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Forum: Engines and Propulsion Systems

14-07-2019, 19:00

Replies: 15

Yanmar 2GM tach

Views: 3,696

Posted By dennismenace111

Re: Yanmar 2GM tach

Probably the best suggestion yet! I still have to find a way to get this fat old body to place where I can access the sensor. So far, I've only been able to touch it by reaching over the engine,...

Forum: Engines and Propulsion Systems

11-07-2019, 06:36

Replies: 15

Yanmar 2GM tach

Views: 3,696

Posted By dennismenace111

Re: Yanmar 2GM tach

It doesnt look like there are any components other than a magnet and two wires...

As I understand the operation, these sensors use HALL effect to count the teeth and transmit alternating positive...

Forum: Engines and Propulsion Systems

11-07-2019, 05:42

Replies: 15

Yanmar 2GM tach

Views: 3,696

Posted By dennismenace111

Re: Yanmar 2GM tach

My thoughts exactly.... But it's basically a magnet with two wires. Not alot to fail.

Forum: Engines and Propulsion Systems

11-07-2019, 03:45

Replies: 15

Yanmar 2GM tach

Views: 3,696

Posted By dennismenace111

Re: Yanmar 2GM tach

I've opened and checked every plug in line from the sensor to the tach. When I throttle back to read idle, the tach quits and won't indicate again till it sits for an extended time....usually...

Forum: Engines and Propulsion Systems

10-07-2019, 16:15

Replies: 15

Yanmar 2GM tach

Views: 3,696

Posted By dennismenace111

Re: Yanmar 2GM tach

It appears to be. It's in a Watkins 29... One must be a contortionist and 15 years old to be able climb through the hatch in the lazarette to reach it....or from the front of the engine, one can...

Forum: Engines and Propulsion Systems

10-07-2019, 15:59

Replies: 15

Yanmar 2GM tach

Views: 3,696

Posted By dennismenace111

Re: Yanmar 2GM tach

Measured again today. I'm getting 1.8v AC on the tach sensor leads at the plug on the instrument panel. On the back of the rack, I'm getting only 1.4 volts AC.

I guess when I throttle back, it...

Forum: Engines and Propulsion Systems

06-07-2019, 14:44

Replies: 15

Yanmar 2GM tach

Views: 3,696

Posted By dennismenace111

Re: Yanmar 2GM tach

It's either related to that or possibly the sensor itself or the wiring is getting hot and resistance is going up...it's only 1.8 volts. It won't take much to drop that to zero...the interesting...

Forum: Engines and Propulsion Systems

06-07-2019, 06:07

Replies: 15

Yanmar 2GM tach

Views: 3,696

Posted By dennismenace111

Yanmar 2GM tach

Im having a strange issue with my tach on my 1987 Yanmar 2gm20F.

In the morning when I start up the engine the tach operates perfectly. I have about a 2 mile cruise down the river, and must...

Showing results 1 to 8 of 8

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