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  1. B

    Water circulation issue.

    I'm wondering if I need to remove my exhaust manifold cover.
  2. B

    Water circulation issue.

    Tested on the lake. No water. Tested at home with muffs. No water. At this point, I brought in shop and dropped lower unit to try compressed air. Cannot get air flow through copper tube and I'm wondering what I should remove next....or if I'm even on the right track. Water pumped fine a few...
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    Water circulation issue.

    1977 Mercury 500 Two weeks ago telltale pipe was clogged with mud wasp nest. Stuck a wire up tube and cleared. Water was pumping. Got to house and covered tube with tape. Went yesterday. Removed tape and no water was flowing. Tried the wire through tube but still no water. Here are the...
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    Replacement Propeller for 1977 500

    Thank you. I shall use what I have. Thanks again for answering. Is Stainless Steel worth the expense, or am I just as well off with Aluminum?
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    Replacement Propeller for 1977 500

    I have 10-3/8 14 Pitch would I get a little more sped with a higher pitch?
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    Replacement Propeller for 1977 500

    The motor is in great shape and runs terrific. Excellent compression, though I do not remember numbers, it has been several months since last tune up. I have a 1977 15' Fiberglass Monarch, but I do not have an RPM gauge. I can get about 27 MPH when alone in the boat, but it drops substantially...
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    Replacement Propeller for 1977 500

    I am considering replacing my aluminum replacement prop with a stainless steel. The reason is, I have been told that a stainless steel prop can give you a couple more MPH. Don't know if that's true but hoping for advise from this forum. I have a 1977 50 HP Mercury 500. What is the correct size...
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    No water from cooling hose.

    Nevermind. Took to river yesterday and the pump is putting out a stream.
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    No water from cooling hose.

    Is there an inspection plate on the block I can remove to search for obstruction? And last question....how much of the cooling water is supposed to discharge from the tell tale and how much through exhaust?
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    No water from cooling hose.

    1977 50 HP Ran into 1' mudflat and killed motor. Poled out to deeper water and restarted engine but got no water flow from cowling tube. Dropped lower unit at the house and remover water pump. No clogs or issues to be found in pump assembly or lower unit intake screen. Blew compressed air...
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    Lower Unit Ratio Question

    Thanks boscoe! Then that can't be a bad thing, can it?
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    Lower Unit Ratio Question

    My 1977 50 HP should have a 2/1 ratio as suggested by experts on this forum. I bought a used LU that seems to have around 1.75 to one. My question is.....wouldn't a 1.75 turn the propeller shaft faster than a 2 to 1 Ratio? If I'm getting a full prop rev before I turn the drive shaft twice, then...
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    Lower Unit Issues

    Yep! I had it one spline wrong. Thanks so much for posting this. It will go into the Merc file! The crazy thing is, I have owned the engine for ten years and replaced water pump impeller at least twice before. I must have gotten really lucky with the installs. Either that, or I never removed...
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    Lower Unit Issues

    Looks like I have a wrong lower unit. I'm getting about 1.75 turns for every prop turn. Thanks for the learning lessen. Now to figure out what to do.
  15. B

    Lower Unit Issues

    The driveshaft goes around approx 1.75 for 1 revolution of prop. Sounds like I have the wrong lower unit.:cry:
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    Lower Unit Issues

    Thanks! I will.
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    Lower Unit Issues

    Yikes! Never knew there could be different ratios. I bought it used, obviously, so I didn't know it could be different. I'm re-install and see what happens. Is the ratio printed in some type of model number anywhere on the LU? thanks!
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    Lower Unit Issues

    Thanks so much! Now I'm sure I installed it incorrectly!
  19. B

    50 HP Lower Unit Drive Shaft

    I ended up buying a lower unit that had the correct shaft length. Thanks for your help. My issue now is correctly installing the lower unit. I have started another thread if you have a chance to view. thanks
  20. B

    Lower Unit Issues

    My issue is probably how I have installed my cam reverse lock on the shift shaft. Any help is certainly appreciated.
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