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  1. Scott06

    3.0 Mercruiser seems to hang or seize when starting

    Start with some basics - compression test- make sure a valve is not hanging up dump a little gas down the carb see if it coughs or runs a bit try rotating the distributor while cranking it to see if timing is off. Would agree with Scott - if its points ignition and has sat for 3 years, even...
  2. Scott06

    Grooves worn in driveshaft

    Thats where the seal rides in the upper, seal and dirt in it will cut a groove over time . Thats doesnt look too bad Would probably dress it up with an emery cloth and put it back in. For deep grooves you can put a speedi sleeve over it. some prop shops will repair these by spray welding the...
  3. Scott06

    Serial number

    Carbs like less than 6 psi (.4 bar to you ) so not much pressure
  4. Scott06

    Alpha 1 Gen 1 - Teardown - Need Advice

    I think the oring on the shaft tended to mess up the shaft seal when reassembling , so they dropped it
  5. Scott06

    OMC 460 backfire under load

    10 v is fine voltage drop is for the points life not the coil.if coil isnt getting mad hot don’t worry about it lowering float level can only lead to leaner fuel mxitures.
  6. Scott06

    Over heat issue

    Take the hose off the thermostat housing where the water comes up from the drive bet you have little to no incoming water flow. Get a impeller and kit with body (assuming you have a Alpha gen one drive) , OEM merc is best.
  7. Scott06

    Alpha 1 Gen 1 - Teardown - Need Advice

    you wont get through the season with those seals. If you do decide to press on check your lube frequently. To pop those lower seal out of the upper is an afternoon of work...
  8. Scott06

    Ford 302...closed cooling

    Thanks for confirming, given your answers we had suspected something in the gene pool for years...
  9. Scott06

    Ford 302...closed cooling

    You are setting your self up for a lot of jokes with this crowd....
  10. Scott06

    Ford 302...closed cooling

    Full system includes the exhaust manifolds in the af side of system. Half system doesn’t cool the exhaust manifolds with af, they get cooled with hit raw water after it goes through heat exchanger. If the hose that is blowing discharges af from thermo housing to manifold and manifold is plugged...
  11. Scott06

    Ford 302...closed cooling

    Tighten the hose clamp... Seriously have you tried a new hose clamp on it? Is this hose on the raw water side or AF side? If on the AF side is there enough room for expansion? If no expansion tank on an older design run the AF level lower. On older cars with expansion tanks if you top the...
  12. Scott06

    RE: Issues with Mercruiser 5.0 LX 4 Barrel Carb

    I would think those modules plus the 10 deg initial timing on a vortec 5.7 would work well. Might have to do some trials with different total advance but they would land you 32 & 34 total respectively. Should be ok
  13. Scott06

    Mercruiser 2.5 120hp ignition help

    different 2.5 in an S10 than this engine. The S10 used the pontiac made Iron Duke 151 cu in engine. The 2.5 Mercrusier is the 153 cu in chevy 4 cylinder that debuted in the Chevy II in 1962... and ceased passenger car production in North America in 1970... the 2.5 /3.0 mercs were industrial GM...
  14. Scott06

    Cracked my out drive need help on a replacement

    Normally a 3.0 and 4.3 would have different ratios drives - 4.3 would be 1.81:1, 3.0 would be a 1.98:1. The ratios should be stamped on the port side of drive by vent plug. Usually in the sticker and stamped in housing as well. With an older drive these may be hard to read, in that case you can...
  15. Scott06

    Mercruiser 2.5 120hp ignition help

    Sounds like the module is not advancing. Is it stuck in base mode ? Delco est is a good system needs to be locked in base mode to set initial timing. instructions are here https://marineengines4less.com/images/companies/1/EST%20Ignition%20Instructions%20-%20ME4L.pdf?1431462059320
  16. Scott06

    2 stroke vs 4 stroke prop differences

    As a rough rule of thumb every 2” of pitch up or down will move wot rpm by about 400 rpm. with the different options in blade size , design, cup etc this is not 100% but a decent rule of thumb
  17. Scott06

    RE: Issues with Mercruiser 5.0 LX 4 Barrel Carb

    Later vortec blocks do not have provision for mechanical fuel pump. So you would need an electric fuel pump and associated oil pressure switch. on a good note this would be a significant upgrade in power 230=>295 hp.. you may find you will need more prop pitch when you get it up and running
  18. Scott06

    Repair Manual for newer MerCruiser 4.5L 250hp

    Would agree thermostat seems to be not closing. the guys mention impeller replacement, which is a good preventative item, cant see this making it run cool. Use oem merc impellers vs the cheaper aftermarket ones. I changed mine after six years was in perfect shape…
  19. Scott06

    Belt Size or Part # for a 1985 Mercruiser 3.0 Alpha One Gen One

    the steel line is just flared 3/8" tubing you could reflare it or use a compression fitting to reassemble it as well
  20. Scott06

    Help Please!

    Bushings wont help vertical play. On my old pontiac with delco points distributor you take vertical play out by shimming the gear with a kit like this. https://www.summitracing.com/parts/mor-26140 if there is no side to side play bushings are fine.
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