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Optimax 225 problem
#13637093
07/20/20 03:59 PM
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Joined: Feb 2006
Posts: 4,045
bronco71
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Have not had a chance to look at it yet but wanted to get some ideas to see if I need to add to my list of things to check. Was cruising about 55mph when lost some power and got a continuous beep with no red lights on gauge. Stopped immediately and beep stopped at idle. Water pressure was 15 psi @55mph, 10 psi when moving slower and 5 to 7 at idle with good P stream. Fuel tank 1/2 full with non ethanol gas. Reserve oil tank over 1/2 full with Merc DFI oil. This was a continuous beep, not the 4 beeps like low oil. Guardian reset when I pulled back to neutral and I headed back to ramp. Ran pretty far once with no alarm so stopped to fish, next time it did it again just as I got near the ramp, only seems to do it at higher rpm.
I plan to check/clean/change fuel filter, top off reserve oil tank and check engine mounted oil tank. Another issue that I have had since I got this boat is that the voltmeter reads 12v with power off and pegs at 16v when power is on....batteries read 12.6v sitting and around 14v with motor running. I plan to check the voltage and the gauge better as I have read that over 16v will cause the Guardian to kick in even though it has not happened before....
also! Only normal 1 beep when starting....
Last edited by bronco71; 07/20/20 04:01 PM.
1987 Nitro MX185/Mercury Black Max 150 (needs lots of work, put motor on nephew's boat) 1994 XSC-2200 "Jaguar" AKA Shadow 22 Magnum (restoring w/Mercury 200 XRI) 1994 Pantera II (restoring w/Mercury 200 EFI) 1999 Triton TX21/225 Mercury Optimax
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Re: Optimax 225 problem
[Re: bronco71]
#13645107
07/26/20 05:25 PM
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Joined: Feb 2006
Posts: 4,045
bronco71
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update: removed spin on fuel filter and drained into glass jar....no water. Replaced with new filter/sensor. checked voltage at battery, just unplugged charger - 13.6v checked voltage at back of gauge an hour later, key off = 0v gauge reads 12v key on = 12.4v gauge pegged at 16v; ordered new gauge will check voltage with engine running after I install new gauge. engine oil tank full, remote tank half full, topped it off.
1987 Nitro MX185/Mercury Black Max 150 (needs lots of work, put motor on nephew's boat) 1994 XSC-2200 "Jaguar" AKA Shadow 22 Magnum (restoring w/Mercury 200 XRI) 1994 Pantera II (restoring w/Mercury 200 EFI) 1999 Triton TX21/225 Mercury Optimax
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Re: Optimax 225 problem
[Re: bronco71]
#13645411
07/26/20 10:11 PM
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Joined: Jul 2012
Posts: 524
PhishWhisperer
Pro Angler
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A continuous alarm indicates overheat. If you are sure the engine is not overheated then you might have a defective sensor. You can easily check this with a voltohm meter.
Last edited by PhishWhisperer; 07/26/20 10:37 PM.
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Re: Optimax 225 problem
[Re: bronco71]
#13646284
07/27/20 04:55 PM
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Joined: Feb 2006
Posts: 4,045
bronco71
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1987 Nitro MX185/Mercury Black Max 150 (needs lots of work, put motor on nephew's boat) 1994 XSC-2200 "Jaguar" AKA Shadow 22 Magnum (restoring w/Mercury 200 XRI) 1994 Pantera II (restoring w/Mercury 200 EFI) 1999 Triton TX21/225 Mercury Optimax
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Re: Optimax 225 problem
[Re: bronco71]
#13646764
07/27/20 11:01 PM
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Joined: Jun 2004
Posts: 1,509
OPTI
Extreme Angler
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On the port side of engine on the adaptor plate there two nipples one brass and one white plastic nipple the brass nipple is your air dump and the plastic is your water filter screen for the cooling water for fuil rails and air compressor. I have seen these filters get clogged with pee gravel and grass and moss if it clogs it will cause air compressor to overheat. Remove port lower cowl to access nipple the hose on nipple goes to bottom of fuel rail. Remove hose from nipple and unscrew nipple and check for blockage. Hope this helps. OPTI
Last edited by OPTI; 07/27/20 11:01 PM.
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Re: Optimax 225 problem
[Re: bronco71]
#13646801
07/27/20 11:25 PM
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Joined: Feb 2006
Posts: 4,045
bronco71
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1987 Nitro MX185/Mercury Black Max 150 (needs lots of work, put motor on nephew's boat) 1994 XSC-2200 "Jaguar" AKA Shadow 22 Magnum (restoring w/Mercury 200 XRI) 1994 Pantera II (restoring w/Mercury 200 EFI) 1999 Triton TX21/225 Mercury Optimax
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Re: Optimax 225 problem
[Re: bronco71]
#13647094
07/28/20 02:45 AM
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Joined: Dec 2008
Posts: 17,869
grout-scout
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When mine did this, it ended up being the motor mounted oil reservoir sensor. My pump was still working, but the sensor was saying otherwise.
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Re: Optimax 225 problem
[Re: bronco71]
#13647104
07/28/20 03:00 AM
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Joined: Feb 2006
Posts: 4,045
bronco71
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Thanks, a couple months ago I got the 4 beeps every 2 minutes and a red light on the oil gauge which means oil related and the tank on the motor was low but the remote tank was full. There was an air leak in the fill hose from the deck to the remote tank causing the system to lose prime, I fixed that and it has worked fine since then. This beep was a continuous beep and no red lights come on the gauge for oil or temp and it stops when I decrease rpm. I installed new voltmeter today and readings are good, I'll check for the things in Opti's post next and if no obstructions I will probably check thermostats to see if one or both are stuck open causing the engine to run too cool.
