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  1. 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...
  2. 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 .
  3. Scott06

    Mercruiser 260 Backfire Through Exhaust

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

    Mercruiser 260 Backfire Through Exhaust

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

    Mercruiser 260 Backfire Through Exhaust

    https://www.summitracing.com/search/part-type/machinist-straight-edges
  6. 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.
  7. 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
  8. 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
  9. 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
  10. Scott06

    Mercruiser 5.7 carbureted wont start when warm

    unless the original core was bad either rebuild it with a good kit or send it to a place like Mikes Carb Parts For rebuild. I would question a mechanic who couldn’t or wouldn’t rebuild a OEM carb,unless the carb core/body was screwed up, only to put a cheaper aftermarket carb on. the mechanic...
  11. Scott06

    Identifying 1976 Engine-is it a 302 or a 351?

    intake is fine if it is dual plane, which it looked like in photo in post #7 you can see the runners are on two different planes, so it is actually an upgrade as long as you are in fresh water. Salt or brackish will rot a non marine aluminum intake. just get a marine carb and you are good to go...
  12. Scott06

    Mercury 3.0 EST no spark

    I would try sending both your modules back for replacement as that is the only thing it could be. Unfortunately you aren’t the first person weve seen on here who had to try multiple modules to get one working one. might be worth a call to a place like Michigan Motorz. When i bought my...
  13. Scott06

    Prop Contacts Trim Tab Only When In Gear Not Neutral

    Pretty sure the Q1 part is the quicksilver version of the mercury K1 version. Merc and quicksilver use basically the same part number except for a digit or character. Same part sold through merc dealers or labeled as quciksilver anywhere …. Both require the correct thrust washer i suspect that...
  14. Scott06

    Mercruiser 260 Backfire Through Exhaust

    Did you check the block and head surfaces for flatness could have warped either and be the source of leaking. Normally need to use a machinist straightedge and feeler gauge
  15. Scott06

    Mercury 3.0 EST no spark

    http://marineengines4less.com/images/companies/1/EST%20Ignition%20Instructions%20-%20ME4L.pdf?1431462059320 the wiring diagram in the install instructions show only one wire to shift interrupt timing shunt has the two white and a black to 12 v +..
  16. Scott06

    Alpha one gen II growling noise when turning

    that I do not know maybe @achris does . He may also have some ideas on your noise as I would expect a gimbal and u joint replacement to take care of it
  17. Scott06

    Identifying 1976 Engine-is it a 302 or a 351?

    I think yours is a a dual plane - likely an Edlebrock Performer. That is not a marine carb. as outlined about would swap it for a Edlebrock 1409. Yes all stock marine cams are fairly sedate in terms of duration and overlap, but usually there was a 15-30 hp diff between 2 bbl and 4 bbl...
  18. Scott06

    Runs great on muffs but not in lake

    then it is no issue you have an issue making power which you wont notice on the hard because there is no load on the engine
  19. Scott06

    Alpha one gen II growling noise when turning

    Check out this video gives an idea of what comes out this Chris is a moderator here and has excellent videos all worth watching Would think you can pop it out and feel for roughness. I assume yours has a drive lube monitor so it wouldn't run dry if input shaft seal leaks
  20. Scott06

    Identifying 1976 Engine-is it a 302 or a 351?

    That's what I was thinking too. Somebody was short a vacuum cup assortment ...
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