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  1. Scott06

    1979 3.0 140 mercruiser engine swap to 1988 3.0 engine

    you can go to the resto forum and see how folks check with drilling small holes. Unfortunately likely will need replacement, its pretty insidious how rot will migrate through a boat
  2. Scott06

    1979 3.0 140 mercruiser engine swap to 1988 3.0 engine

    Yes a mc1 will bolt up to a later R, MR, or alpha one gen one drive. as Scott mentioned if you do the swap might be worth going to the c1991 and up gen 2 set up. have you checked your transom normally all that sealant slapped around the transom housing is indicative of transom rot
  3. Scott06

    1979 3.0 140 mercruiser engine swap to 1988 3.0 engine

    Yes one piece rms went to flywheel mounted coupler vs one on studs coming off crank hub. Not sure if it was the mc1 to R/MR/alpha gen one that must have made coupler shorter . He should have both couplers so should be able to mix and match a solution
  4. Scott06

    1979 3.0 140 mercruiser engine swap to 1988 3.0 engine

    Could be maybe can swap coupler off old engine to match yoke not. I don’t think the 3.0 changed coupler or flywheel until 1990 ish when single piece real main seal was implemented
  5. Scott06

    1979 3.0 140 mercruiser engine swap to 1988 3.0 engine

    As outlined you should have everything to mix and match components to make it work. Use the MC-1 flywheel cover to match your MC-1 mounts. Riser offset you may have to mix and match or use marine hard wall exhaust hose. Shifter assembly - as Bondo mentions it can go where ever is easiest...
  6. Scott06

    Concerns with exhaust

    The bellows are a PITA to change so a lot of guys use the exhaust tube that only connects on the transom end. with the bellows expansion tool I did not find it terrible to but the exhaust bellows on. Would I want to do that job every week.. no but not a deal breaker
  7. Scott06

    Concerns with exhaust

    Drain it but shortly two more people will come by and give you three different answers. are you in fresh or salt? For best results therotically drain and back fill without anitfreeze with corrosion inhibitor ( aka not the $3/ gal chit at Walmart)
  8. Scott06

    Engine Overspeed?

    Yeah MB and BMW do some stupid chit these days. Wife loves her Mini ( aka BMW) but my god what a maintenance hog vs our Toyotas. Have one window on the mini that gets fooled into thinking it’s closed by the controller, also the rear view mirror doesn’t stay up. Easy change out right…. No the...
  9. Scott06

    2 Mercruiser 5L EFI with all 16 Cylinders of 175 psi or more??

    X3 what AD and Bondo said these are great numbers but a bit inaccurate. All it shows is engines in great shape. What was one engine replaced? Or is this an older boat where repowers we’re done staggered ? if in salt would be thinking water ingress due to exhaust manifold lack of maint .
  10. Scott06

    Concerns with exhaust

    Exhaust bellows can be torn and nothing will happen. They are full of water when boat is at rest because exhaust gets routed to the prop hub. if your driveshaft bellows and shift bellows are good leave it alone. I ran several season with a torn exhaust bellows before I did a complete transom...
  11. Scott06

    My stern drive oil is black

    The only time i have seen black drive lube (this is bluesih green merc hi perf) was when I bought a handyman's special. Boat was 10-11 yrs old with only 37 hrs and a cracked block due to no winterization.... Pretty sure lube had never been changed, boat still had the original fuel and oil...
  12. Scott06

    3.0 Mercruiser

    Well if you made this much improvement by cleaning the tank and lines would think taking the carb apart for cleaning would be worth knocking off the list. The anitsiphon valve might be worth pullling to see if it hangs up intermittently, are the inside of the hoses degraded ?
  13. Scott06

    3.0 Mercruiser

    Reving in neutral is meaningless it take no power to rev up with no load on it. when it dies have you checked spark strength with a cheap spark gap tester? If spark is good when it dies you are still dealing with a fuel supply issue .
  14. Scott06

    3.0 Mercruiser

    If you are not getting fuel likely the pick up (some have a screen inside of pickup tube) , or anti-siphon valve are not working or there is a blockage in the line. I think some guys have t'ed in a vacuum gauge on suction side to verify. As mentioned put a remote tank on temporarily to isolate...
  15. Scott06

    3.0 Mercruiser

    No that is the sending unit for tank level. when it stalls you still have spark ? when it stalls and you pump the throttle do you see gas squirted in by accelerator pump? if when it stalls dribble some gas down carb. Does it run a bit then?try to determine if you are missing gas or spark when...
  16. Scott06

    Mercruiser 5.0mpi w/yamaha outdrive

    Yes I think the transom hole is the same or similar. Your best bet is to find a used tear out with transom assembly and drive, otherwise piecing it together will kill you. what boat is it in ? If you can use an alpha gen two that cheaper than a bravo. you may be able to find a junk boat cracked...
  17. Scott06

    Bellows replacement

    Quicksilver is Mercury's brand that they sell outside of their dealer network. It is the same as Mercury products and is not the same as Sierra which is an aftermarket supplier
  18. Scott06

    Inaccurate Compression readings due to low battery?

    When the engine is warm and up to operating temp the pistons rings valves expand with temp. normally a compression test is done after an engine is up to temp. it is more representative of the engine condition
  19. Scott06

    Oem vs aftermarket cool fuel pumps

    If you can find an aftermarket Airtex (part of Carter) I believe they are who supplies the oem pumps.
  20. Scott06

    Lifespan of 4.3 V6?

    Are you in salt or fresh water. As Lou points out 5-7 years replacement in salt. In fresh they last the lifetime of the boat generally. water in oil is from overheat due to people too lazy to replace the impeller then using it hot, or freeze damage. With routine maintenance the rest of the boat...
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