Which engine? On Thu, Oct 22, 2020 at 7:58 AM Jeff Nelson <jhnelso...@gmail.com> wrote:
> Here are some thoughts: > When the tachometer (Ign. Sw.) is first turned on, pointer must go to > between zero to 50 RPM > <https://www.cruisersforum.com/forums/tags/rpm.html>. If not, check > connections (if OK, tachometer is probably faulty). > > Voltages, with engine running should be: > IGN to GND terminal: 12-16 VDC > SEND to GND terminal: 0.3 VAC to 1.2 VAC minimum at idle; (voltage will > increase with engine speed) > > The end of the (magnetic pick-up) sender must be within 1/32" -1/16" of > the (flywheel) gear <https://www.cruisersforum.com/forums/tags/gear.html> > teeth, but not touching the teeth. To adjust, stop engine, loosen the lock > nut, and gently turn the sender clockwise until it touches the flywheel. > Back off (counterclockwise) one turn, and secure with the locknut. > > Rust buildup between the flywheel teeth can cause signal loss from the > sender. > > I've also heard of voltage regulators causing some variance. > > At least a few things to try. > > > On 2020-10-22 8:47 a.m., David Knecht wrote: > > I took the boat out yesterday and at ome point turned on the engine when > the wind died and I needed to manuever. When I glanced down at the > tachometer, it read 4000 rpm. However, from the throttle setting, the > engine sound and the boat speed, it was more like 2000 rpm. I had run the > engine before and all was fine. I ran it later and all was fine. What > might cause a temporary abberant tach reading? Thanks- Dave > > David Knecht > S/V Aries > 1990 C&C 34+ > New London, CT > > > > October is the time to show your appreciation with a small contribution to > this list to help offset the costs. If you want to support the list - use > PayPal to send contribution -- https://www.paypal.me/stumurray Thanks - Stu > > > > > <https://www.avast.com/sig-email?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=emailclient> > Virus-free. > www.avast.com > <https://www.avast.com/sig-email?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=emailclient> > <#m_1769882661065946772_DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2> > October is the time to show your appreciation with a small contribution to > this list to help offset the costs. If you want to support the list - use > PayPal to send contribution -- https://www.paypal.me/stumurray Thanks > - Stu -- Joel
October is the time to show your appreciation with a small contribution to this list to help offset the costs. If you want to support the list - use PayPal to send contribution -- https://www.paypal.me/stumurray Thanks - Stu
