bajabass
Super Nomad
Posts: 2016
Registered: 10-4-2006
Location: La Paz,BCS
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Mood: Want to fish!!!
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Mercury Blues!!
Does anyone near or in La Paz know a good Mercury Outboard mechanic??? I'm having an alarm issue I cannot easily sort out. Been to one, unnamed shop 3
times, water trials, new t-stat and impellar, bigger prop, run the scanner, same issues. Motor runs great, smooth, low hours. Just the darn alarm if
you even try and run over 4,000 RPM. 
Keep your eyes on the road, and your hands upon the wheel!
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Pescador
Ultra Nomad
Posts: 3587
Registered: 10-17-2002
Location: Baja California Sur
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First of all, I suspect it is your oil sending unit but it could also be the temp sender, both of which will sound an alarm.
There was a really great Merc mechanic who moved out of La Paz Marina and opened his own shop up. I think it was on like 16th of Sept. or maybe a
little further east and about 10 blocks south of the malecon.
This may be an old lead:
Mercury, Carlos Murillo, Constitucion y G. Farias
122 9033
[Edited on 10-23-2011 by Pescador]
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bajabass
Super Nomad
Posts: 2016
Registered: 10-4-2006
Location: La Paz,BCS
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Mood: Want to fish!!!
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Thanks Jim. I put a "known good' coolant sensor in, same exact issue. I'm running to California next week, and may just pull the motor off the boat
and haul it north. I'll try and contact your guy on Monday. Could just pick up a couple new sensors and pray alot!! The only codes in the computer are
for over rev, but WAY in the past. Based on that, the mech said install larger prop to cut RPM. Boat runs even better than before, planes faster,
better mid range throttle response, and cut my 20-24 mph cruise RPM from 4,800 to 4000 RPM. Until the alarm triggers
Keep your eyes on the road, and your hands upon the wheel!
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bajabass
Super Nomad
Posts: 2016
Registered: 10-4-2006
Location: La Paz,BCS
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Mood: Want to fish!!!
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Just tried the number Pescador, no go. Thanks though. Any more leads out there???
Keep your eyes on the road, and your hands upon the wheel!
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bajaguy
Elite Nomad
Posts: 9247
Registered: 9-16-2003
Location: Carson City, NV/Ensenada - Baja Country Club
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Mood: must be 5 O'clock somewhere in Baja
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Google is your friend
Search Google for "Mercury Outboard Alarms" and see what you get.
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Diver
Ultra Nomad
Posts: 4729
Registered: 11-15-2004
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Have you tried Hector ?
His shop is at the corner of Abasolo and Miguel de Legaspy, near the marina and next to a boat supply store.
He has fixed many motors for me over the years.
He is college-educated and speaks good english with a heavy accent.
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Russ
Elite Nomad
Posts: 6742
Registered: 7-4-2004
Location: Punta Chivato
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If you take it across the boarder without the boat they'll get you on duty when you return. Just something to consider...
or try this http://www.thenextbite.com/node/2407
Bahia Concepcion where life starts...given a chance!
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Jack Swords
Super Nomad
Posts: 1095
Registered: 8-30-2002
Location: Nipomo, CA/La Paz, BCS
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Was that Carlos of "Waterworks" that moved out of the marina?
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Diver
Ultra Nomad
Posts: 4729
Registered: 11-15-2004
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From the above website:
Re: mercury optimax overspeed alarm at 4000
For anybody else in the future experiencing this overspeed alarm at 4000rpm
I have two 2006/2008 Optimax 90's on a 6.5m Delta RIB, and was given this overspeed alarm a few weeks ago. It would come and go and was inconsistent
but slowly got worse and worse.
I had gone through a series of troubleshooting ideas. Fuel flow, water pressure, but ended on the Neutral Switch Sensor, which is located around the
starboard side of the engine leading underneath the 2stroke oil tank. It is nearly impossible to access it without taking off the lower unit cowling,
and lifting the oil tank up. This switch tells the computer that it is in gear, or else it will limit your revs whilst in neutral, without this
functioning switch, there is no analog way to bypass it and achieve full power.