1987 Nitro MX185/Mercury Black Max 150 (needs lots of work, put motor on nephew's boat) 1994 XSC-2200 "Jaguar" AKA Shadow 22 Magnum (restoring w/Mercury 200 XRI) 1994 Pantera II (restoring w/Mercury 200 EFI) 1999 Triton TX21/225 Mercury Optimax
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Re: Optimax 225 problem
[Re: bronco71]
#13649735
07/30/20 01:17 AM
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Joined: Feb 2006
Posts: 4,045
bronco71
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are these the hoses that I need to remove to check for debris? I don't see a white plastic nipple, both look brass... ![[Linked Image]](https://texasfishingforum.com/forums/pics/userpics/2020/07/full-15513-61424-20200729_195333.jpg)
1987 Nitro MX185/Mercury Black Max 150 (needs lots of work, put motor on nephew's boat) 1994 XSC-2200 "Jaguar" AKA Shadow 22 Magnum (restoring w/Mercury 200 XRI) 1994 Pantera II (restoring w/Mercury 200 EFI) 1999 Triton TX21/225 Mercury Optimax
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Re: Optimax 225 problem
[Re: bronco71]
#13649780
07/30/20 01:58 AM
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Joined: May 2003
Posts: 11,586
gary purdy
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I am surprised no one has said anything about the half full motor oil reservoir. That will set off the alarm. You need to check why enough oil isn't being fed to the motor tank. That beat up hose has the screen for the compressor cooling hose.
The world will not be destroyed by those who do evil, but by those who watch them without doing anything. Remember what He has done and remember that He is not done yet!-- GOD IS GOOD
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Re: Optimax 225 problem
[Re: gary purdy]
#13649788
07/30/20 02:05 AM
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Joined: Feb 2006
Posts: 4,045
bronco71
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I am surprised no one has said anything about the half full motor oil reservoir. That will set off the alarm. You need to check why enough oil isn't being fed to the motor tank. That beat up hose has the screen for the compressor cooling hose.
Thanks, the reservoir on the motor is full, the remote tank in the boat was over half full. I'll pull that hose and check the screen!
1987 Nitro MX185/Mercury Black Max 150 (needs lots of work, put motor on nephew's boat) 1994 XSC-2200 "Jaguar" AKA Shadow 22 Magnum (restoring w/Mercury 200 XRI) 1994 Pantera II (restoring w/Mercury 200 EFI) 1999 Triton TX21/225 Mercury Optimax
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Re: Optimax 225 problem
[Re: bronco71]
#13652141
07/31/20 10:10 PM
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Joined: Feb 2006
Posts: 4,045
bronco71
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 the beat up hose has a bad end and is too short to cut back. I pulled the fitting and the large fitting next to it to clean and there was no screen anywhere? Tried to pull the hose off of the fitting going into the port fuel rail after loosening the clamp and the whole @%%#$ fitting pulled out of the rail, was only threaded in a bout 1 1/2 threads. Threads on fitting are 1/8" pipe, most of the threads in the hole look like they are much coarser. So I go to Mercury for a fitting to see what is supposed to be in there and some air pressure hose and they are NO LONGER AVAILABLE 
1987 Nitro MX185/Mercury Black Max 150 (needs lots of work, put motor on nephew's boat) 1994 XSC-2200 "Jaguar" AKA Shadow 22 Magnum (restoring w/Mercury 200 XRI) 1994 Pantera II (restoring w/Mercury 200 EFI) 1999 Triton TX21/225 Mercury Optimax
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Re: Optimax 225 problem
[Re: bronco71]
#13655026
08/03/20 07:05 PM
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Joined: Feb 2006
Posts: 4,045
bronco71
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Does anyone know what thread size is stock for the air dump barb fitting coming off of the port fuel rail on a 99 Optimax 225? Since the hose is clamped on it should be 300 psi or less and I can use 1/4" air brake line but since someone decided to replace the barb fitting with a 1/8" pipe fitting and it only screwed in a couple of threads and now pulled out and Mercury doesn't sell the fitting anymore I need to either try to tap it for 1/8" pipe and hope it holds or go to an M10 size but I am not sure of the pitch in order to find a barb fitting to use. I'm sure this has been done in shops before since Mercury doesn't offer the fitting anymore. If I can find out the correct thread in the fuel rail I could even build a high pressure crimped hose as I have a hose crimping machine...
1987 Nitro MX185/Mercury Black Max 150 (needs lots of work, put motor on nephew's boat) 1994 XSC-2200 "Jaguar" AKA Shadow 22 Magnum (restoring w/Mercury 200 XRI) 1994 Pantera II (restoring w/Mercury 200 EFI) 1999 Triton TX21/225 Mercury Optimax
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Re: Optimax 225 problem
[Re: bronco71]
#13660877
08/08/20 09:34 PM
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Joined: Feb 2006
Posts: 4,045
bronco71
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1987 Nitro MX185/Mercury Black Max 150 (needs lots of work, put motor on nephew's boat) 1994 XSC-2200 "Jaguar" AKA Shadow 22 Magnum (restoring w/Mercury 200 XRI) 1994 Pantera II (restoring w/Mercury 200 EFI) 1999 Triton TX21/225 Mercury Optimax
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