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    knocking sound in lower section of engine cowl, above lower unit.

    i have this 2013 yamaha 90hp that has a knockign sound in the area above the lower unit, i recorded it an here is a video. https://photos.app.goo.gl/zsi6hj8K7PGB4Ewa7 i pulled the lower section and the noise is no longer present and i spection found that the driveshaft is 1: rusty 2 has a...
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    loss of power over 3500 RPMS FYI

    yes as stated above : "i would run the engine with an external fuel tank and it would operate properly."
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    loss of power over 3500 RPMS FYI

    no, i did not
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    loss of power over 3500 RPMS FYI

    yes, before going to the external tank, i always run the boat with the gas cap off to test,
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    loss of power over 3500 RPMS FYI

    one was a 5.7, one was a 4.3, one was a 3.0, one was a 5.0 its not the engine that has the issue, its the delivery system,
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    loss of power over 3500 RPMS FYI

    i have come across this issue about 4 times this summer and wanted to post it here in case others are experiencing this issue. boats would run great at idle and under load but when you climb over 3500 the engine would bogg down and stall. and may keep running if you pull back on the throttle...
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    Oil in bellows questions…

    the 2 types of yokes can be identified by the color of the yoke black or grey. #9 864281A 2 UNIVERSAL JOINT (1 required per assembly) (Black) GKN Assembly #10 853635 YOKE, Gear End (1 required per assembly) (Gray) Meritor Assembly i have used SEi parts for years and i can say...
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    where to connect vaccum gauge?

    im sure you dont have a fitting either. the torch will probably cost as much as the brass fitting.
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    I'm stumped, overheated 4.3 MPI, water in oil, replaced heads, still water in the oil

    i don't know why your so hostil on these posts. do you think i want to be here? do you think i want a problem like this lingering? im trying to gather as much intel before i make my next move. for some reason from the 2nd post on, i feel you've been attacking me for asking opinions and...
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    I'm stumped, overheated 4.3 MPI, water in oil, replaced heads, still water in the oil

    you think MERCRUISER makes their own gaskets? the engine is virgin, never been opened up prior to this incident. 356 hours on a lake boat so it is highly improbable that the block is rotted. other than visual inspection ,i did not do anything with confirming the block is ok. i did note...
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    I'm stumped, overheated 4.3 MPI, water in oil, replaced heads, still water in the oil

    who do you suggest if not felpro?
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    I'm stumped, overheated 4.3 MPI, water in oil, replaced heads, still water in the oil

    im not looking to offend you, i took your info and called the machine shop, and im just thinking out loud. i guess my next move is to pull the intake and check for leaks otherwise, im looking at engine replacement. this forum is to gather info, some good, some bad, some crazy, and sometimes...
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    I'm stumped, overheated 4.3 MPI, water in oil, replaced heads, still water in the oil

    hmm, well it has the plastic gaskets, new bolts and torqued properly. i spoke to the machine shop and they only tyook of 5 thousands of an inch,. not enough to through off the angle. also ,if the intake was not sitting properly, i would think it would run rough or idle high, like a vacuum leak
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    Confused about these parts

    those are roller bearings, not gimbal bearings. those are inside the drive, in the upper section. as wellcraft stated, there are 3 types., i tend to lean towards the non greasable bearing myself.
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    I'm stumped, overheated 4.3 MPI, water in oil, replaced heads, still water in the oil

    so i got this boat with a 2004 merc MPI, 4.3 engine. the customer overheated due to picking up a plastic bag and starving the impeller of water. i pulled the heads after finding low compresssion and had the checked for cracks and resurfacing. changedthe oil, etc... reassembled the engine and...
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    Replacing U-joints Alpha one gen 1

    yes, not only the seal, you have to break down the bearing/yoke assy. perform a rolling torque on the bearings, replace the lock nut, it is so much easier and accepted practice to just trim 2 of the tabs.
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    Alfa 1 gen 2 sterndrive install issues

    what solved it?
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    Replacing U-joints Alpha one gen 1

    yes, to do it properly, the manual instructs you to remove the input shaft assy and break it down, removing the yoke from the bearings , etc.....
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    shift cable adjustment

    what does this mean? ive read it 5 times and it makes no sense to me.
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    Alfa 1 gen 2 sterndrive install issues

    put the shifter in forward, check the prop and see if it turns counter clockwise. if so, have someone put light pressure on the prop, counterclockwise while you sdjust the shift cable, remove the cable from the linkage and push the cable in all the way. measure from the middle of the adjuster...
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