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    Honda BF75L cooling water issues

    It's never overheated before. I ran it for several months even without the thermostat and no problems. this is a recent occurrence when I tried to use it this season. there's lots of chips and dings but the tell tale is strong so I don't think the blockage is on that end this engine exhausts...
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    Honda BF75L cooling water issues

    this has been a fresh water engine since I've owned it. roger that....I'll update after work today
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    Honda BF75L cooling water issues

    if I do as described, I should see air coming up as bubbles from the exhaust, right?
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    Honda BF75L cooling water issues

    yes I get that. I blew air INTO the block at the nipple where the pump pushes water to the block . it's my understanding that the water tube from the pump Y's at that point to feed the block and the bypass. I could feel air exiting by the thermostat so figured the jacket through the block is clear
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    Honda BF75L cooling water issues

    wow km1125, thanks for the insight. I blew air in the bypass connection and it came out the thermostat hole. so there's definitely flow through the block I'm thinking the water blockage is somewhere down to the exhaust . The only way out is through the telltale. I'm guessing that's why it's...
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    Honda BF75L cooling water issues

    update: I was able to blow out the water jacket and there wasn't much debris coming out. I think I'm all clear there. but what I'm noticing is no water or exhaust coming out of the two little exhaust holes on the back. I figure that's where the hot water should be flowing out...not the tell...
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    Honda BF75L cooling water issues

    thanks...I think they must have changed a bit by 1983
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    Honda BF75L cooling water issues

    I think my engine is slightly different than the one in the diagram. 1) I'll definitely try and flush it... I can't run it with the thermostat housing off. the housing is integrated into the intake manifold which also facilitates the fuel/ air mixture
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    Honda BF75L cooling water issues

    yes the first diagram made sense except the thermostat. it should be located on the left side of the cylinder head and it should extend into the inlet manifold. the
  10. C

    Honda BF75L cooling water issues

    I wish there was water flowing through the engine ....it's bone dry on the thermostat housing . I've got a blockage somewhere just trying to figure out the pathways so I can locate the blockages
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    Honda BF75L cooling water issues

    truly appreciate your help flashback...let me explain a bit better... the thermostat essentially closes a water pathway, then opens it when the temp rises. A water pathway would have two holes- a path in, and a path out . inspecting this engine I can only see a single hole. so when the...
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    Honda BF75L cooling water issues

    I'm sure they do too... I'm just not seeing it
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    Honda BF75 Hot and Weak Telltale

    I don't have a boat..just.the.kicker MOD EDIT: @Cpotts Adding your issue onto another person's thread is a hijack. Please review the forum rule on hijacking and feel free to start your own thread.
  14. C

    Honda BF75L cooling water issues

    I can't see how the thermostat releases water to the exhaust. it's housed mostly in the block, and partially in the inlet manifold there's a water pathway to the thermostat on the block side. (see first pic). If hot water from the block reaches the thermostat, it would open. But there's...
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    Honda BF75 Hot and Weak Telltale

    thanks for the reply flashback. I've got it in a large garbage can with the water level over 6inches above the pump. where the pump line splits between telltale/block, I suspect I have a blockage to the block side.
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    Honda BF75L cooling water issues

    also, the previous owner was running it without a thermostat. so water should be getting everywhere...technically I shouldn't be overheating. Maybe they took the thermostat out when they couldn't solve the overheating issue? I'm still a bit confused with the thermostat housing. Upon...
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    Honda BF75L cooling water issues

    thanks flashback...that helps. the confusing part is that the thermostat seems to be housed moreso in the inlet manifold than the cylinder head. and if I'm hearing you right, the telltale just indicates that the pump is working. it doesn't really participate in the cooling? it does get quite hot
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    Honda BF75L cooling water issues

    Water seems to flow down the curved galley in the manifold. that leads directly to the tell tale as far as I can see. Flow from the tell Tale is pretty good. looking for help determining the water pathways. As far as I can tell, water never reaches the thermostat housing which doesn't make.sense
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    Honda BF75L cooling water issues

    I've got the same problem on my 1983 BF75L. telltale is decently strong, but the water is really hot after about 1 minute. After 2 or 3 minutes the engine dies. It's in a big bucket with water level nice and high. I removed the inlet manifold and there's no thermostat! and it's pretty dry in...
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    Honda BF75 Hot and Weak Telltale

    I've got the same problem on my 1983 BF75L. telltale is decently strong, but the water is really hot after about 3 minutes the engine dies. It's in a big bucket with water level nice and high. I removed the inlet manifold and there's no thermostat! and it's pretty dry in the housing. I'm...
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