Tachometer question on my M35A3 ?

[Redneck of Enon]

my tac just stopped working and not only I like all the gauges to work but the tac has the hour meter on it and I need that ....I have checked the wires at the alternator but they all look good ...so now im going to check the wires behind the tac ....but it would be nice to hear from y'all on this ....I appreciate all your expertise and opinions ! thank you all and merry Christmas

 

[Menaces Nemesis]

DOH! just saw you have an A3. I know on the A2 the tach is cable-driven via adapter on the front of the engine, so either the drive adapter, cable, or tach would be broken or disconnected on an A2, don't know about an A3 though.

 

[Redneck of Enon]

DOH! just saw you have an A3. I know on the A2 the tach is cable-driven via adapter on the front of the engine, so either the drive adapter, cable, or tach would be broken or disconnected on an A2, don't know about an A3 though.

thanks ,,,,, im going to check it out now

 

[Monkeyboyarmy]

The A3 uses a magnetic pickup that is located in the bellhousing. Sometimes they get dirty but they are adjustable in and out for a specified gap to the flywheel.

 

[Redneck of Enon]

I took the tac out of dash and found that its not cable driven , its electronic . I did find a ground that was loose and fixed that but the tac and the hour meter on it still don't work .

 

[frank8003]

Post #2 might even lead You to that specific TM that you should read/understand.

 

[Menaces Nemesis]

M35A3 Tachometer stuff...
https://www.steelsoldiers.com/upload/M35/TM9-2320-386-24-1-1.pdf
TACHOMETER REPLACEMENT Page 0095 00-1, MAGNETIC SPEED SENSOR REPLACEMENT Page 0097 00-1

 

[WillWagner]

Pull the sensor from the flywheel housing, clean the end with a rag, no need to use a liquid cleaner. Make sure the potting material is not loose and the magnet is in the end of the sensor. Re install until it GENTLY touhes the ring gear, back it off 1/2 turn and LIGHTLY lock the nut down, IIRC 5-8 in lb...remember the pick up is thin aluminum.

 

[Redneck of Enon]

Thank y'all very much ,