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Thermostat questions??

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boerne14

New member
Hello, Ive got another question about my 2000 50hp johnson. How can i tell when the thermostat is open or closed? Im not sure if its working properly. Theres a water line running stright out of the thermostat that acts like a discharge. Now water is always flowing out of that hose and the flow rate never changes even when goimg from a cold start to warmed up. When I first fired the motor up while cold i watched the head with a thermal imaging camera and watched the temp climb slowly to about 175F and then stay there and hold steady at idle speed. Now according to my seloc manual the head should never go over 140F at like 3000 rpms but my over heat alarm never went off. But anyways my question is where is the water suppose to leave the motor with the thermostat either opened or closed. With out taking the thermostat off is there anyway to test weather or not its working properly and the motor is cooling correctly? Theres also what apears to be a discharge at the back of the midsection just below the the head but no water is being pumped out of there. Is there suppose to be? It appears my water pump is working correctly as the stream out of the dicharge hose i mentioned erlier is quite strong and steady.

Thanks Matt
 
And when i say the head temp was 170F it was acually pointed at and reeding around the back side of the thermostat housing. I didnt actually get a reading on top o the head, like between the spark plugs but i know it wasnt anywhere near 170F. It was much lower.
 
Its a two stroke and i dont have the model # on me right now. When i run off of ears i always gate back the water preasure a lil bit. But ill prob throw a new pump and thermostat in it to be on the safe side. When the motor reaches opperating temperature and the thermostat opens, where does the water traveling through the head discharge the motor? I just purchased the motor about a month ago and it runs great. Ie been going threw it with a fine tooth comb making sure every componet is working properly to prevent any costly issues later on and trying to learn as much as i can about it.
 
Water in the gear oil is not acceptable on a 2000-50 HP.------------Gears / bearing are just too expensive to replace !!
 
Thank you kimcrwbr1 for the advice and info. I ran the motor on a static water source today and it all worked as you siad. So far on this motor i drained, pulled, and cleaned the fuel tank. Replaced all the fuel and oil lines, primer bulbs, and fittings. Replaced the stock in line fuel filter with a transom mounted canister style water seperator/filter. Pulled the carbs "the bowls were spotless" and soaked them in seafoam. Pulled, cleaned, and tested the VR02. Pulled and cleaned the pulse limiter. Replaced plugs and plug wires. Soaked the cylinders in B-12. I back flushed and soaked the water pump and thermostat with good old fashon CLR. I replaced the main seal on the out put shaft and lubed all grease fittings. I also tested all the system check componets(no oil/low oil/high temp/check engine). When I filled the fuel tank for the 1st time i added seafoam and sta-bil(the blue kind) and plan to do so every fill up. Thats where im at with the motor so far. Is there anything you think ive missed? She ran great when i baught her but did all this as a preventitive measure and glad i did as i discovered a few issues that would have soon led to a break down. She purrrrrrs like a kitten now and feel alot more comfortable taking her out. Im gonna order a new impeller and thermostat on payday.
 
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