Home |
Search |
Today's Posts |
#10
|
|||
|
|||
Motor runs rough with tach wire hooked up
On Tue, 17 Feb 2004 18:17:08 GMT, "Ed Barchetta"
wrote: "Short Wave Sportfishing" wrote in message .. . Here's a couple of suggestions, although these might not be the answer. Check the wire along it's route for abrasion, cracked insulation, etc. You might also want your mechanic to test the coil. Pull the tach and try it on another engine. I would suspect either the tach itself or a short somewhere along the wiring route. I've already eliminated the coil from the equation so it's between the coil and the throttle. The visible wiring looks good with no cracks. I'll have to get into the throttle area to examine the connections/wire. I'm not familiar with the throttle system you use, but I have worked on a similar age Merc throttle control and I believe the tach wire, along with temp sensor, oil pressure etc., went to a connector block and then to the instruments. Pull the connector apart and check for corrosion, shorts, etc. I can't remember what my guy called it but the 'switch' inside the throttle area that stops you from being able to go into gear while the rpm's are too high may be related. By disconnecting that system at the coil, we run ok, although after any length of high speed run (25 mph and 3500 rpm), I have to slow to trolling speed for about a minute before I can get it back into neutral or manuever into a dock. Neutral safety switch - somebody mentioned that and it certainly could be the answer. And, as it happens, I can answer that. It's not hard to get to - you have to remove the control from where it is mounted to get behind it, then, and this may vary a little, remove the rear/front cover - it may be a reed switch or contact switch - again, I'm not sure of what kind of switch. It will be on or near a cam located on the throttle arm pivot point. It could be inboard in the throttle control body - the one I worked on was located there, but I replaced the control with one that was on the outside. I'm guessing here, but you may not be able to get a new switch. I have worked on one of these for somebody in the family who had a merc controller of the same vintage and while I could modify one to work, it wasn't very good repair. You may have to consider a new control. Hopefully not. Out of curiosity, do you have to search for neutral when shifting in and out of gear? If so, it may be more than just the switch in the throttle. Good luck. Later, Tom S. Woodstock, CT ---------- "Fisherman are born honest, but they get over it." - Ed Zern |
Thread Tools | Search this Thread |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Forum | |||
Evinrude tach problems | General |