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  1. Scott06

    Can I install a newer outdrive?

    You should look at a SEI 106 aftermarket replacement for a alpha gen one , you need the 1.94 ratio https://www.sterndrive.cc/product/Fits-Mercruiser-Gen-I-1-94-Ratio-1941017.html
  2. Scott06

    1986 Mercruiser 5.7 Engine Rebuild Crankshaft Questions

    Make sure you get the correct rods. Maybe they didnt redo the rod big ends correctly. or if you cant correctly measure etc might be better spending more and get a new base or complete reman. You could update to vortec head engine and pick up 30 hp https://www.michiganmotorz.com/ i got a new...
  3. Scott06

    Can I install a newer outdrive?

    On port side or what engine do u have …
  4. Scott06

    Can I install a newer outdrive?

    Any mc1, R,MR, or alpha gen one will bolt in and work fine if gear ratio is same
  5. Scott06

    1986 Mercruiser 5.7 Engine Rebuild Crankshaft Questions

    Marine and truck engines use same parts on same assy line. Yes if you cant acess a machine shop buy a rotating assebly from summit or like often good aftermarket parts like this arent much more than maching your old parts. you still have to verify bores etc are ok as it sounds like someone...
  6. Scott06

    Part Identification

    Probably the vent for the fuel tank. My old boat had a separate vent line going to side of hull by conssole. does look in bad shape corrosion wise
  7. Scott06

    1997 mercruiser 4.3 starts right up, runs for about 30 seconds, idles down and dies repeatedly. Oil gauge doesn't peg at all. No oil pressure alarm.

    Jumper around the oil pressure switch that supplies power to fuel pump and test it.fuel pump is fed power off starter during cranking, then off ignition circuit via oil pressure switch when in run. Seems like fuel bowl is getting filled during cranking then runs til bowl is empty. verify oil...
  8. Scott06

    Is My Impeller Bad? Mercruiser 228

    pressure test it with a radiator type tester if u loose a qt in 15 min its going somewhere
  9. Scott06

    Mercruiser thunderbolt IV ignition module

    I think so. This diagram shows the green white from the shift interrupt bonding with a wire going to module
  10. Scott06

    Is My Impeller Bad? Mercruiser 228

    When was last time heat exchanger was cleaned. Most heat exchanger /fresh water kits use a bravo style belt driven pump on older mc1 and alpha gen one set up i believe. You need to move more water through the heat exch than raw water. Did it ever work with this heat exch or did you put it on...
  11. Scott06

    Replace Bravo2 Lower Unit W/ Bravo

    Yes but what prop size are u running bravo 2 allows for huge prop diameters for certain applications Like house and workboats
  12. Scott06

    Squeezing more from 5.0L 220hp

    I have a 5.0 with this manifold https://www.michiganmotorz.com/5-7l-4-bbl-vortec-cast-iron-intake-manifold-1996-current and an edlebrock 1409 has excellent throttle response and midrange. came as part of a partial engine from Mich Motorz i have that in a 21 ft bowrider thats heavy for its...
  13. Scott06

    same speed with different props

    I thought that the reason they give a wot rpm range is the power in that rpm range is basically the same. The dyno curve on the vortec flattens out in that rpm range Some engines have tighter wot range hence the one inch pitch increments in props now. and i completely agree prop to the top of...
  14. Scott06

    same speed with different props

    to go faster you need more power, your engine makes the same power from 4400-4800 rpm. I ran into the same issue played with different props and you are hitting the wall in terms of what that engine and hull combo can do, engine doesn't have enough power to turn the higher pitch prop any...
  15. Scott06

    Clanking/rattling sound after prop change

    Seems correct for your serial number- your initial timing (set in base mode) should be 1 deg BTDC- not in base mode 12 deg , then total timing 23 BTDC at 2800 rpm. if for some reason module is bad could be pulling in more advance... or could need setting
  16. Scott06

    Clanking/rattling sound after prop change

    Check that that the timing not only intial but full advance is correct As mentioned by others the idle mix screw is only for idle through about 1500 rpm then the main venturi takes over. Things that will lean out main mix is any obstruction in fuel delivery- Pump pick up tube clogged...
  17. Scott06

    new GM 5.7 engine holes near oil filter

    Yeah If I recall there is a tapped hole that goes into the flywheel area ...
  18. Scott06

    outdrive swap ? alpha 1st gen what can i use ?

    I would leave the harness with the motor complete bobtail swap both engines should have the same 10 pin plug to connect to helm harness
  19. Scott06

    Merc part number for this bolt?

    Should be part number 12 https://www.marineengine.com/parts/mercruiser-sterndrive-parts/alpha-one-genii-1998-and-up/0l100040-up/driveshaft-housing-and-driveshaft
  20. Scott06

    outdrive swap ? alpha 1st gen what can i use ?

    solution is easy take drive line engine, transom, outdrive from baja and drop it into the Chris craft. Will be bolt in. check stringers and transom for rot when you have driveline out. sell transom housing and drive off Chris craft
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