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ContinuousWave: Whaler Repairs/Mods
Foul Forty Mercury
|Author||Topic: Foul Forty Mercury|
posted 05-26-2002 02:21 PM ET (US)
Hello all in whalerland. Before I turn the abobe motor into a nice boat-anchor, I was hoping someone could help me. After the motor is warm, one cylinder starts to drop out and then the thing tries to quit altogether. As soon as it is put in gear, it dies. It will only run at high throttle settings. I have replaced the switch-box and the plugs. The motor itself was rebuilt not long ago and ran fine untill last Oct when this problem became apparent. Any ideas please?!
posted 05-26-2002 02:27 PM ET (US)
By the way; it is a 1981 Mercury 40 that was well cared for.
posted 05-26-2002 04:27 PM ET (US)
I had a Merc 40 of similar vintage on a 13 with the same symptoms. It was an ignition problem (can't remember if it was coil, powerpack or what) but it took a major Merc/Whaler dealer 4-6 weeks to get the parts and finally repair it. When I got the bill, I discovered I would have been better off looking for a used motor. It's a good thing those 13's are pretty easy to row....
posted 05-26-2002 08:19 PM ET (US)
I would check for a cracked coil. We had the same kind of problem and I think that is what it turned out to be.
posted 05-27-2002 07:03 AM ET (US)
I had the same motor, same problem. Was weak stator, the electrical "charging" system that provides voltage to coils and all. It is located under the flywheel, and was reasonably easy to replace once the flywheel was off. Cost was $150 in parts. Labor was free. I work cheap. Mav
posted 05-27-2002 02:07 PM ET (US)
Wayneman, Possibly you could put an induction type timing light (clamps on the high tension wire) and run the motor looking for ignition dropouts (light stops flashing or intermitant)... Just a thought, before you spend bucks replacing stuff...
posted 05-28-2002 10:15 AM ET (US)
What model mercury are these problems associated with? I have a merc 402 that i haven't had any problems with yet, well at least in the three years that i have had the boat.
posted 05-31-2002 12:50 AM ET (US)
Thx all who replied. I think I shall give the thing one more trip to the shop for repairs. It died again today and I had to paddle in. But I was with the tide so no biggie. By the way; the engine is 1981 Merc 40 hp which had been rebuilt.
posted 05-31-2002 11:42 AM ET (US)
As most know, I'm a diehard Mercury fan, but that old 2 cylinder 35/40HP was one of the worst engines they ever made if you ask me. It's the reason I overpowered my 1958 13' Sport. I needed a new engine way back in 1970, and the dealer told me to avoid the Merc 2 banger 35HP, so I went up to the 4 cylinder 50HP. Huge difference.
posted 05-31-2002 10:57 PM ET (US)
edz, that is exactly how you do it. if it is a pull start engine without a battery you can STILL do that if you use a "shop" 12v battery. the intermitant spark WILL show up on the light. a great manuver. i learned it from a tired old man that repaired outboards most of his born days, heres to you jake!!! steve out.
posted 05-31-2002 10:59 PM ET (US)
do a compression test also!!! even if it was recently rebuilt. sometimes especially if it has recently been rebuilt....steve out.
posted 06-04-2002 08:34 AM ET (US)
Hi guys. It is an electric start and it has excellent compression. I think it will end up being the stator. It's at the shop now. I did not have a flywheel puller nor the inclination or time to putz with it again. I think I will seriously put some effort in trying to locate a used motor in the 70-90 hp range. I borrowed a friend's whaler with an old 88 on it and it became airborne as soon as I hit the throttle!
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