B414 Tach Gear drive

Harry Keller · Oct 15, 2013

Is there someone out there who can rebuild the gear box for the 414Tackometer.It mounts on side of engine..The little paddle that goes down inside seems to turn freely but cable does not..

JimB2 · Oct 15, 2013

Hi Harry, many years ago, I rebuild the one on our B-414D many years ago. So long ago I have forgotten how I removed the metal plug out of the end of the assembly. Basically what I remember, I removed the plug and there was a worm gear drive shaft that drove the tach cable and on the plug end of that drive shaft was a fiber thrust washer that had worn out allowing the drive shaft worm gear to push past the gear being driven from the top of the oil pump. I added some metal shims behind the fiber washer, re-installed the plug and secured it somehow and tach was still working when we traded the B-414D for a 454.

JimB

B414 Tach Gear drive

Harry Keller

Member

JimB2

Well-known Member

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