HELP, Can't: WOT, Shut Off, Charge System

Joined
Mar 21, 2005
Messages
6
Hello,<br /><br />I have a 1986 V6 200 that needs help! <br /><br />Symptoms: When I hit the water with charged batteries this weekend I could get WOT and the engine ran GREAT! Then after about 5 minutes of this, it started to stutter and I would have to back the throttle off to below 4000rpms, then it would run without stuttering. The engine would be fine as long as I kept it below 4000, but of course, my big boat doesn't get off plane tell 4500 (go figure). I checked to make sure the Ball is hard and it is (pumped it when over 4000 and nothing happened), so fuel flow is not an issue. On my dash gauge and Depth Finder I show 12.0V with engine off and 13.8-14 with the engine on. Now the weird thing is that even with my voltage never dropping below 12.8 when running, I will loose enough amp's to keep my electronics running! After putting around for about an hour at 3800 rpms, my Depth Finder goes blank and I can't use the transom lift for the motor. BUT during this whole time, I still get 13+ readings on my voltmeter???? Then when I finally headed back a new problem happened that I think spawned from this whole issue, it wouldn't shut the motor off. I had to CHOKE the motor off.<br /><br />What I did during to try and fix the problem: I have 2 batteries, when I lost the ability to go WOT I switched it from ALL setting to Battery 1 (to save Battery 2), then later switched to Battery 2 and the SAME RPM issue existed, even in ALL. Then I turned off all the batteries so I was running off the engine alone and nothing changed. You couldn't tell the difference in reaction between battery 1, 2, ALL, or None!<br /><br />Things I did recently to the engine: It has a brand new Stator (put in this week) along with a new flywheel (Lost a magnet in the last one).<br /><br />My first instinct is Voltage Regulator, but I AM getting a voltage increase when the engine is running. Starter Solenoid, maybe, but that won't effect WOT? Lastly Powerpacks.. I actually know nothing about powerpacks so this is where I would like advise. I am a Helicopter Mechanic and restore old cars as a hobby, so the "powerpack" is a little illusive on what it is, what it controls, and how it affects things. I do know that the shut off diode is located in the power pack and there is a method to check it, I will do that, but what about the WOT issue?.<br /><br />Thanks for reading this over and hope someone knows EXACTLY what I am talking about.<br /><br />P.S. You can see the boat/motor at http://renaissance.50megs.com/wellcraft.htm
 

Silvertip

Supreme Mariner
Joined
Sep 22, 2003
Messages
28,771
Re: HELP, Can't: WOT, Shut Off, Charge System

You run the risk of frying your regulator if you switch your battery switch to off while the engine is running. The fact that your voltmeter showed the charging system was working, that does not mean the voltage is getting to the batteries. Your locator is not connected at the same point in the system so thats why it indicated less than 12.6 Volts (it was measuring battery voltage -- not charging voltage). You need to check battery switch terminals and battery cables (both ends). The batteries had nothing to do with the WOT problem as you proved. Performance troubleshooting should start with a compression check. If its ok, check for good fat spark on all cylinders. If thats ok, you might have reason to remove, clean, and rebuild the carbs (especially if it hasn't been done in recent years).
 
Joined
Mar 21, 2005
Messages
6
Re: HELP, Can't: WOT, Shut Off, Charge System

upinsmoke,<br /><br />Carbs were rebuild 3 weeks ago, all terminal connections were removed, cleaned, greased, and reconnected. Compression for all 6 cylinders is 110-112. For the first 5 minutes the engine ran perfectly without fail, so it's not a persistant problem. It was only after the engine depleated the cranking amps of the battery did it loose it's ability to maintian over 4000rpm.<br /><br />I understand the 2 sources for voltage are NOT at the battery directly. but with engine off they were always near 12 (showing a charged battery) and when running would show 13+ showing the extra voltage being sent through the system by the motor.<br /><br />For those who know more about the powerpack function... Does the powerpack regulate the voltage from the stator utilized by the engine? If that was faulty for some reason, would it NOT send enough voltage to the engine to run at higher RPM's? Thus relying on the Battery's to make up the difference in DC power tell that Extra amperage was drained?
 
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