UNSUREBOATGUY
Petty Officer 2nd Class
- Joined
- Sep 14, 2009
- Messages
- 117
Hey guys,
I'm sorry if this has been covered in another thread, but I was not able to find it. I have a 1987 3.0 Mercruiser with a Medallion A4550 Tach.
1. Does anyone know what it should be set at? The options are 1, 2, 3, 4
2. Is there an easy way to tell if the tach is bad just by symptoms? The tach was reading about 1000 RPM fast at WOT (I'm 99% sure-have not had a chance to put a shop tach on the motor to test yet-just got the boat not long ago and it is put away for the winter. It is a 1987 Four Winns 160 Freedom and the speedo said about 30-32 with an almost full tank of gas, three adults and two kids at WOT with a 14 x 19P prop. The engine didn't sound as though it was reving too high, though my ear is not that well trained.), and the tach stops at 1000 RPM when I shut the motor down. When I turn the key to "on" and back to "off" the tack drops all the way down to zero. It seems to read fairly accurate at idle when I first start the motor.
This may be a bad time to post this as I will not be running the boat till spring, and I have cleaned connections on the coil and will be replacing the alternator (long story), but I just thought I would throw the question out there if someone could tell me for sure that the tach is junk (in which case I will order a new one), it just needs to be set to a different setting, or I should wait till spring so I can properly troubleshoot.
Thanks for reading this ridiculously long post. Any pointing in the right direction would be greatly appreciated.
I'm sorry if this has been covered in another thread, but I was not able to find it. I have a 1987 3.0 Mercruiser with a Medallion A4550 Tach.
1. Does anyone know what it should be set at? The options are 1, 2, 3, 4
2. Is there an easy way to tell if the tach is bad just by symptoms? The tach was reading about 1000 RPM fast at WOT (I'm 99% sure-have not had a chance to put a shop tach on the motor to test yet-just got the boat not long ago and it is put away for the winter. It is a 1987 Four Winns 160 Freedom and the speedo said about 30-32 with an almost full tank of gas, three adults and two kids at WOT with a 14 x 19P prop. The engine didn't sound as though it was reving too high, though my ear is not that well trained.), and the tach stops at 1000 RPM when I shut the motor down. When I turn the key to "on" and back to "off" the tack drops all the way down to zero. It seems to read fairly accurate at idle when I first start the motor.
This may be a bad time to post this as I will not be running the boat till spring, and I have cleaned connections on the coil and will be replacing the alternator (long story), but I just thought I would throw the question out there if someone could tell me for sure that the tach is junk (in which case I will order a new one), it just needs to be set to a different setting, or I should wait till spring so I can properly troubleshoot.
Thanks for reading this ridiculously long post. Any pointing in the right direction would be greatly appreciated.
