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Original Message
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| RE: 360 rail rockers HELP! |
| By gerry - 03/07/2001 7:55:40 AM; IP 208.217.67.246 |
First, the rockers are oiled through the shaft by one oil supply hole in the head that is hidden by the shaft stand. To accommodate the head's oiling passage, the bolt that secures the stand for that location is a little longer than the other three stand bolts. If you remove the rocker shaft stands, you will see where the oil passage is in the head and be able to clearly identify that the correct stand and bolt are in their proper place. It is not possible to put the longer bolt in the other locations. Just to make this abundently clear, the valve train is not lubricated through the pushrods.
There is a proper orientation for the rocker shaft oil holes. They will always be pointing down.
As I recall, the proper final torque specification for the shaft stand bolts is 40 lb/ft. You have to gradually approach this number and the service manual adequately addresses this, but basically you give each bolt about a quarter turn at a time in order to evenly distribute the loading from spring tension across the length of the shaft.
As for adjusting lifter pre-load...unless you have adjustable rocker arms, you can't. Technically, you could shim the rocker shaft stands, but this would only decrease pre-load which, depending on the specific mechanical problem you are chasing, could be taking you in the wrong direction. You absolutely do not adjust pre-load by using the stand bolts.
I don't know what's causing you noise, but I would check the rocker shaft stands to ensure they are not loose, then move onto the other parts of the valve train. Try to find any pushrods that will easily spin with the valve fully closed since this will lead you to a collapsed lifter or other valve train problems. If you have to go deeper and remove the rocker assembly, pull off a rocker and make certain that the oiling holes are pointing down.
Hope some of this helps. |
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