I couldn't find an image of the atomic 4 valve clearance technique, which is well described here in other posts, so I made up this. Is it correct? My understanding is that the clearance is maximum, the valve spring is fully relaxed and the valve is closed when the camshaft has rotated to that piston's TDC, and that both intake and exhaust valves at a cylinder are closed at the piston's TDC.
Also attached: the valve clearance adjustment worksheet I made up and Don reviewed a few weeks ago in another post somewhere here.
UPDATE #1: clearer image to show the clearance gap better. The valves are nicely diagrammed in Robert Staton's "Service and Repair Manual for Atomic 4 Marine Engine" (Seacraft Publications, Toronto, Canada).
UPDATE #2: the label "locknut" in the image below is wrong. It isn't a locknut, just the top of the tappet shaped to take a wrench. Hold the tappet with one wrench and twist the adjusting nut with another wrench. Takes some force to move that nut. See rest of thread.
Also attached: the valve clearance adjustment worksheet I made up and Don reviewed a few weeks ago in another post somewhere here.
UPDATE #1: clearer image to show the clearance gap better. The valves are nicely diagrammed in Robert Staton's "Service and Repair Manual for Atomic 4 Marine Engine" (Seacraft Publications, Toronto, Canada).
UPDATE #2: the label "locknut" in the image below is wrong. It isn't a locknut, just the top of the tappet shaped to take a wrench. Hold the tappet with one wrench and twist the adjusting nut with another wrench. Takes some force to move that nut. See rest of thread.
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