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  1. Scott06

    Mercruiser 305 V8 running hot at low RPM fine at Speed

    If you have the check balls on the thermostat housing they can pass raw water from the impeller right out the exhaust starving the engine. Somewhere in the merc manuals there is a flow test for quantity of water coming up to the thermostat housing. Easy test to do to verify water is getting...
  2. Scott06

    Lost gearage?

    In theory you can do it your self if you have the merc specific tools ($$), a factory manual, and some decent know how. I think usually if you are paying someone to redo it You end up at the $2k SEI aftermarket cost or the new Merc ($3400) cost pretty quick the gear set kit alone is $600...
  3. Scott06

    Damp exhaust manifold

    i think normally best to test the manifold by filling with acetone that will wick into cracks easier. Other than that yes two gaskets would only be used if there was a block off plate in between for closed cooling. Would take all gasket material off and file it flat or use belt sander. If they...
  4. Scott06

    Lost gearage?

    same ratio as you have ... 1.65
  5. Scott06

    Penn Yan Commander 339 (33') with a tunnel hull

    Any boat that this 20 + years old of that vintage can have stringer or transom rot. a good marine surveyor should be able to diagnose these issues and use a moisture meter to tell the condition of the structure. If you are not versed in this I would recommend a survey , could be the best money...
  6. Scott06

    Penn Yan Commander 339 (33') with a tunnel hull

    Have you water tested it yet? My grandfather had a 66 Penn Yan Imperial 19, was a nice fishing boat. At that time they made tunnel hull and I/O versions of the same boats. I do think in shallow water areas the tunnel hull can be more popular or somewhat desired. I suspect the inefficacy is more...
  7. Scott06

    Need help with plugs selection

    It looks like in your other thread you have an 8 bolt intake with 8 vertical intake to head bolts. If that is the case use MR43 LTS. As bondo mentions Vortec is the head type not the block. Given the interchange of parts over the last 68 years on the SBC you can have a lot of mix and match of...
  8. Scott06

    Lost gearage?

    Thats a gen two would stillgo by bondos comment of getting a SEI drive. i would be worried about why someone sealed the transom housing to transom with rtv and 5200. Usually if that is leaking it is due to a rotten transom.
  9. Scott06

    Lost gearage?

    This is the best answer. On an alpha gen one or earlier drive without the lube monitor bottle, best to check the lube level frequently. If the input shaft seal goes the lube leaks into the bellows and you will never see it before the upper gear set runs dry. If its in a lift or trailer kept...
  10. Scott06

    Can you guess how much I paid for all this?

    if stingers and transom are ok that probably fine, if not it is $ 850 too much
  11. Scott06

    Can you guess how much I paid for all this?

    How much? probably too much….
  12. Scott06

    Motor won’t turn over

    And hasn’t set idle mix or idle speed screws either …
  13. Scott06

    3.0 Mercruiser seems to hang or seize when starting

    As bt mentions veryify battery and electrical connections. Take spark plugs out of engine should spin by hand. If it hangs up might pull the drive as drive ujoints or gimbal bearing could be frozen if it sat with water…. Engine could be corroded too and hang up
  14. Scott06

    Water Leaking from sides of stern drive help

    Yes those are the idle relief ports exhaust and the spent cooling water it contains will come out when running on the muffs. It wont be even side to side in terms of how much water. I think on my 3.0 it mostly came out one side
  15. Scott06

    97 Mercruiser 3.0LX will run/won't run

    There's no gunk on yours you can measure it with multi meter set to ohms for your knowledge base. Usually this is related to shifting in or out of gear, worn shift cable will drag the switch and trip it cutting ignition vs causing a quick ignition cutoff/ stumble required to get the dog clutch...
  16. Scott06

    97 Mercruiser 3.0LX will run/won't run

    You can measure ohms across the switch to see if it closes when actuated How did u zero in on shift interrupt ? If you installed a controller is it tripping the interrupt switch? On water would disconnect it if engine dies and see if it starts as this will kill ignition
  17. Scott06

    What is this hose coming off of fuel pump

    Yeah wrong hose Napa sells the tygon From fuel line set up Looks like some one swapped out a pump with the bowl on the bottom to the one with the bowl on the top. They used both styles over the years on 3.0 s In addition to the tygon up to carb would get a 90 elbow where the tygon attaches...
  18. Scott06

    Maybe my turn for new boat time

    That is frustrating. My Sea Ray came with a wiring diagram and parts book. When I needed a fuel tank sender it had the OEM manufacturer and part number on it.
  19. Scott06

    Show me a better or more unique sounding short block v8 than this wee monster !

    Yes. Any engine can run on the ground .
  20. Scott06

    Replacing 95 merc 4.3 with 87 OMC 4.3

    Absolutely that is a common cause of hydrolock. The surfaces between the exhaust and water passages have to be flat so gasket can seal. Big issue especially in salt water. Post a pic of them and the elbow folks here can probably steer you wether dressing them with a file, belt sander, or having...
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