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  1. 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...
  2. 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...
  3. 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...
  4. 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...
  5. 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
  6. 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 +..
  7. 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
  8. 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...
  9. 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
  10. 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
  11. 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 ...
  12. Scott06

    Mercury 3.0 EST no spark

    if it is not moving around at idle it is locked in base mode. Module only in there. I would try as AD suggests pulling the plug off. Only thing I can think of is if you are getting 12 v to the base mode wire ... Assume balancer hasn't slipped such that you are not actually at TDC ... grabbing...
  13. Scott06

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

    yes the deck is taller on a 351 hence the wider intake bolt spacing Take a picture of the carb, thinking it is an old Carter AFB given the sticker and the fuel inlet location. I would verify it is a marine carb not an auto one... Not sure if the Old carter AFBs (that sticker predates carter...
  14. Scott06

    Runs great on muffs but not in lake

    Take the drive off and see if the shutter ,which should be at the the top of the exhaust pipe just below the down elbow, is blocking flow. If it isnt stuck in there or in drive (it went somewhere) you dont have an issue with exhaust restriction.
  15. Scott06

    Mercury 3.0 EST no spark

    Were the modules from the same supplier? So you are able to get it in base mode and set initial timing, but the timing doesnt advance past 18 deg BTDC? I think you should be 24-26 or so total at 2800 or so rpm. Do you remove the jumper to put it in base mode? seems to be locked in base mode
  16. Scott06

    Alpha one gen II growling noise when turning

    I think he meant the input shaft bearing in drive, but could be bearings on vertical driveshaft. Would think the input yoke and bearing would have some side play if worn and be the only part to make noise when turning drive. I think you only need the tool to remove large ring nut off drive input...
  17. Scott06

    Merc 5.7 Keeps Shearing starter bolts

    Would suspect your bolts are loosening up or not correct, maybe you have a hydro lock going on? Would use a mirror to see if threads are busted, try loctiting them in. My friends boat had a loose starter couple years back, dealer had replaced starter under warranty just after he bought it. Bolts...
  18. Scott06

    Mercruiser 5.7 carbureted wont start when warm

    By the serial number its a mercarb 2 bbl. Was hoping hed post a pic since it had been replaced
  19. Scott06

    Mercruiser 5.7 carbureted wont start when warm

    Scott has you steered straight. Buy or rent a fuel pressure tester plug it into the test fitting scott mentions. Alternatively you can disconnect the fuel line from carb and cobble together flare fittings with hose and a T to put it in line between pump and carb. Need 4-6 psi. you pretty much...
  20. Scott06

    Mercruiser 5.7 carbureted wont start when warm

    How about an engine serial number or picture of carb so we know what you are working on ? Fuel dripping of Venturi when you shut off is stuck needle and seat /float or too high fuel pressure. Can measure fuel pressure then put a carb kit in the carb. What carb did he use ? When this happens...
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