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  1. G

    Leak into bilge, bellows?

    I'm a bit confused on the correct repair kit part number. Some sites list this as only for 91-97 serial number gen ii's, but the Mercruiser catalogue has the same kit ("bearing repair kit") under the 98 and up as well. I can see the main gasket has the oil reservoir hose hole in it.
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    Timing is retarded ;-)

    Cyclops are you thinking I just got a bad new part?
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    Leak into bilge, bellows?

    Thanks y’all, agreed. I had already pulled the outdrive and replaced impeller, as well as a couple of melted parts (oil seal carrier and water tube) in the outdrive. I inspected the bellows visually at the time, but didn’t catch this leak. Can’t be too surprised that 10 year old bellows leak...
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    Leak into bilge, bellows?

    I was able to confirm today using a borescope that the leak is indeed the shift cable bellows. It only leaks noticeably when the trim is up. I also noticed some backflow through the bilge pump when the water laps up, I think I’ll be installing a check valve (and a float valve, as I learned there...
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    Timing is retarded ;-)

    I installed a new ignition module today and tested it on the timing light. I got identical results as before. I’m kind of stumped as to why it’s not advancing as much as it should.
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    Prop Selection - Bayliner 175

    That last part about the 3.0 is where my mind was going. I guess by sticking with 3 blades I should just expect slip numbers on the higher end and be satisfied with that given the motor. Not necessarily a target, but to be mindful that I won’t find a “magic” prop that performs well...
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    Prop Selection - Bayliner 175

    So when I get my 19P black diamond tested out, i should have a much better baseline to start from. That being said, as I do further prop testing, given the power limitations of the 3.0L, does it make sense that I should be targeting the higher end of the slip range? Like something closer to 20%...
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    Prop Selection - Bayliner 175

    So these two props are 15-1/4" diameter. Does 15-1/4" fit an Alpha 1 (to clear the cavitation plate that is)? If it does fit, would that diameter perhaps be too large for the 3.0L to turn efficiently?
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    Prop Selection - Bayliner 175

    @Scott Danforth What prop brand/model did you run on your 15P 3 blade? All I can seem to find in a 14-1/2" diameter 15P 3 blade (and 4-3/4" gearcase) are some older Vengeance/Silverado SS props. I was hoping to find some aluminum props (due to lower cost, but also making the prop the sacrificial...
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    Prop Selection - Bayliner 175

    I'm with you on that. I expect the right prop will make a dramatic performance improvement, and hopefully the new ignition module will correct the timing advance. I'm probably going to perform a leak down test as well, mostly because the discoloration on the #2 plug has me wondering about the...
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    Prop Selection - Bayliner 175

    I compared the compression tester gauge on my air compressor to another gauge at 150 psi and both were within 2-3 lbs of each other, so it appears to be fairly accurate.
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    Prop Selection - Bayliner 175

    Although I'm still fairly new to this motor and learning it, my understanding is that the technology is pretty basic from the late 90's, despite being a 2015 production year. My understanding is that there is no knock sensor (and I have not audibly observed knock either). This is a carbureted...
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    Prop Selection - Bayliner 175

    I see a minimum psi of 100 specified in the PSI 3.0L engine manual, but not a maximum. The Merc manual doesn't seem to have anything on compression testing. The high pressure could possibly be caused by excessive carbon buildup on the rings and/or valves. What do y'all think about sea foam...
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    Prop Selection - Bayliner 175

    The motor seems to be running very well. Fires right up, idle is solid, and spins up smooth. The one motor issue I know I have is the timing advance at 3000+ rpm is 4* less than called for in the manual (base and initial timing are correct). New ignition module is on the way which will hopefully...
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    Prop Selection - Bayliner 175

    Yes sir, gapped to spec.
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    Prop Selection - Bayliner 175

    The yellowish buildup on #2 was what caught my eye as well. Since it's only on one cylinder I'm thinking perhaps there's a valve seal issue on that cylinder. I'm not sure what you mean by hazy look on all surfaces... I'm not seeing that. Could you be more specific? I make it a habit of putting...
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    Prop Selection - Bayliner 175

    Can you describe what it is you are seeing that indicates detonation on #4? I can see one blurry black spec if i zoom in really close, but doesn't look like "peppering" to me.
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    Prop Selection - Bayliner 175

    These are the plugs the manual calls for: BPR6EFS 3623 which is heat range 6 (medium heat). Perhaps a leak down test is in my future. No signs of water in the old oil, when I pulled the exhaust/intake manifold it was in good condition.
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    Prop Selection - Bayliner 175

    Can you pls explain why you think this? Would you expect more carbon buildup after only one hour of runtime?
  20. G

    Prop Selection - Bayliner 175

    No signs of water in the motor when I changed the oil. Other than cylinder 2, the plugs look normal to me. What are you observing that makes them look steam cleaned? Remember these plugs are nearly new, only one hour on them.
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