Pressure Tdc
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Once the adapter hose was in place in cylinder No. 1, our starting point, we rotated the engine until this cylinder was at top dead center (TDC) on the compression stroke. In our experience, most accurate results were achieved by rotating the engine to this point by hand rather than bumping it with the starter. We've also heard of removing the rocker arms to ensure that both the intake and exhaust valves are closed. Once TDC was acquired, we inserted the free end of the adapter hose into the quick coupler on the test unit View Related Article
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