On a recently rebuilt engine it started to blow smoke out of the oil breather cap. I did a Compression Test and No. 2 cylinder is 30 PSI and No. 5 is 40 PSI. All the other cylinders are from 120 to 135 PSI. I want to do a Cylinder Leakdown Test. I understand that you go from one cylinder to the next being sure that the cylinder you are testing is at " Top Dead Center of the Compression Stroke. Isn't the main purpose of TDC on the Compression Stroke to assure that both valves in that cylinder are closed ?
Why can't I just remove the rocker arms ( the one valve cover is already off ) ? That way all the valves should be closed and you just go to each cylinder . Will this work and if not why not ? I was going to get a reading on all 8 clyinders.
Why can't I just remove the rocker arms ( the one valve cover is already off ) ? That way all the valves should be closed and you just go to each cylinder . Will this work and if not why not ? I was going to get a reading on all 8 clyinders.