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  1. Scott06

    4.3 Mercruiser Crank, No Start

    I think that is a repower serial number which has a different parts look up. @Fun Times I think knows where to get the parts breakdown
  2. Scott06

    4.3 Mercruiser Crank, No Start

    check with a volt meter if you have 12 v on + post of coil ... Do you have that? Electrical drawings are below.to test you can jumper 12v from battery to positive side of coil if you get spark solve why you dont have 12 v there by chasing it down with a volt meter.
  3. Scott06

    Building a '93 Caravelle 1750 Classic Bowrider

    the 2.5 and 3.0 had ratings ranging from 110-140 hp over the years ( like 60's thru now). Throw in that the ratings went from flywheel to prop hp at some point it is overly complicated. When my folks bought the 91 sea ray it had options of 125 hp (3.0L) and the 3.0LX at 135 hp. If I recall...
  4. Scott06

    4.3 Mercruiser Crank, No Start

    The fuel pump gets power from the starter during cranking, which bypasses the oil pressure switch during cranking, mechanic should have know that. If the Oil switch was bad Fuel pump would run during cranking, engine would run for a short time until fuel bowl is empty, cranking again would...
  5. Scott06

    Mercruiser 3.0L Overheated What to Look Out For?

    200 is not that hot for that time period you are probably fine. If your compression is still good just keep an eye out for milk in the oil that would be evidence of water intrusion. When you do the impeller use OEM merc parts as they last longer. Not sure if this is a Gen one or Gen 2 drive...
  6. Scott06

    Mercruiser 5.7 EFI Water in Oil

    Yes they are 3/8-16 threads. 33 ft pounds is correct
  7. Scott06

    Mercruiser 5.7 EFI Water in Oil

    Yes I know that but when I have done the same it seems like some water sits on top of gaskets. As others have stated make sure surfaces are flat, use the OEM metal/fiber (not paper) gaskets, and a little perfect seal/permatex #3 on the bolt threads so they come out down the road.
  8. Scott06

    Building a '93 Caravelle 1750 Classic Bowrider

    Yeah there is an issue with power given the combo you state. If the tach is accurate prop down until you get rpms up to 4400 or so. I believe Barr makes an adapter for the head and manifold mismatch you have...
  9. Scott06

    mercarb power valve

    Its for enrichment at high throttle openings. Allows more fuel to run parallel to main jets . https://www.carburetor-parts.com/Power-Circuit-Mercarb_ep_2061.html
  10. Scott06

    Mercruiser 5.7 EFI Water in Oil

    Pretty sure that is a casting line to op doesnt look like water is streaking down exhaust side. Think water in bottom came when you took it apart
  11. Scott06

    Building a '93 Caravelle 1750 Classic Bowrider

    Would question if your tach is accurate if only getting 3500 rpm with a 15p, unless you have the wrong gear ratio drive for your engine. what is max rpm for this motor ? You should be up around 4400 or more rpm. I also found the same thing with a couple different 21, 22, 23" props- you hit a...
  12. Scott06

    Mercruiser 5.7 EFI Water in Oil

    this is a leakdown tester. It outs a known pressure of compressed air into a cylinder and measures the residual pressure the cylinder holds. Leakdown is measured as a % leakdown . <5% is great, start getting over 10% you have an issue. What I was mentioning is just putting compressed air in...
  13. Scott06

    Mercruiser 5.7 EFI Water in Oil

    New compression with an accurate gauge is 150 psi. When its starts getting below 115 give or take, or you have a big difference between cylinders you have issues. If low a leak down test can be used to pinpoint where you are loosing it. Can also put compressed air in the cylinder and see if...
  14. Scott06

    Alpha 1 Gen 2 Gimbal Ring

    Leaking is not going to hurt it as it is wet anyways... it will hurt the pin - Nu Wave marine sells Stainless versions. Maybe some others will weigh in but I'd probably run it. Of course if it breaks I'm out of town that week...
  15. Scott06

    Engine oil choice 1984 3.8l

    The only thing I might add is you have a flat tappet cam, some modern oils do not have enough zinc or ZDDP for flat tappet cams as most engines are roller lifters now. Pretty sure Rotella T4 (conventional not sythetic) still does have enough zinc for flat tappets. Not only do a lot of guys...
  16. Scott06

    48 years...

    @Scott Danforth might have some thoughts. Would have the transom plate replaced and made the thickness of the transom mount on the new outboard. have that time into C channel or boxed tubing on sides of motor bath tub to spread the load so be no issue.
  17. Scott06

    Mechanical fuel pump gph question

    a couple of things to verify- Did it ever get above 3500 rpm? What do spark plugs look like? check that throttle blades and choke are fully opening double check firing order compression test verify ignition timing both intial and total advance check fuel pressure
  18. Scott06

    Alpha 1 Gen 2 Gimbal Ring

    If there is no play when torqued to correct (aka manual listed) torque reuse it.. Why are folks saying to replace it?
  19. Scott06

    Alpha 1 Gen 2 Gimbal Ring

    I put put the swivel pin in there and torque the two bolts down put steering arm on swivel pin and see if there is play. From the photo it looks alright to me but can be hard to tell from the keyboard
  20. Scott06

    Alpha One Gen 2 prop shaft seal replacement

    The plot thickens on this one ... Given how much line was stuck in the seals I was concerned that there would be some in the prop shaft roller bearing so I pulled the bearing carrier. The retainer was PITA as I broke my 1/2" drive 18" breaker bar (pissed me off as I had it for years...). A...
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