Join Date: Jan 2008
Location: Seattle, WA area
Re: Roller Assembly "Assembly"
Refer to your manual first. While the rockers on hydraulic cam positive-stop and pedestal rockers is a bolt-down affair (in any crank position), the lifter preload must first be confirmed or established. Your lifters should have .020 to .030 preload on them when fully torqued to spec. This is done with pushrod length and adjusting shims. This preload must be right before torquing everything down.
An easy way to see if it's about right is to set one cylinder to TDC firing position. Then assemble one valve set together (two rockers, pushrods and the channel alignment piece - no oil), and bring the socket-head bolts down to take-up the slack with your fingers while spinning the pushrod with your other fingers. You should have spinning resistance (zero lash) at less than 1-turn remaining, but more than 1/4 turn. This is outlined in your manual.
If the preload is outside this range, the pushrods, adjusting shims, or both will have to be used to bring preload into spec.
-=≡ If it was easy everyone would do it ≡=-
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