I fortunately have a spare engine which I was able to switch out this Neutral switch sensor and problem was solved immediately. It is a tiny black
box, with two black cables, and a grey pin which when suppressed, tells the engine that it is in gear, allowing it to pass 4000rpms.
Now hoping Mercury will stand by their warranty and send me a replacement so i can have a spare, just in case.
In retrospect, it seems entirely trivial to have this sensor. Note: optimax are also equipped with a TPS- Transmission position sensor which ALSO
tells the engine when it is in gear. If you disconnect this cable, you can start your engine but will not have any response if you attempt to put it
into gear. What is the point of having both of these sensors? There are too many sensors on modern engines. If you dont own a diagnostic computer, or
perhaps a spare engine, there is almost no way of troubleshooting or eliminating options if there is a fault in a sensor.
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Cypress
Elite Nomad
Posts: 7641
Registered: 3-12-2006
Location: on the bayou
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Mood: undecided
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Why the heck do they add all these "sensors"? Sensors? Hell, if the motor isn't running right I don't need a sensor to tell me. It's got to be fuel,
temp. or the lower unit. Now we need to wonder if the "sensor" is
malfunctioning.
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bajabass
Super Nomad
Posts: 2016
Registered: 10-4-2006
Location: La Paz,BCS
Member Is Offline
Mood: Want to fish!!!
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Diver, this is a 60 HP 4-Stroke EFI motor. I have no idea if the 2 stroke Optimax uses the same sensors. I'll pull the side cowling a look around.
Keep your eyes on the road, and your hands upon the wheel!
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Bob and Susan
Elite Nomad
Posts: 8813
Registered: 8-20-2003
Location: Mulege BCS on the BAY
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Mood: Full Time Residents
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remember if you take it north...
a boat motor without a boat is harder to cross than a boat with a motor attached....
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bajabass
Super Nomad
Posts: 2016
Registered: 10-4-2006
Location: La Paz,BCS
Member Is Offline
Mood: Want to fish!!!
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Yeah, I really don't want to haul it, or the boat and motor north or south again.
Keep your eyes on the road, and your hands upon the wheel!
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Barry A.
Select Nomad
Posts: 10007
Registered: 11-30-2003
Location: Redding, Northern CA
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Mood: optimistic
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| Quote: | Originally posted by Cypress
Why the heck do they add all these "sensors"? Sensors? Hell, if the motor isn't running right I don't need a sensor to tell me. It's got to be fuel,
temp. or the lower unit. Now we need to wonder if the "sensor" is
malfunctioning. |
------you just identified why I LOVE my 1964 Johnson, and my 1978 Johnson------------NO SENSORS, and other do-dads that make decisions for me, and
block what I want my motor to do--------drives me nuts on these newer motors. Both my old motors are a cinch to keep running right, and have
adjustments in plain sight that even a squirrel could figure out. Even my 1988 Mercury makes too many decisions for me, has no obvious 'adjustment
knobs' and I can never find what is wrong with THAT motor. It has idl'ed rough, and always died at idle speed even at 800 rpm's, all it's life and
NOBODY can figure out why, so far, let alone ME.
I am beginning to think that IFlyFish is right, and the "corporations" are out to bamboozle us so that we CAN'T fix anything any more.
Drives me nuts!!!!
Barry
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Cypress
Elite Nomad
Posts: 7641
Registered: 3-12-2006
Location: on the bayou
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Mood: undecided
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Mercury outboards have always been faster, more fuel efficient and lighter than Johnsons or Evinrudes. The throw-out clutch was better than the
shear-pin. However, I'd take a Johnson or Evinrude any day over a Mercury. The reason? If you have problems with a Mercury, you've got a big problem.
Johnsons and Evinrudes? You might just be able to fix 'em yourself.
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bajabass
Super Nomad
Posts: 2016
Registered: 10-4-2006
Location: La Paz,BCS
Member Is Offline
Mood: Want to fish!!!
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Thanks Pescador! I'm headed to California Friday, I'll talk to a couple dealers, buy a couple sensors, sacrifice a virgin or two, and maybe I will get
lucky. This motor is immaculate and low hours, has been GREAT until
this. Probably a simple problem, but communication at the shop here is tough!!
Keep your eyes on the road, and your hands upon the wheel!
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