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  1. A

    Orientation of the oil retention seals on the prop shaft

    Thanks for the information. Hopefully I'll get it right. It was over 70 degrees today (3/19) in Iowa. We will be getting the boat in the water fairly soon.
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    Orientation of the oil retention seals on the prop shaft

    I agree. I didn't think of the shift rod sealing last spring when I had it apart. I'll check those areas better.
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    Orientation of the oil retention seals on the prop shaft

    Thanks. I will check the shift rod O-ring. The plastic seals on the screws seem to be in good condition but they are likely original (1979) and probably should be replaced.
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    Orientation of the oil retention seals on the prop shaft

    I have a 1979 Evinrude engine, model 55975c. I get water in the gear case oil. The oil gets milky after two or three uses. I changed the oil seals last Spring but continue to get water in the gear case oil. I also replaced the large "O" ring that goes on the bearing housing. Perhaps I put...
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    1979 55 hp Evinrude shut down suddenly

    My 1979 55 hp engine 55975c has been running well this spring and summer. It is a boat that had not been run for 15-20 years before I acquired it. It had an emulsion tube gasket missing in both carburetors. That problem was discovered and solved through this forum. Since then, it has run...
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    1979 Evinrude 55 hp will not run full speed without choke.

    Thanks, everyone. The emulsion tube carb gaskets arrived. Installed them in the carbs and reinstalled the carbs on the engine. Tested the boat on the river today and it ran great. It ran full speed. Thanks for everyone's input.
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    1979 Evinrude 55 hp will not run full speed without choke.

    Right. Since this is a long-standing problem from before I received this boat, I'd say the gaskets were not present when I took the boat to the shop to have the carbs cleaned and renewed. Since the old gaskets were likely not there, he simply restored things like he found them. He definitely...
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    1979 Evinrude 55 hp will not run full speed without choke.

    Neither of my carbs have that gasket. I ordered two today. This will probably clear up the whole problem. Thanks
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    1979 Evinrude 55 hp will not run full speed without choke.

    My carburetors do not have that gasket installed. I will order two of them. This is probably the whole problem. Thanks.
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    1979 Evinrude 55 hp will not run full speed without choke.

    I removed the carburetors on my 1979 55 hp Evinrude 55975c outboard. I inspected the jets. All were perfectly clean and looked good to my untrained eye. The idle jet is a 45 in the top carb, and an unreadable number (looked like VV) in the lower carb. The off-idle jet is a 37 in the top...
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    1979 Evinrude 55 hp will not run full speed without choke.

    Yes, it has an idle jet, an off-idle jet and a high-speed jet. I've assumed they work together and keep "adding in". It sounds like the high-speed jet works alone above the approximate 1500-1800 rpm range.
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    1979 Evinrude 55 hp will not run full speed without choke.

    I have not taken the carbs off this week as I had planned. I hope to on Monday. I will try to look closely at the items mentioned above. I wonder at what point the carbs go from depending on the off-idle jet to the high-speed jet. My acceleration issue actually becomes apparent somewhat...
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    1979 Evinrude 55 hp will not run full speed without choke.

    I haven't tried that. Will plan to do so.
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    1979 Evinrude 55 hp will not run full speed without choke.

    I don't know what you mean by a manual fuel pump. Are you referring to the fuel line bulb?
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    1979 Evinrude 55 hp will not run full speed without choke.

    I'll pull and inspect the carburetors. Do you think the weak fuel pump idea has any merit?
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    1979 Evinrude 55 hp will not run full speed without choke.

    Today on the river the engine started and ran well with the exception it bogs down around half throttle. When I push the key to engage the choke it accelerates to nicely to full throttle. Approximately 30 mph which is all the speed i expect for a 17.5 fiberglass boat. I think the carbs are clean.
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    1979 Evinrude 55 hp will not run full speed without choke.

    The compression is 140 psi on both cylinders warm.
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    1979 Evinrude 55 hp will not run full speed without choke.

    The compressions on the 1979 Evinrude 55975c were 140 psi on both cylinders. That was a warm engine. I plan to get the boat in the river tomorrow for a full power check out. I haven't done anything on the fuel issue except a clamp on the fuel line where a wire strap had been. The man at the...
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    1979 Evinrude 55 hp will not run full speed without choke.

    Thanks for all the input. Yesterday after removing the starter, I noticed that the first section of fuel line is only secured by a wire tie. The same section of fuel line has a clamp where it attaches to the fuel pump. It would swivel easily but would not pull off the tank fuel line...
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    1979 Evinrude 55 hp will not run full speed without choke.

    Thanks for your input on this engine problem. It has been a chronic issue with this engine. Various fuel tanks have been used with equal results so I expect that it is not a venting problem. I will, however, check that. I had a shop go through the carburetors, so I would hope they would have...
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