Quote:
Originally Posted by gmog220d
I have, a few times on at least two OM616s. It is the best way to know cam timing accurately. You need a dial indicator that is scaled right for the measurement, and a way to hold it in place.
I used a magnetic base with jointed arm for holding the dial indicator in place. I bought a set of extensions for the rod to keep the tool above the rocker and cam, which provided a straight shot down to the valve spring retainer. It helps to use a longer tool for rotating the engine, so you have greater control and are less likely to overshoot the 2mm depth.
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While using a dial indicator to measure the movement of a valve provides an admirable degree of accuracy, the reliance upon the production marks from the factory to determine the position of the crankshaft tends to negate the usefulness of the indicator's accuracy.
Who is to say that the pointer is correctly located in the front of the chain case? Who is to say that the circumference of the balance disc or torsional dampner is correctly marked for TDC or the number of degrees before or after? If TDC has not been verified for all of the specific components (crankshaft, balance disc/dampner, pointer) then only one part of the reference, the valve lift, is accurately known. Crankshaft position is not accurately known.
12-26-2020, 11:37 PM
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