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  1. Scott06

    Shift shaft seal on alpha gen two

    Thanks I have the seals (OEM Merc), Issue is I cannot get them to make a seal in the plastic housing (23-815921A20). They have leaked between the seal OD and the plastic, used permatex #3 and let it set up 8 hrs still bubbled on pressure test. The old seal was very hard to get out new seals...
  2. Scott06

    Alpha 1 Gen 1 oil fill hose

    If you have them I think they are worth keeping for sure
  3. Scott06

    3.0 tap/knock

    Can tell from the keyboard. It’s making noise so you need to go through and measure all the clearances vs spec. If you don’t have the mI do eters would take it to some one who does
  4. Scott06

    Alpha 1 Gen 1 oil fill hose

    Mercruiser offered a kit to add the drive reservoirs to gen one drives. Very rarely seen them in service. The 1991 and up gen two had it from the factory. You can run them without. Only advantage is having it if the input shaft seal goes you loose drive oil into the bellows and you may not see...
  5. Scott06

    I need help, boat runs rough and stalls. I pumped new gas and lots more.. I need help

    It is somewhat common for tach to mess with getting a good spark. If I were in your shoes I would leave tach disconnected put original module back in and test it out
  6. Scott06

    Prop Help

    Even better if it’s on a jack plate , play with dropping it some yiu can look at pics if you google it. Cav plate ( lower of the two plates) should be even with bottom of boat. If you run at higher heights or are on a power cat you can run a prop made for areated water like Revolution 4 , or...
  7. Scott06

    3.0 tap/knock

    I would check the side clearance on the con rods vs spec. In your first post the main bearing cap is off was there scoring on the crank? you said crank was done by whom ?
  8. Scott06

    Prop Help

    What is the motor height - how high is the cavitation plate in relation to the hull bottom ? Thinking motor is set too high.
  9. Scott06

    Merc cruiser electrical

    I did this years ago on a 1966 mercruiser. If I recall correctly I just hooked up the orange battery wire, tapped off the other two and disconnected the voltage regulator
  10. Scott06

    Mercruiser 3.0 Leaking Water On Top of Manifold

    Yeah that looks like under the manifold drain.
  11. Scott06

    Shift shaft seal on alpha gen two

    Gen 1 & 2 are completely different setups gen 2 has a plastic housing for shift shaft seal and speedo tube connection . I bought the seal was leaking between OD and housing. I bought two seals. I used permatex 3 this time instead of red loctite gasket maker. Seems to be holding pressure now ...
  12. Scott06

    Shift shaft seal on alpha gen two

    Just to close this out. The seal was leaking between the metal sleeve and plastic housing. I had put a red permatex gasket maker around it but that’s where it was bubbling … not sure why it didn’t fail the original pressure test, but certainly makes buying the whole p,attic housing with the seal...
  13. Scott06

    I need help, boat runs rough and stalls. I pumped new gas and lots more.. I need help

    Look on summit racing for the module I think their ac delco modules were under $100. if those primary side coil ohms are accurate yes get new coil.
  14. Scott06

    Shift shaft seal on alpha gen two

    I saw the entire cover or bushing too. Did the grease and sealer. Will do it again , get bushing if it doesn’t hold. Hopefully I find a nicked lip when I dissemble it
  15. Scott06

    3.0 tap/knock

    I would be checking the clearances and also wrist pin. doesnt sound like valvetrain to me but could be. Even if it was machined check them always. I have had to take rods back that were resized wrong. was it bored? I had an old volvo that on real cold starts would have some piston slap until...
  16. Scott06

    Shift shaft seal on alpha gen two

    Just got done doing a reseal and a few bearings in my 2004 gen two. Pressure tested it , passed , filled it with lube and laid it on the garage floor for a month, was gonna put it back on the boat this weekend, found lube leaking out of shift shaft seal… which I just replaced. I bought two...
  17. Scott06

    I need help, boat runs rough and stalls. I pumped new gas and lots more.. I need help

    Sometimes people have trouble getting them into base, which is why I suggested just setting the total advance. If total is ok let the base fall where it may. you mention replacing parts because they are 27 years old. No sense replacing oem quality parts with a $13 part of Amazon. There is too...
  18. Scott06

    Prop Recommendation: '85 Merc 50hp 2-stroke - 16' Alumacraft

    Did you check out the ignition system too? this sounds similar to my neighbors issue a few years back, wouldn't get full revs under load, but ran basically ok otherwise. He had a cylinder that wasn't getting spark did have enough azz to get going with a dead cylinder.
  19. Scott06

    Prop Recommendation: '85 Merc 50hp 2-stroke - 16' Alumacraft

    A prop missing part of a blade would allow it to over rev rpm not be 2-3 k lower than recommended WOT RPM. I would go through the fuel system and rebuild carbs first, verify your ignition is up to snuff and good spark on all cylinders, then start playing with props. You can not asses what prop...
  20. Scott06

    Replacing an Alpha1 Gen1 205 V6 for 87 Cobalt 17BR

    Additionally the ratio should be stamped on port side below the vent plug on upper.
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