Good morning, all. I recently purchased a 1962-ish 75 HP Johnson in absolutely terrible condition. It has been out in the weather for years, and required a complete rebuild. Basically, anything made out of rubber had to be replaced. Ive successfully rebuilt the engine and lower unit, and Im to the point of replacing the hoses. Therein lies the problem. When I got it, most of the hoses were missing, and those that were there were only connected on one end. Ive scoured the Seloc manual for this engine, and while it provides nice wiring diagrams, it doesnt provide much of anything about the hoses. Ive been reading your posts, and I think you guys are my best chance for figuring out the correct hose routing for this unit. I apologize in advance, because this is going to get rather lengthy.<br /><br />There are a total of 13 ports on the unit. They are located as follows (the numbering is mine, and totally arbitrary):<br />1) Midway down the starboard intake throat, facing forward.<br />2) Top center on the carburetor, facing aft.<br />3) Below the port side intake assembly on the forward half of the block, facing forward.<br />4) Port side of the unit under the power head, facing to port. This connection is not on the powerhead itself, but on the base to which the powerhead mounts.<br />5) Top of the block on the starboard side, just forward of the starboard side cylinder heads, facing to starboard.<br />6) Below the starboard side intake assembly on the forward half of the block, facing to starboard.<br />7) Below the starboard side cylinder heads on the main portion of the block, facing aft.<br />8) Vacuum connection for the fuel pump<br />9) Fuel in on the fuel pump<br />10) Fuel out on the fuel pump<br />11) Water in for the water choke<br />12) Water out for the water choke<br />13) Vacuum for the water choke<br /><br />Of those 13 connections, Im sure that the fuel pump input #9 connects to the fuel tank, leaving me with an even number of connections. The output from the fuel pump #10 leads to the carburetor fuel input #2. Im fairly sure the vacuum supply to the fuel pump #8 is the forward suction port on the starboard throat, #1. Beyond that, Im starting to guess a bit.<br /><br />The water choke works by sensing the heat of the cooling water leaving the engine. The hottest water in the engine will come from around the cylinder, which is connector #5 on the starboard cylinder. Therefore, I believe #5 is a hot water supply for the water choke inlet, #11.<br /><br />Thats 7 connectors down, 6 to go, which is three hoses. One will be vacuum, one will be water, and I have no idea what the third one will be.<br /><br />Thanks in advance for sticking with me through this lengthy explanation. In case its needed, heres what I know about the engine. Please ask if theres anything else I can tell you.<br /><br />The engine is a 1961 to 1965 Johnson 75 HP V4 2-cycle engine. The model number is missing, so thats as far as I can pin it down. It has a Type 1B carburetor, downdraft, double barrel, with fixed high-speed orifice and low speed needle valve. It has a generator (not an alternator) and a Distributor Magneto ignition system. <br /><br />Thanks for your help!
