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10-05-2009, 03:21 PM
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#1
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Lt. Commander
Join Date: Aug 2009
Location: Atlanta, Georgia, United States
Posts: 247
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Engine Alarm
Hi All,
Last weekend I left the boat running beautifully. Yesterday after pressure washing we started the boat and the alarm immediately sounded and would not go off. Oil pressure, temp (cold start) all seemed fine but obviously, I would not run it. I'm thinking and hoping that the problem may be that more water than normal has gone into the engine compartment and somehow caused the alarm to go off. thing is, I can’t for the life of me figure out what. I assume the alarm sounds when there is a problem with oil pressure, water pressure and temperature. What else will cause the alarm to sound?
As always, thanks in advance.
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10-05-2009, 04:02 PM
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#2
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Commander
Join Date: Jun 2006
Posts: 298
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Re: Engine Alarm
Quote:
Originally Posted by Cymru
Hi All,
Last weekend I left the boat running beautifully. Yesterday after pressure washing we started the boat and the alarm immediately sounded and would not go off. Oil pressure, temp (cold start) all seemed fine but obviously, I would not run it. I'm thinking and hoping that the problem may be that more water than normal has gone into the engine compartment and somehow caused the alarm to go off. thing is, I can’t for the life of me figure out what. I assume the alarm sounds when there is a problem with oil pressure, water pressure and temperature. What else will cause the alarm to sound?
As always, thanks in advance.
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Did you check your gear lube reservoir level?
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10-05-2009, 04:20 PM
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#3
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Lt. Commander
Join Date: Aug 2009
Location: Atlanta, Georgia, United States
Posts: 247
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Re: Engine Alarm
I haven’t checked that at all. To be honest, I don’t know where it is or what type of oil it takes. I just looked in the manual and there is no image of the engine or its parts location. I have the single 7.4MPI with BIII.
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10-05-2009, 04:27 PM
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#4
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Commander
Join Date: Jun 2006
Posts: 298
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Re: Engine Alarm
Quote:
Originally Posted by Cymru
I haven’t checked that at all. To be honest, I don’t know where it is or what type of oil it takes. I just looked in the manual and there is no image of the engine or its parts location. I have the single 7.4MPI with BIII.
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It's going to be a small semi-transparent plastic reservoir mounted on the front or side of the engine (I'm only assuming that the Bravo III system uses one like this as my experience is with the A1). It will have blue gear oil in it and the alarm is triggered when the gear oil falls below the minimum fill line. It is one of the more common reasons for the alarm to sound and the first place I look.
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10-05-2009, 04:33 PM
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#5
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Commander
Join Date: Jun 2006
Posts: 298
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Re: Engine Alarm
I would guess that the gear lube reservoir is the one on the port side in this picture (to the right of the 7.4 MPI decal). Your owners manual for the boat probably won't have engine pictures. Were you not given a Mercruiser owners manual? that's the one you want.
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10-05-2009, 04:37 PM
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#6
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Lt. Commander
Join Date: Aug 2009
Location: Atlanta, Georgia, United States
Posts: 247
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Re: Engine Alarm
There were no manuals when I bought the boat. It was a bank repo so thats not a surprise. I'll have to do a search for the mercruiser manual and see if I can find one. Thanks.
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10-05-2009, 10:07 PM
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#7
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Lieutenant
Join Date: Mar 2008
Posts: 59
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Re: Engine Alarm
My mechanic, who is excellent, says 9 times out of 10 it is the IAC motor when you get the intermittent alarm.
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10-05-2009, 10:54 PM
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#8
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Admiral
Join Date: Nov 2005
Location: Everett Wa
Posts: 4,681
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Re: Engine Alarm
Quote:
Originally Posted by Ticamo
My mechanic, who is excellent, says 9 times out of 10 it is the IAC motor when you get the intermittent alarm.
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ok...now I'm corn-fused...what is the iac motor??...never heard of one...
SP irate:
__________________
Don't compare your life to others. You have no idea what their journey is all about.
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Par Excellence
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2008 Bayliner 340 - "Wild Whim"
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I live in my own little world....but it's okay-they know me here!!!
Avid practitioner of the martial art: KLIK-PAO.
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Anyone that sez "Size doesn't matter" has never owned a boat!
