115hp Johnson Outboard Cooling System Questions Youtube Just got a few questions as i learn about these outboardshow hot should they run?and why is one bank running much hotter than the other?. my guess is blockag. The cooling system on an outboard is a very simple and compact application. water is inducted through the lower unit by a water pump impeller, and then forced upward to circulate throughout the powerhead, and eventually exits through the exhaust system. there are a couple of things pertaining to the outboard cooling system that need regular.
Johnson Outboard Cooling System Diagram This channel cannot be seen unless the powerhead is lifted off. water flows into the exhaust cooling area, water passage, and the heads. it then exits the heads and travels via the rubber hoses to the thermostats relief valves. i have also learnt that water then passes lower down, cooling the inner exhaust tube down to the prop exit. 11,551. jul 15, 2011. #2. re: 76 johnson 115 v4, no water flow (cooling system) that engine does not have the telltale feature. that came out on the 1978 models. you can test for water flow. after you start the engine when cold, hold you hand right behind the two exhaust relief ports at the top of the midsection. Ok so i've spent this summer learning everything that a turbojet 115 can offer as i like to say " pain in the transom " and the turbojet will be. but personally id just mix the gas in a 5gal can and a splash extra with the tw3 never hurts. run good gas and 91 for best results. the cooling system needs upgraded to anything bigger to be better lol. make sure all fittings are clear and hoses are. 0 thread (s) yes one of the best, most reliable "bang for the buck" outboards ever produced. very reliable, parts very available, run forever on the right fuel oil and care. these are 90 degree, cross charged engines. not the most efficient fuel wise, but you can but a lot of gas with the $$ you save on the purchase vs. a newer engine.
Johnson Outboard Cooling System Diagram Ok so i've spent this summer learning everything that a turbojet 115 can offer as i like to say " pain in the transom " and the turbojet will be. but personally id just mix the gas in a 5gal can and a splash extra with the tw3 never hurts. run good gas and 91 for best results. the cooling system needs upgraded to anything bigger to be better lol. make sure all fittings are clear and hoses are. 0 thread (s) yes one of the best, most reliable "bang for the buck" outboards ever produced. very reliable, parts very available, run forever on the right fuel oil and care. these are 90 degree, cross charged engines. not the most efficient fuel wise, but you can but a lot of gas with the $$ you save on the purchase vs. a newer engine. So make sure you've also got really good ventilation. alright, well take care and i'll catch you next week. in this video i experiment with cleaning the cooling passages in three outboard heads using different chemicals. i try using salt away, hydrchloric acid (muriatic acid) and white vinegar. Install correct test propeller and place outboard in a test tank or in the water. start outboard and run at 3000 rpm in forward gear for at least five minutes. remember, running outboards at high speeds in test tanks may disrupt water flow to gear case water intakes. make sure the outboard has adequate water flow.
Johnson Outboard Cooling System Diagram So make sure you've also got really good ventilation. alright, well take care and i'll catch you next week. in this video i experiment with cleaning the cooling passages in three outboard heads using different chemicals. i try using salt away, hydrchloric acid (muriatic acid) and white vinegar. Install correct test propeller and place outboard in a test tank or in the water. start outboard and run at 3000 rpm in forward gear for at least five minutes. remember, running outboards at high speeds in test tanks may disrupt water flow to gear case water intakes. make sure the outboard has adequate water flow.
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