"Popit" valve

K

ken 120

New member
Noticed that when the engine is running water is coming out from the hole where you flush the engine- (just below the engine cover where you remove the rubber cover to insert the flushing attachment on the rear of the engine) -guy next to me in the marina says the "Popit" valve is stuck- before I start is this something that can be freed or do I replace it??

Thanks

Ken
 
You can take the small valve out, clean it and replace all gaskets and seals and you will be good to go. You may find that corrosion in the general area may have caused the sticking if you operate in salt water. The part example is number 4 at this site: http://www.boats.net/parts/search/Honda ... parts.html
It is an important part, as without it, too much water will be relieved and not allow the engine to be properly cooled. If you are doing this job (which by the way is reasonably simple if the bolts are corroded in place), its a good time to go ahead and replace the thermostat as well as conduct all other Honda recommended maintenance to the powerhead (and yes, all of that stuff is not hard to do with very basic skills and tools).
 
A poppet valve is spring loaded diaphragm and opens at higher rpms. A stuck open poppet would cause it to overheat at idle rpms.
 
From WIKI:
"A poppet valve consistins of a hole, usually round or oval, and a tapered plug, usually a disk shape on the end of a shaft also called a valve stem. The shaft guides the plug portion by sliding through a valve guide."

For instance a 4 stroke outboard engine has poppet valves to let the gas in and out, 16 ea on a Honda 4 cyl. Thermostats are poppet valves. On a Honda 150, both the flush and relief valves are poppet valves.

So Chester is asking a good question. In order to answer the valve question correctly, one would have to know what the valve is, and that would depend on the engine.

So, Ken, what is the make and type of the engine? And, where is the water leaking? Then you get a better answer.

Boris
 
Thanks for this comprehensive analysis of my problem- I have a 90hp made in 2001 - any other comments appreciated.

Noticed- when I dropped the round rubber cover overboard-the cover that when off exposes the opening where I attach the nozzle looking flush device- rear of engine just below cover cover. Without this rubber cover a respectable amount of water was coming out this now exposed opening-"pee hole" still has a good stream coming out of it.

Ken
 
A poppet valve is only a type of valve, such as a ball valve. So a poppet valve can be used in many different applications: a thermostat, an intake/exhaust valve, a relief valve, etc. Completely different in appearance and application, but still a poppet valve. And that's what I was trying to say earlier ( and obviously I wasn't too clear.)

So for Ken, my comment is that I hope that srbaum can help you, because I couldn't find any pictures of a Honda 40, to see what the flush connection looks like. All I can add is that the Honda 150 has a check valve on the inlet to the flush port. This is probably the valve to which your neighbor referred. This check valve is there to prevent cooling water from coming out the flush port when the motor is running. If that check valve leaks, your symptoms would appear. Just find and replace it and good luck.

For jennykatz, if you've changed your thermostat (which is a poppet valve,) and there is no water leaking out of the flush port, you might think about checking to see if the cooling passages in the engine are blocked. "Salt will begin to precipitate out of seawater at approximately 148° F, forming deposits on engine cooling passages, which ultimately will lead to poor water circulation and overheating." That's a quote from Ocean Navigator. So, if your engine ran hot for a period of time, and then you changed thermostats, salt may have clogged some cooling passages. You might look into the thermostat cover and see if there are any deposits there. Or talk to a knowledgeable dealer.

Years ago, I had a small Honda outboard which died on me, at 2 AM. When I took it to a dealer, I was told that Honda's ran hot and salt got deposited leading to overheating. He cleaned out the passages, gave me a new cooler thermostat and wished me good luck. So it can happen. By the way, I then bought Evenrude 2-strokes until they disappeared.

Boris
 
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