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  1. S

    120 Mercruiser I/O Trim hydraulics

    Thank you. I somehow actually missed that whole post. Guess that's what I get for using a phone instead of a computer. Hard to see on a phone. Getting old and blind, lol
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    120 Mercruiser I/O Trim hydraulics

    I think it's the four o rings that are bad, but I've had this down for so long now and have tried so many different sizes I'm not sure what the original size is anymore. I've been trying to go off of the indentions but it hasn't worked so far. I wish I knew what size was called for, like maybe...
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    120 Mercruiser I/O Trim hydraulics

    I have a 1973 120 mercruiser pre alpha I/o and it is squirting oil from the trim control valve assembly and I can't seem to find the correct size o-rings. Anyone know if there is a o-rings kit available based on my trim unit or engine type or some way to reference where to get the o-rings I need...
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    1973 mercruiser pre alpha trim control valve

    I have a 1973 120 mercruiser pre alpha I/o and it is squirting oil from the trim control valve assembly and I can't seem to find the correct size o-rings. The serial # of the motor is 3645749 and it is a 18 ft bottom SS StarCraft if that helps any at all.
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    1973 mercruiser throttle info

    Not having any luck. The one from Don s is evidently from 2012 and no longer works. The other alternative listed text me to the phone cleaner site mentioned in that thread, and the boat infosight which used to be good I can no longer open because it demands flash player which is no longer...
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    1973 mercruiser throttle info

    Does anyone know where I can find a download of Mercruiser Stern drive I/O 1963-1973 Service manual? I actually only need section 2 (throttle and shift cable adjustment). I already own the rest of the manual but somehow ended up not having section 2. The embarrassing thing is that I've had this...
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    Overheat issue

    It had a 140 degree thermostat. I ordered a new one and installed it and it seems to have cured the problem although my temp gauge is not working for some reason, but then again, the boat set up for 5 years. Now I'm trying to figure out the throttle issue. Huge dead spot and boat dies on and off...
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    Overheat issue

    Anyone have any input?
  9. S

    1973 Mercury 40 4hp: Compression, Spark, Fuel - No Start

    Like I said, I really don't know anything about boats, sincerely, I was just trying to come up with ideas to help.
  10. S

    Overheat issue

    Over the winter before I put the boat in the water I was running the engine for a minute or so at a time with no water while troubleshooting different things due to the fact the boat had been setting. My assumption at the time was since I was going to put a new impeller in the lower unit anyway...
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    Overheat issue

    Standing inside the boat, in the front, turned around looking towards the engine, I had hot water present on the left side of the engine in the large u candy cane shaped hose going into the water distribution Block, no water present in the large hose hooked to the right side of the block. Stuck...
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    1973 Mercury 40 4hp: Compression, Spark, Fuel - No Start

    I only have automobile knowledge. With boats I'm illiterate. But if it was a car engine I would say check timing, fuel pressure if fuel pump was newer electric, and timing belt, or even something weird like broken camshaft. But, like I said, I don't know anything about boats.
  13. S

    Overheat issue

    The impeller is in the lower unit of the stern drive which was new before this incident, now I'm not sure.
  14. S

    Overheat issue

    The temperature gauge never moved and it used to work.
  15. S

    Overheat issue

    I do not have that tank on the front of my engine. Didn't realize I could ruin the water pump on the engine side if I understand correctly.
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    Overheat issue

    Honestly I really don't know the difference, but I'm assuming raw since it sucks up lake water and pumps through the system and comes out through the back of the prop. Don't really know anything about the other.
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    Overheat issue

    Wondering what likely damage I have caused as well, hopefully the motor is still okay, it does still run.
  18. S

    Overheat issue

    I have a 1973 starcraft 18 ft v bottom boat with 120 horsepower inboard outboard MerCruiser with a pre-alpha one sterndrive. (3645749 serial on sterndrive plate) I took it out yesterday for the first time in several years after putting a new impeller and housing in it and new stern drive oil and...
  19. S

    Prop won't spin

    1974 mercruiser 120 hp I/O. Changed impeller, now prop won't spin. Any ideas? Thanks
  20. S

    Winterizing 120 hp mercruiser 1973 I/O

    I know this is an old boring topic for you oldtimers and that I'm probably in the wrong section (again) so I apologize in advance. It's a big site. Can anyone give me specific info on how to winterize my 1973 120 hp mercruiser starcraft I/O Supersport. Drains/plugs, how many and where? Fogging...
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