90 HP Mariner ELPTO Rev meter

[tso_privat]

Hi Guys

I just finished a major rebuild. When i tested 2 days ago the Rev clock is not showing the right RPM. It shows for sure 2000 rpm to much. Any clew ?

Please help.

Cheers From Denmark

[Turbodiesel]

Try changing the pulse setting on the back of the tacho.

[tso_privat]

Originally Posted by Turbodiesel

Try changing the pulse setting on the back of the tacho.

uhh, how do i do that ?

[captnjack]

Originally Posted by tso_privat

uhh, how do i do that ?

See if you can find a manual for the tach online. There are pins on the back which need to be set to correspond to the engine. You might be able to reset it with it still in the console, but chances are you'll need to un-do the tach's mounting bracket from behind to see the pins. Some have a dial instead of pin switches.

[tso_privat]

Originally Posted by captnjack

See if you can find a manual for the tach online. There are pins on the back which need to be set to correspond to the engine. You might be able to reset it with it still in the console, but chances are you'll need to un-do the tach's mounting bracket from behind to see the pins. Some have a dial instead of pin switches.

uhh nice, thanks, hope you found it for me

[captnjack]

Can't see what brand tach you have in that console.

[tso_privat]

Originally Posted by captnjack

Can't see what brand tach you have in that console.

Its an old instrument with a M sign in it. (Mercury i believe)

[Festinghouse]

the ones ive had have got a round black selector switch on the back - this should be set to 6p - the tacho gets its signal from the charging side of the stator, and is nothing to do with ignition pulses. thats why my 4cylinder force has the same setting as my 3cylinder mariner 75.