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    Optimax 175 Fuel Filter

    Contaminated fuel, need to clean out fuel filter. Can't find accurate reference publication. Which is the Fuel Filter in the picture? Cleaned out water separator, it was 60% H2O (see pic). Line also seems to be clogged. Fuel ball won't get full, and the ball was just replaced (it worked...
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    2007 Optimax 175 blowing 20 amp fuse

    Greetings, 2007 Mercury Optimax, 175 hp, on a 2007 21' Trophy. Took the boat out today. Has been running great past couple months. Long run at Idle, then slowly accelerated. Just as boat began to plane, engine quit cold. Cranks over, but no combustion. 4 fuses are in the engine compartment, 1...
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    Lowrance HDS-7 to VHF NMEA 2000

    Re: Lowrance HDS-7 to VHF NMEA 2000 Yes, I just assumed that the instructions were referring to NMEA 2k. All this is new to me. Seems like it would be easier to get the GPS location to the VHF. I have attached a photo of the Cobra instruction page. Instructions refer to the Red connecting to...
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    Lowrance HDS-7 to VHF NMEA 2000

    Have a 2007 Lowrance HDS-7, which has an unoccupied NMEA 2k slot. I have purchased a Cobra VHF with GPS input. Instructions are to come out of the GPS (Lowrance) with NMEA 2000 cable. Connect to this NMEA cable with a red wire and black wire that attached to a plug that fits in the back of the...
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    2007 Optimax Specifications Please

    Greetings, I just purchased a 2007 Trophy 2002 wa, with a Mercury Optimax 175. I believe it is the OTNG Optimax, because it has the 'stylized globe' decal on the engine cover. I would like to find a list of expected Engine Temps (idle, etc), pressures, oil usage, etc. And any advice. I...
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    rebuilding transom

    1988 OMC Cobra, Bayliner Ciera Sunbridge. Small leak in transom since I bought the boat. I have some days off, and it's cold outside so I wont' be using the boat. I would like to tackle the transom leak. I took the drive off, and there is water in the bellows that surround the drive shaft...
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    Built Ignition Interrupt Circuit

    I have had recurring difficulty with shifting with a 1988 Bayliner Ciera, OMC 4 cylinder. I know this is a fairly common problem. In and out of the shops (more than 1), working on it myself, all the frustration! Mechanically, the outdrive and engine are great. The problem has always been...
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    Stuck Valve 3.0l OMC

    I actually had a complete valve job about a year ago, maybe less. Engine started running rough 2 days ago, just while I was warming it up at the house, getting ready to take the boat out. When I started it, it ran, but rough. In fact I just started it a few minutes ago, with the valve cover...
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    Metal shavings in Distributor Cap

    1988 Bayliner With OMC 3.0L 4 cyl. Boat has been running well. Went to warm it up today before taking it out. It was running rough, and loud. The engine was vibrating, like it was out of balance, like maybe it was misfiring. The timing has been fine until now. I pulled the plugs, they looked...
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    Change OMC ignition interupt

    1988 bayliner ciera with OMC 3.0L. Ignition interupter is not so great. Replaced the switches, and the ESA module. Local marine mechanic said most people he knows just disconnect it. Did this, but it doesn't like coming out of gear. Had this idea ( I know) about using the ignition interupt...
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    OMC Cobra Inspection hole, Port Side

    Recently serviced 1988 OMC Cobra on a 3.0L 4 cylinder. The shop replaced a mildly bent shift rod. They also sealed up the inspection hole on the Port Side of the Upper Unit, because they said it had a small leak out of it. While boating, Engine started getting hot. We determined that there...
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    Cleaning Fuse Block?

    Removed a tarnished fuse block from my 1988 Bayliner Ciera. It was making bad connections, but only due to tarnish. I'd like to make it as clean as possible before reinstalling. Any reccomendations on cleaning it? I used sandpaper on the 'easy to get to' spots. Tried Isopropryl alcohol...
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    OMC starts, then won't, instruments go out

    1988 OMC 3.0L 4 cyl. Bayliner Ciera 2155. Engine ran great. Checked the ignition switch, and it is fine. Now, when I turn the key, the instruments won't light up, and nothing from the starter. Then, totally at random, everything lights up and I can start it. After it ran for a minute or...
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    OMC ESA and Alternator wires

    1988 Bayliner Ciera, 3.0L OMC cobra. Runs great. Shifts well. The ignition interrupter isn't, well, interrupting, but it used to. New interrupter and over shift switch. New ESA. Here is what I think the problem is, and it shows a little ignorance on my part. I had the alternator rebuilt awhile...
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    Engine to Instrument harness question

    Hi, 1988 OMC 3.0L with Cobra outdrive. In short: Which wires come out of cable connector in line with the feed from the Assist Solenoid? Long expalnation, if you have the time: If I touch either of the 2 battery grounds to the block, like the groudning point, It sparks. Well, there shouldn't...
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    Bolt turns up in bilge

    Hi, 1988 OMC Cobra with 3.0L. Engine used to have a very faint, weird vibration sound at 2200rpm. Now it's gone. Bilge is spotless. Now I find a 4" long 1/4" bolt that is snapped at the threads. It is just lying in the bilge, against the transom. Unique Identification is that it has...
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    Keep it or Sell it??

    abc
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    engine rattle @ 2200 rpm, then disappears?

    1988 OMC 3.0l, 4 cyl with OMC Cobra outdrive. Newly rebuilt outdrive, New valve job, runs great (seems to). The engine makes this weird rattle, almost like a buzz, at 2200 rpm, then goes away at like 2300. It then reappears at around 3200 rpm, and goes away at like 3300. It sounds like a...
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    OMC 50 amp fuse keeps blowing

    Had the alternator rebuilt, and everything worked well during short engine run. Alternator produced 13 volts. Went to restart it today to get ready for the water. No voltage at all. Upon inspection, found top 50 amp fuse blown. There are 2 on back of engine. Replaced it, and it blew again...
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    1988 omc electrical / starting

    Cannot get power to coil. Engine turns over, so there is power to starter. Engine will start and run great if I jump the battery directly to the coil. I've installed New Electronic Shift Assist. I've tested continuity on my New ignition interuptor and overshift switches (installed prior by...
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