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Hi Spiv & patquin,
I just did this on my Sonett a few weeks ago. Yes "rock" means when the pulley notch is at the TDC mark. At this postion either #1 or #4 cylinder will be at the point where both the intake and exhaust valves for #1 or #4 "will rock" if the crankshaft is turned slightly back and forth. I found by removing the spark plugs I could turn the engine over by hand using the fan/drive drive belt. Once you are at TDC and you have found which cylinder "will rock" you can proceed to adjust the clearance of four valves easily.
As you no doubt know, when facing the motor the cylinders are numbered (front to back) 1-2 on the left and 3-4 on the right. Valves are numbered (front to back) 1-4 on the left and 5-8 on the right. They can be adjusted on a warm engine after it has sat for only ten minutes as the valve play will then correspond to that of a cold engine. Note that valves at #’s 1, 4, 5 & 8 are intake and at #’s 2, 3, 6 & 7 are exhaust. As stated by Spiv, the feeler gauges should just slide (with slight resistance) between the rocker arms and the tops of the valves. With a 0.35 mm (0.014") feeler gauge for the intake and a 0.40 mm (0.016") feeler gauge for the exhaust, the valves can be adjusted as follows:
If both rocker arms "will rock" on the # 1 cylinder (left side front), then the valves at #’s 3, 5, 7 & 8 can now be adjusted. Remember though that valves #3 & #7 are exhaust and #5 & 8 are intake. If not turn the motor one full revolution (set at TDC) and now both rockers on # 1 cylinder should “rock”. Once you have adjusted these four valves rotate the engine one more full revolution. Now both rocker arms on the # 4 cylinder (right side rear) "will rock". The valves at #’s 1, 2, 4 & 6 can now be adjusted. Again remember that valves #1 & #4 are intake and #2 & #6 are exhaust.
posted by 24.66.16...
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