing cover off, how do I verify cam/crank position? I looked at the harmonic balancer and see that it's got 4 sets of dots around the circumference in a pattern like o oooo oooo o but I'm not sure what these marks refer to.
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Instead of looking at dots I may be able to rotate the crank and follow the movement of one of the pushrods.
i've never had a bad lifter before, but I can tell you how it SHOULD act.Can I inspect for a bad lifter without pulling the head by replacing support, rocker arm, pushrod and checking to see if the rocker arm then has play i.e. it looks like I can substantially vary the lash?
i've tightned the rocker arm the way you describe in the past and haven't had an issue. i don't do that anymore. but yes, i do want to make sure most if not all of the 22 ft lbs goes into fastener clamping force and not compressing the valve spring, lol.Why do you need to only tighten down the rockers when they are on the base circle? They are not adjustable, so tightening them down wherever they are would seem to accomplish the same thing as tightening them down when they are on the base circle. I mean, if you're tightening down a rocker where the lifter is at the top of a lobe, it will simply open the valve as you tighten the rocker down, right? Which is where it would have been anyway before you removed the old rocker.
Is the base circle thing so you can get the rocker bolt torque correct?
sounds like wise advice.I found some rocker instructions somewhere just now that said to absolutely NOT remove a rocker when the valve is open to avoid messing up the rocker bolt threads. I guess that make some sense too since there is a lot of pressure against that bolt when the valve is open and the threads are in aluminum not steel or iron.