Tachometer does not work

by Tony Garrett in 912 / 914 Technical Questions 10 years ago

I installed my 912 engine an another airplane and now the tachometer does not work. I have tried my old tach and a new tach. There is about 200 ohms resistance between the two wires form the engine. Neither has continuity with the engine ground.

Tony

Re: Tachometer does not work

by Roger Lee » 10 years ago

Roger Lee

129 5.31k 5.12k

You may have damaged a wire on the fifth trigger coil or bumped the trigger coil and moved the air gap. Check the wires and the trigger coil air gap.

Roger Lee
LSRM-A & Rotax Instructor & Rotax IRC
Tucson, AZ Ryan Airfield (KRYN)
520-349-7056 Cell

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Re: Tachometer does not work

by Tony Garrett » 10 years ago

Tony Garrett

20 37 11

Roger, thanks for the reply. The wires look ok. How do I check the coil gap
Tony

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Re: Tachometer does not work

by Roger Lee » 10 years ago

Roger Lee

129 5.31k 5.12k

Hi Tony,

See the Heavy Maint. manual sec. 74-00-00 paragraph section 2.1.1
You can check the trigger coil gaps with a feeler gauge.

Roger Lee
LSRM-A & Rotax Instructor & Rotax IRC
Tucson, AZ Ryan Airfield (KRYN)
520-349-7056 Cell

Report
Re: Tachometer does not work

by Michael D'Amico » 10 years ago

Michael D'Amico

0 1 0

Hi,

I seem to have the tach coil gaps move every 100 hours or so. Is there an aftermarket tach solution that would connect to something less variable such as the electronic ignition or anywherre except those coils at the rear of the engine?

Thanks,
Mike

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Re: Tachometer does not work

by Roger Lee » 10 years ago

Roger Lee

129 5.31k 5.12k

Hi Mike,

These shouldn't be moving once set. Lots of engine out there and they don't move. Loctite the screws and snug them down well.

Roger Lee
LSRM-A & Rotax Instructor & Rotax IRC
Tucson, AZ Ryan Airfield (KRYN)
520-349-7056 Cell

Report

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Tachometer does not work

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