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Date:  10-15-2016
Number of Hours:  3.00
Manual Reference:  
Brief Description:  tach problem

1) Well, there may be those viewing this log that can recognize the scope probe and drill motor in these pix. the tach sensor if the black item on the left of the board with three wires , leading to the actual tach on the left. It is actually a spare crankshaft sensor from my Dodge pickup...the spare one...that is used in the same way..a magnetic pickup. the wodden dowell in the chuck of the drill has a small magnet taped to one side, so as to pass by the crank sensor when it rotates. The other objece to the right of the dowell and magnet is another 'home made magnetic pickup used to create scope trace that will give me a timing pulse once per rev of the drill, which is coverted to RPM. Now I know what speed the drill is turning with a fair ammount of accuracy. that value should be displayed on the tach if it is reading correctly, which it had not been.

2) Dynamic testing finally showed the scope to be just under 2000 RPM, and the tach shown pretty close, maybe 30 or 40 or so different.I figured I had found the problem and that is ge for me!

The actual problem was not the tach itseld, but a very small soldered in jumper that I did not recognize as such on nitial inspection. The tach was set for a 6 cylinder engine, and removing the jumper appeared to set things right.

Actual engine runup next time should be confirmation, if I can get the Optotach again.

Its reinstalled with the EGT/CHT monitor, and for those who remember, the nest is fixed, the cockpit liiks much more business like!!
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testing

testing

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dynamic testing

dynamic testing

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