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  1. Scott06

    Proper prop??

    jimbo is steering you straight need to drop pitch 17” three balde should get you to about 4600 rpm if 4 blade would go 16 or 15” are u currently using aluminum ?if you want to pull skiiers try a michigan vortex 4 blade 16” i used one on my previous boat did wonders for holeshot
  2. Scott06

    Overheating issue.

    Good looks like a bunk sending unit
  3. Scott06

    Overheating issue.

    Also you replaced the thermostat and gasket. The oem merc thermostat housing gaskets have rivets in them to ensure continuity between the thermostat housing and engine. You may not have that if aftermarket gasket is used. More resistance to the gauge will indicate higher temps. if no rivet...
  4. Scott06

    4.3 mercruiser engine replacement

    Best to start your own thread or ask the mods to move it to a new thread... Yes you can go back in with a vortec motor. Exhaust manifolds are the same but need to check if yours are not cracked given other issues. Will need a Vortec intake as well. Can get a '96 and up truck engine swap marine...
  5. Scott06

    Mercruiser 260 Backfire Through Exhaust

    @Scott Danforth would know
  6. Scott06

    1989 mercruiser 7.4 bravo one

    entirely possible if engine was replaced with a partial engine over the years it is not in the factory Merc location. If you look at the photos of the rear of the engine in this partial engine package there is a bracket between distributor and carb where they are located in a lot of non OEM...
  7. Scott06

    Mercruiser 5.7 carbureted wont start when warm

    His carb is dumping a huge amount of fuel down out of the float bowl after shutoff.
  8. Scott06

    Mercruiser 260 Backfire Through Exhaust

    Good at least you know exactly what wrong . Hopefully you find a crack in the head not block…
  9. Scott06

    Struggling with Gauge Temp

    Exhaust elbow on top of exhaust manifold
  10. Scott06

    Struggling with Gauge Temp

    If that water tube seal is split you wer likely leaking water on discharge side of impeller pump, only would contribute to overheating by dumping cooling water into the exhaust stream and overboard instead of to engine
  11. Scott06

    Mercruiser 260 Backfire Through Exhaust

    I don’t think he tested the other manifold yet or at least only mentioned port manifold. Either way if the block and heads hold pressure no need to take them apart
  12. Scott06

    Mercruiser 5.7 carbureted wont start when warm

    What you originally described hot restart issue but would restart if u opened throttle is a flooded engine from fuel spilling in after shutoff. So likely if you fixed needle and seat and fuel pump pressure is ok it will work. Plugs may be fouled and in need of cleaning. in the attachments in...
  13. Scott06

    Can the base of engine work? Two to bolts under engine are rusted and can

    Just make sure it is the same thickness as original gasket material or close to it. you have to remove the distributor to install the gasket so you it will affect the timing. Plan on retiming it .
  14. Scott06

    Mercruiser 260 Backfire Through Exhaust

    Entirely possible the water coming in the combustion chamber is from the exhaust.
  15. Scott06

    Mercruiser 260 Backfire Through Exhaust

    If the heads are still on leave them and pressure test the block and heads together.
  16. Scott06

    Mercruiser 260 Backfire Through Exhaust

    https://www.summitracing.com/search/part-type/machinist-straight-edges
  17. Scott06

    Mercury 3.0 EST no spark

    Agreed on Sierra- to OP I would call MM and speak to one of their tech support folks to make sure we aren't missing anything before purchasing another module.
  18. Scott06

    Boat turns over but will not start

    Check for spark. If you put starting fluid in it and it didn’t cough suspect u have no spark. also if you had a head gasket done was it running afterwards? might be the valves arent adjusted right and there is no compression. What cuased head gasket failure
  19. Scott06

    Mercruiser 5.7 carbureted wont start when warm

    What was it doing that caused you to rebuild it. normally the biggest issue is getting all the passages clean heres a couple of screen shits of manual pages showing setup for mercarb would assume sierra uses the same carb set ups. Check float isnt water logged
  20. Scott06

    Prop Contacts Trim Tab Only When In Gear Not Neutral

    Normally gen 2 have a flat annode, maybe some of the non PS 3.0 s had them. Either way trim the tab and get on with your boating
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