Tach connection cover: What can I use to cover the Tach drive on a Lycoming O-320 (since with Dynon we don't use it)?
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jakej
Well-Known Member
They are usually available for your favourite aviation supply store - unless it's on back-order like a few things nowadays 
Would you believe a USA friend told me he could not get the copper spark plug washers from his store & another guy here said he was unable to get Lyc valve guides, go figure !
Would you believe a USA friend told me he could not get the copper spark plug washers from his store & another guy here said he was unable to get Lyc valve guides, go figure !
Raymo
I love aviation!
There is a screw-on cover with a gasket you can install.
www.aircraftspruce.com
Tachometer Cap | Aircraft Spruce
Tachometer Cap This Tach Cap is a small plug which can be used to close off the tachometer drive of a Lycoming engine when an electronic tach drive is being used off of the magneto. It has a 7/8
www.aircraftspruce.com
longtimebuilder
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N941WR
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If you are building up your engine and know you are not going to use the tach drive, be sure to install it, along with a cover, as described.
A friend built up his engine and left the tach drive shaft out, with the blessing of Superior. It turns out there is an oil squirter that lubricates this shaft and if the shaft is not installed, it pumps oil out the breather. It cost him a new crank, bearings, connecting rods, etc
A friend built up his engine and left the tach drive shaft out, with the blessing of Superior. It turns out there is an oil squirter that lubricates this shaft and if the shaft is not installed, it pumps oil out the breather. It cost him a new crank, bearings, connecting rods, etc