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10-05-2009, 11:30 PM
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#9
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Lt. Commander
Join Date: Aug 2009
Location: Atlanta, Georgia, United States
Posts: 247
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Re: Engine Alarm
I guess its the Idol Air control motor but I'm not sure either.
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10-06-2009, 05:23 PM
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#10
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Lieutenant
Join Date: Mar 2008
Posts: 59
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Re: Engine Alarm
Right, Idle Air Control motor.
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10-06-2009, 06:18 PM
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#11
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Commander
Join Date: Jun 2006
Posts: 298
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Re: Engine Alarm
Quote:
Originally Posted by Cymru
I guess its the Idol Air control motor but I'm not sure either.
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So it wasn't the gear lube reservoir? I see you are from Atlanta. I spent last week there on a biz trip. Stayed in Vinings. Nice area.
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10-07-2009, 09:45 PM
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#12
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Ensign
Join Date: Sep 2009
Posts: 3
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Re: Engine Alarm
I replaced my IAC valve last month. I got the alarm (2 beeps), engine wouldn't start unless high rpms. Low oil pressure. The valve is $100 bucks. Once replaced the boat runs like new. I have 5.0MPI mercruiser.
IAC Valve - 803149 Mfr. Quicksilver by Mercury $97.12
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10-07-2009, 10:24 PM
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#13
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Lt. Commander
Join Date: Aug 2009
Location: Atlanta, Georgia, United States
Posts: 247
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Re: Engine Alarm
Quote:
Originally Posted by racer2c
Quote:
Originally Posted by Cymru
I guess its the Idol Air control motor but I'm not sure either.
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So it wasn't the gear lube reservoir? I see you are from Atlanta. I spent last week there on a biz trip. Stayed in Vinings. Nice area.
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I haven’t gotten out to the boat yet. Will probably go on Saturday and run through everything one more time before calling the mechanic.
I actually live right around Vinings. My office overlooks the village too. Where did you stay?
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10-09-2009, 03:42 PM
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#14
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Commander
Join Date: Jun 2006
Posts: 298
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Re: Engine Alarm
Quote:
Originally Posted by Cymru
Quote:
Originally Posted by racer2c
Quote:
Originally Posted by Cymru
I guess its the Idol Air control motor but I'm not sure either.
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So it wasn't the gear lube reservoir? I see you are from Atlanta. I spent last week there on a biz trip. Stayed in Vinings. Nice area.
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I haven’t gotten out to the boat yet. Will probably go on Saturday and run through everything one more time before calling the mechanic.
I actually live right around Vinings. My office overlooks the village too. Where did you stay?
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The Courtyard Marriott on Paces Ferry Rd. Had a few Guinness at Meehans across the street. In the mornings I sat in line at the Starbucks with numerous BMW's, Audi's and Jags. My rental car didn't fit in!!!
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10-09-2009, 07:30 PM
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#15
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Lt. Commander
Join Date: Aug 2009
Location: Atlanta, Georgia, United States
Posts: 247
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Re: Engine Alarm
Brilliant mate. My office is in that silver glass building just off to the right of the hotel. I can see Meehans from my window. If you're in town again, let me know and I'll buy you a pint.
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10-09-2009, 08:08 PM
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#16
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Commander
Join Date: Jun 2006
Posts: 298
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Re: Engine Alarm
Quote:
Originally Posted by Cymru
Brilliant mate. My office is in that silver glass building just off to the right of the hotel. I can see Meehans from my window. If you're in town again, let me know and I'll buy you a pint.
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Thanks! You're on!
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10-12-2009, 04:37 PM
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#17
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Lt. Commander
Join Date: Aug 2009
Location: Atlanta, Georgia, United States
Posts: 247
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Re: Engine Alarm
I just wanted to close the thread and let you guys know what the problem was. It appears that the culprit was the gear lube oil. I had not checked it since a complete service was done in late august. One thing I did learn was that if the oil is not filled properly, the reservoir appears to be full but there is air trapped that makes it appear fuller than it is. I'm guessing this is the case for me since I see no evidence of a leak anywhere. That said, I'll know to keep a better eye on it.
Thanks again to everyone that tried to help. It’s really appreciated.
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