Digital tach
Moderators: GAHorn, Karl Towle, Bruce Fenstermacher
- ghostflyer
- Posts: 1395
- Joined: Mon Apr 21, 2008 3:06 am
Digital tach
I will be fitting a digital tachometer made by Electronics International , ok the wiring up is the easy bit but the hard thing is on removal of the old drive cable . So what do we do with the drive cable attach point on the gearbox . EI doesnt give any direction on this one . There is a hole in the gearbox to sort out . ( all of the digital tachometer is STC ,d of course). So that leaves only the flight instruments left on the aircraft that are steam ( vacuum driven with Venturi,s ) driven . Presently I am looking at the Garmin system also . I was told you can remove the gears from the gearbox and put a plate in but this is something I feel should not be necessary . So has anybody fitted a digital tacho to a lycoming engine . ?
- Bruce Fenstermacher
- Posts: 10320
- Joined: Tue Apr 23, 2002 11:24 am
Re: Digital tach
In theory, you should be able to simply disconnect the tack drive cable and leave the attachment housing open. You can't remove the oil pump gears have the shaft which the tach drive cable couples. The seal #17 should seal against the shaft and stop oil leaks weather a tach drive cable is attached or not.
Missing of course from the drawing above is the entire accessory case which the oil pump gear tach shaft couple extends through and the tack drive cable attachment housing is fasted.
Missing of course from the drawing above is the entire accessory case which the oil pump gear tach shaft couple extends through and the tack drive cable attachment housing is fasted.
CAUTION - My forum posts may be worth what you paid for them!
Bruce Fenstermacher, Past President, TIC170A
Email: brucefenster at gmail.com
Bruce Fenstermacher, Past President, TIC170A
Email: brucefenster at gmail.com
- ghostflyer
- Posts: 1395
- Joined: Mon Apr 21, 2008 3:06 am
Re: Digital tach
Thank you for that, however my tacho shalf does have some oil in it as I thought it was for lubrication reasons . I would be feeling more comfortable with a cap over the end of the housing .
Re: Digital tach
A cap that will fit either The continental or lycoming tach drive housing is available from aircraft spruce, Chief aircraft or Van's aircraft. I think they are about 8-10 bucks.
Ed Booth, 170-B and RV-7 Driver
Re: Digital tach
My digital tach (Continental) came with a screw on cap for the tach drive.
OLE POKEY
170C
Director:
2012-2018
170C
Director:
2012-2018