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  1. K

    1989 Merc 3.7 3.0. Need help remember part number

    THANK YOU !!!!!! This is so Helpfull!!!
  2. K

    1989 Merc 3.7 3.0. Need help remember part number

    So I found this 6916779 and Up for my serial number
  3. K

    1989 Merc 3.7 3.0. Need help remember part number

    I need to purchase an impeller again 2 years mark I need to remember who to look up mine Alpha 1 Gen one from what I remember but I need to find the part number for that
  4. K

    1989 Merccruiser 3.7 CLY Head leak ?

    Are you suggesting that I pop the expansion plug out that’s already in there and then put in this thermal plug as a way of plugging up the whole rather than waste my time putting another expansion plug-in. My plan was to remove the existing expansion plug and try to get another one in there if...
  5. K

    1989 Merccruiser 3.7 CLY Head leak ?

    OK, so I’m really confused because looking at the picture and some videos I’m seeing an expansion plug and then listening to other people here I’m getting stories about screwing it in. Now I don’t see any threads on mine so I’m really confused because according to my research, I have an...
  6. K

    1989 Merccruiser 3.7 CLY Head leak ?

    Now I have to find the correct part. My research leads me here https://shop.advanceautoparts.com/p/dorman-steel-cup-expansion-plug-43-64-in.-height-0.270-sold-by-each-555-120/22140416-P
  7. K

    1989 Merccruiser 3.7 CLY Head leak ?

    Are they 460 heads actually and the 43/64 expansion will fix 555-120 part .666 expansion cap ?
  8. K

    1989 Merccruiser 3.7 CLY Head leak ?

    So I started the boat today shot a little starter fluid and she started up and then I heard a noise and exhaust noise and I said what the hell is that. Well upon looking a little bit closer, I noticed a leak that looks to be like a freeze plug, I may be wrong. Now I’m just looking for some...
  9. K

    Doing a Full Removal 1986 Mercruiser 3.0L 140 hp Engine Question

    I did my gantry by measuring the ground to the top of the transom then I added 4 feet for the engine. Remember for the chain pulley you loose about 1 foot . I bought a 1 heavy duty foot chain for the chain pulley to hang on. There are many gantry designs you don't have to go nuts . Yesterday...
  10. K

    SEI Alpha 1 Gen 2 lower ratching noise (with video)

    That is why they say never run the boat with the outdrive up. I have the same set up. It used to worry me too . That was 3 years ago.
  11. K

    Hard to pull

    I had this happened in my mower ... Check the oil and see if it smells like gas. Also drain the oil if it needs an oil change and see if it easier Without fluids.
  12. K

    Prop size 1989, Mark cruiser, 3.7,18.9

    4200-4600 is what I found out from my boat
  13. K

    Prop size 1989, Mark cruiser, 3.7,18.9

    I am trying to figure out when I bought this boat a while ago if I actually bought it with the correct prop size I have a 1989 regal medallion wonderful boat. It was in storage for like 20 years. It’s running fantastic but I’m just curious what is the proper propeller size for this boat right...
  14. K

    Engine compression question

    New fuel Pump 2 years ago / New inline filter/ No water separator/ No water ever seen in the carbs. The tube and the screen in the tank are new. The anti siphon valve has been replaced with an open one. I am in the process of setting up a 2 gallon tank and eliminating the gas tank. I will...
  15. K

    help help help overheating Mecrusier

    Sorry I disagree. LEARN how to fix the basic thing. I see coworker pay 600.00 for a 30 brake job I have seen a person pay 1500 to install a 1 hours alternator in a car !!! My point is these shops can realy SCREW you over. So it is best to come here and LEARN not run and pay someone. I rebuilt my...
  16. K

    Electronic fuel pump.

    That’s exactly what I did. I had a battery switch. Thank you very much.
  17. K

    help help help overheating Mecrusier

    When I did my first two impellers on my own, I made sure I was watching a YouTube video and I looked at the direction the fins were pointing. I think it’s a clockwise scenario that the fins have to point in a clockwise angle.
  18. K

    help help help overheating Mecrusier

  19. K

    help help help overheating Mecrusier

    I like the backflush idea I know you got that’s on the old dry that stop debris in all things getting in there and clogging stuff up but you never know
  20. K

    help help help overheating Mecrusier

    That’s a great tip, but wait what about the guy that doesn’t have $2000 to drop on maintenance what does that guy do?
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