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Author Topic:   Cantankerous Merc 40 and useless repair facility
Wayneman posted 07-30-2002 11:02 AM ET (US)   Profile for Wayneman   Send Email to Wayneman  
Hello out there. My repair facility has replaced the stator and the switchbox on my apparently useless 1981 mercury 40 hp. In addition, the engine has been rebuilt, waterpump changed, plugs changed and solenoid switch replaced. I have spent $500 in the last 6 months. The engine died again after running wonderful for 2-3 hours. It just died and wouldn't restart untill cooled off. It always pumped water fine. Now it will not stay running. before I deep six my old 64 Montauk and this useless beastie, does anyone have any advice? Thank you. Mr. Zoloft.
Bigshot posted 07-30-2002 02:49 PM ET (US)     Profile for Bigshot  Send Email to Bigshot     
Coil? Is it fuel or spark related? When it dies does it still have spark? When it dies will it run on ether(starting fluid)?
lhg posted 07-30-2002 03:15 PM ET (US)     Profile for lhg    
If yours is the old 2 cylinder 40, you should get rid of it. I think this was suggested to you a while ago. In my opinion, those 35/40's were one of the worst engines Mercury ever made. The block is one third of the in-line sixes, but for some reason just didn't work out.
DJS posted 07-30-2002 04:31 PM ET (US)     Profile for DJS  Send Email to DJS     

I don't know anything about a 1981 Mercury 40 HP, but what you describe sounds just like some of the problems I had with my 1995 Mercury 200 HP; particularly the part of running great for 2 or 3 hours and then just quitting. On my engine there are two black boxes, one is called an Idle Stabilizer/Advance Module, the other is a Low Speed/High Speed Spark Advance Module. My Mercury mechanic (over 30 years repairing Mercurys and personal friend)said these are sometimes prone to heat up an electronic diode (built into the module) and will cause them to fail. My mechanic checked out all the electrical on my engine with electronic diagnotic instruments and still could'nt find anything wrong. Since both of mine had been replaced with after-market modules (which he said is not a recommended thing to do) we replaced both modules, with the understanding that if they didn't correct the problem he would take them back and reinstall the old ones. So far everything is working correctly.

Perhaps you have something similar to this that won't show up with conventional analysis. Just a suggestion.


Wayneman posted 07-31-2002 10:53 AM ET (US)     Profile for Wayneman  Send Email to Wayneman     
Thank you all. I am at a decision point here. And I must check and see if it still has spark after it quits. I think I am just about finished with this thing because my patience has wore thin and so has my wallet. I'll advize my findings! Some season.
Wayneman posted 07-31-2002 10:56 AM ET (US)     Profile for Wayneman  Send Email to Wayneman     
By the way; it is a 64 Nauset not a Montauk.

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