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Original Message
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| Valve adjustment |
| By raycfe - 06/26/2005 8:03:31 PM; IP 64.252.182.53 |
The cranksaft goes around twice for every once the camshaft does. So if your firing order is 15426378 as a 390 is, when #6 exhaust valve is just closing and #6 intake valve is just opening---#1 is starting its compression stroke and the adjustments on #1 can be checked. (All I did was divide the firing order in half. 1&6, 5&3, 4&7, 2&8) The start of the compression stroke is when the valves are closed the most. To check the adjustment the lifter has to be bleed down(Collapsed), push down very hard on the pushrod end of the rocker will do this. The clearance can then be checked with a feeler gauge--the spec is 0.100-0.200 of an inch. If you have too much clearance you need longer pushrods(the ford way) or adjustable rockers. There is different lenght fe rushrods.
**To adjust hyds with adjustable rockers loosen the rocker adjustment until the pushrod is loose, then tighten it back down until the looseness is just gone, then another 3/4 to 1 turn. The gap can be checked as above if needed.
**Solids are just adjusted with each cylinder starting it compression stroke and the clearance checked with a feeler gauge between the tip of the valve and rocker. .025 hot or .028 cold.
**After the first cylinder is done (#1) ,turn the engine over by hand and watch the rocker on #6, exhaust just close intake just open and adjust cylinder #5. And so on and so on until all 8 cylinders are done. |
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