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  1. Scott06

    Engine choice

    I think a lot of the water pump complaints on alphas is due to the use of junk aftermarket parts. I maintained a 1990 3.0/gen 1 in a 17 ft sea ray for 20 years. My folks bought it well cared for when it was 5 years old and i sold it when it was 25 years old After beating the **** out of it...
  2. Scott06

    Where can this water be coming from?

    X2 on core or freeze plug in back of block. Engine has to, if not come out,be lifted and pulled forward so flywheel can be removed to acess plugs. make sure you use a brass or stainless plug, do not use steel as they will corrode in marine applications. if a core plug is pressed out likely...
  3. Scott06

    Engine choice

    if yiu were going to keep the boat on a 24 ft I would get a bravo.if you are trying to piece it together to sell yes an alpha gen one or two. They stopped making the gen one in 1990 so that is likely why you find them cheaper. The gen 2 has a better water pump And is a more robust drive. not...
  4. Scott06

    Fuel injected parts no longer available

    Injectors can be cleaned or replaced normally things like the ecm are NLA . In that case yes the options are swap to carb or get used parts. Normally little in the automotive world can be used on boats do to electrical spark and fuel safety requirements. specifically what engine is in it ...
  5. Scott06

    Co-owning a boat?

    I had a friend who did that with two coworkers. They bought a year old rental pontoon from a marina, so it was new and had warranty. None of them were mechanically inclined so they split all marina, winterization, maintenance, gas fees three ways. One of them set up a calendar like you mention...
  6. Scott06

    Oil Analysis for high-hour 4.5L 250 HP

    No they are Merc produced engines not GM based. the 4.5 bears no resemblance other than number of cylinders to the 4.3.. It is confusing on the 6.2, Merc did use a GM bases 6.2 up until like 2015 ( stroked 5.7) the new Merc 6.2 other than displacement has no commonality with GM made engines. I...
  7. Scott06

    Need Prop guy for Inboard - LI NY

    If you get stuck I have used Prop MD in MN via mail order. Was the same cost w shipping that the local ish guy was and saved me 2 hrs of driving ... I hate doing things that way (not supporting local businesses) but was convenient and they did a nice job
  8. Scott06

    3.0L Raw Water Intake & Drain Port Questions

    Oh I thought they were part of the kit , then by all means remove them
  9. Scott06

    Oil Analysis for high-hour 4.5L 250 HP

    exactly the conclusion I came to. I normally am a OEM user but M1 seems to be a better oil.
  10. Scott06

    3.0L Raw Water Intake & Drain Port Questions

    Would think the T will let air in the raw water hose so it drains back both ways ? Otherwise water would lay in there and freeze. Can only assume it is essentially a vacuum break. There is a name on the heat exchanger would think there tech dept can answer the question
  11. Scott06

    Oil Analysis for high-hour 4.5L 250 HP

    I never had an analysis but found with merc 25W-40 when used at higher rpms for extended time my oil pressure would drop from around 60 to low to mid 40 s . Not sure if it was shear or foaming or what. Also had similar with rotella 15/40. found Mobil one 15w50 did not do that
  12. Scott06

    Mercruiser Alpha One, Gen 2 prop shaft rear seal r&r

    There are two seals in there - the line cutter is a seal with a metal shield intended to keep finishing line out of seal. Speaking from experience it doesn’t work …number 57 &58 here...
  13. Scott06

    Another prop slipping thread

    Yes completely agree was thinking about this wondering if the prop to hub clearance or slip is greater. I would not not replace the coupler since you are there and the alpha drive either grabs or it doesn’t. You may need a prop with more bite if you go out with a boat load of people… try a...
  14. Scott06

    Not getting fuel

    You will only see it coming from accelerator pump nozzle when throttle is pumped. Fuel pump fills fuel bowl that is a reservoir of fuel to be sucked into the air going into engine while running Thru the jets and the Venturis. There is an accelerator pump that is a small pump inside carb that...
  15. Scott06

    Not getting fuel

    Entirely possible needs a carb rebuild. When this happens do you have spark? If u dump a little gas down carb and you have spark it should at least cough if not run for a bit. Need to do some looking if you are missing gas or spark when it happens. Spark gap tester is cheap and effective on...
  16. Scott06

    Temperature Sender?

    Yeah you can use a standard 1/4” npt. Just be aware that the blue plugs do not have a NPT thread on them. I think they are 1/2” coarse so it is not a regular pluming fitting. If I recall I thought there was a thread on here on the knock sensor being a standard GM part. The knock module is a GM...
  17. Scott06

    Mercruiser 5.0 starting problem

    Would rule out some basic stuff like dead battery, loose or corroded battery cables (don’t forget ground cable too). Cycle shift to see if neutral safety is not making. attached is wiring digram yellow red going to slave relay gets power when key is in start. Check for 12 v there. If none it is...
  18. Scott06

    Another prop slipping thread

    I usually go oem. While they are expensive there is too much junk out there last Sierra item i used , trim sender, never worked right . Limit switch works, could never get the sender working right seems to be reasonably accurate at idle speed but goes all the way up when on plane. Too much...
  19. Scott06

    Blown head gasket

    First thing I would think it got overheated at some point. Would check the head and block surfaces for flatness. While the heads are off may have them gone through at a machine shop. Was compression good on the other cylinders? would change out the impeller in drive as a precaution.
  20. Scott06

    Another prop slipping thread

    Rhoads lifters bleed off cam duration at low rpms To tame wild cams And create more low end power and idle vacuum. They reduce the effective cam duration by 10-15 degrees below 3500 rpm. Commonly used in hot rods in the US. Probably the first attempt at variable valve timing, but rather than...
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