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    marine engine mystery

    Have never experienced it myself but have heard reports of clutch slippage when using high perf lube in place of GL-5 in SX/A model drives AQ will run pretty much anything proper weight save for the old single prop which uses 30 wt motor oil
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    Alpha drive for a V8 whats the ratio?

    True that....... OP hasn't given us much feedback and I have read many threads about alpha drive swaps where information provided includes using a different ratio than was used oem. User is informed they should use a different prop to get the performance close enough to work OP is a vice...
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    Alpha drive for a V8 whats the ratio?

    Yes R/MR/Alpha One were only offered in 1.50, not 1.47 Gen 2 had both ratios available I reread OP and see 1988 which would be in the vintage of Alpha One and if oem wouldn't be available in 1.47. Guessing OP is looking at a gen 2 for replacement which wouldn't work on an Alpha One bellhousing
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    Alpha knocking noise video.

    Could be, but..... I agree with bondo's post in one of the threads you hijacked, most likely crank/rod bearing(s). Ime with a confirmed (drive removed) engine noise/knock as prominent as yours the issue most often is a lower end bearing Either way the motor needs to come out and further...
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    Water in gearbox

    Agree w/Kenny. Oil cooler may have ruptured/corroded allowing sea water to enter transmission Only other way water can enter is through a seal and if the transmission output flange isn't submerged its unlikely to occur this way
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    2012 115 four stroke runs fine then dies

    Troubleshoot the starting/electrical systems Aside from dying randomly what other poor running symptoms does the motor have?
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    Opinions on 1977 mercury thunderbolt110 9.8 hp

    Mercury (still in business) has better support for parts/service info than omc. You ought to be able to source parts rather easily for your mercury motor, omc stuff is getting harder to find these days
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    Mercruiser 3.0 starter

    With a serial number range and oem vintage pictures on epc Can be confusing to verify w/o parts in hand
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    Mercruiser 3.0 starter

    Bracket in question is for maintaining leverage with starter motor engagement. Most commonly found with starters having straight bolt pattern for mounting. Guessing referenced info may have now superceded
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    Engine was Full of Clear Fluid when I drained oil

    Clear fluid in a boat engine might be water. My guess is based on provided info with regards to a clear fluid and casting plug "removal" you own a freeze damaged engine and have the project you're looking for. Best method for removing oil sludge from an engine ime is swapping one quart of oil...
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    oil injection on circa 1989 Sea Ray 100

    There's no reason to abate the oil injection system if it works, however, if it's oil injected I'd be suspect only of age of system vs use Most common failure of the oil injection system I'm guessing your motor has based on sea ray branded merc outboards has a fibre cog that drives the oil...
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    Alpha drive for a V8 whats the ratio?

    same...ish Exact ratio is (example) 1.47 engine revolutions per 1 (one) revolution of propshaft. Again, only caveat I have is if using the same prop it's best to determine the engine isn't consuming itself from too much timing advance
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    Mercruiser 3.0 starter

    https://forums.iboats.com/threads/how-to-troubleshooting-your-engines-starting-system.166663/ Based on provided info the mercury part number for the correct starter is 863007A 1
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    Alpha drive for a V8 whats the ratio?

    Reason for difference is the ratio in the gear case. 1.47 will swap fine for a 1.50 and vice versa. Is more important for twin setups to have exact ratio however with the difference being close enough it should work okay. Only item I'd verify with an increase of ratio is total advance of...
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    1979 Merc 7.5hp oil mix

    Is dis a model 75? If so, that's a sweet lil putter, backtrolling perfection Don't be using that wally world oil in it
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    Idle rpm 3.0 chev

    If it's a cobra granny shifting is way more detrimental to the pinion gear than the clutch I've no clue for stringers, haven't seen one for a minute. Do know the electric shift is smooth on equipped models, behind a Ford is the smoothest shift I've ever had on a sterndrive Posted advice is...
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    OMC 460 backfire under load

    Sounds to me like the jets are too small. 650 could be fine for a 460 with the right jets. Fords are thirsty motors, maybe better off with a 750 in the end I would do a plug burn to determine proper jet size
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    Trim/tilt issue 1996 Volvo Penta DP

    1. Volt/ohms test 2. Jump the control wires, green down, blue up. Reverse polarity to test up and down 3. Maybe, could also supercede to a different pump assy 4. Depends on the tilt/trim model. Some AQ style systems have a trailer switch, most just use a gauge with no limit. SX uses no limit...
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    Changing upper oil seal in Mercruiser alpha one

    If you indeed have the older style bearIng/gear set WITH the spacer (as outlined in post #8 of this thread) there is no need to check the rolling torque unless you want to.
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    Oil drain line question

    According to merc product guide you need 32-865277A02 oil drain kit for 1/2 - 20 oil drain plug threads The part numbers you posted aren't complete but correlate with an M12 threaded oil drain plug
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