Yamaha 225 getting hot

[sibelius]

Friends,<br />I have a Yam 225(-89)that has been sitting in a barn for 3 years not used. Started it up a couple of days ago and it started immediately (fresh gas). I used ear muffs for cooling water and no oil in fuel (auto lube system). Water came out of the pee hole and everything seemed to work fine. Then I took the cover off and felt the block, fairly hot. The water coming out through the propeller hub was warm but the water through the holes just abobe the anti cavitation plate was steaming. I let it run for 15 min. and still hot.<br />How can I verify that the cylinders get oil?<br />Should the water above cav plate be really hot? (never used ear muffs before)?<br />Other things to do when the engine have been off duty for 3 years?<br />Any frequent problems with yam 225 (-89) to consider?<br />Thankful for all replies!

 

[steve forsythe]

Re: Yamaha 225 getting hot

I dont think your motor would run very long if the cyl. were not getting any oil. On my 200 merc. when i first start it with the muffs on it doesnt pee at all. Once the temp rises over 100 it starts to spit/pee. Once the temp reaches 135-140 it pees, but not real hard. The water feels really hot coming out. Wouldnt that water be about 130 degrees? I dont know if that is normal or not, but as far as the oil goes, i would pre-mix until you find out for sure if your oil pump is working properly.

 

[sibelius]

Re: Yamaha 225 getting hot

Thank you very much for the reply!<br />Any ideas on how I can make sure that the oil pump is working?

 

[letsbarbq]

Re: Yamaha 225 getting hot

sibelius,<br /><br />i'm no wiz but i purchase a 30 shop manual and it has all the answers to the prblems. did you say cylkinder getting oil? let me read up on that and let you know.<br /><br />but purse snatcher is correct. how long do you think you can run it without oil. you say you ran it for 15 mins already... i bet you have oil cause if you didnt,, it would have over heated in seconds.<br /><br />i'll let you know later. but i have a 88 yamay 150. its the same as your in the manual. and mine was sitting for a year. i decarbed it, change lower unit oil made sure fuel was good, and pump water good. i start it. ran it little for a few hours. then i went home and changed the water pump. now i'm am in the process of hooking up a water pressure gauge to monitor my new water pump pressure. i'm gonna note the pressures at certain rpms. then i'm gonna compare them to the factorys rate and then...log it. so in the future i can monitor the water pressure and know when it is falling. <br /><br />just my thought. might be too much trouble for you.

 

[pthein]

Re: Yamaha 225 getting hot

On the port side of the engine to the rear of the start/battery selonoid is the oil pump. It sits right below the oil tank. If you follow the oil line from the tank you will find the pump. There will be 6 oil line going from the pump to the respective cylinder intakes. Somewhere on each of those six lines is a clear portion where you can see the oil moving when the engine is running. <br /><br />As for MX to be done after a long sit, I would suggest the following.<br /><br />1. Change the lower unit oil. Check for water or metal in the oil. Also pressure and vacuum check the lower unit.<br /><br />2. Remove the prop and grease the spline. <br /><br />3. Change the impellers. Dont just change the impeller, use the whole rebuild kit (approx 50 bucks) which includes the impeller, bottom plate, cup, tons of gaskets and seals. <br /><br />4. Fresh fuel - make sure to run ring free and if the fuel wont be used within 4-5 months, use a fuel stabilizer. Dont forget fuel filter changes. There is a small on under the cowl as well as the water seperating fuel filter - change them both. <br /><br />5. Fresh oil - Both in the main tank and remote, Use YamaLube. When oil sits for a while it get water in it and gels. Also there is a small oil filter in the rear of the remote oil tank. <br /><br />6. Run the engine and decarb each cylinder. <br /><br />7. After decarbing, replace the spark plugs.<br /><br />(This would be the point when I would do the compression check. The engine should be warm, carbon will have been removed and the compressions should have returned. If you do it before you may get a lower than actual compression after sitting for so long. Basically you have to give things a chance to reseat after sitting for so long.)<br /><br />8. Finally do a final tune on the motor to include linkage adjustment, carb sync., timing, etc.<br /><br />Dont forget to check all the electrical - batteries charged, battery cables in good condition, connections clean, inspect throttle and shift cables, etc. Inspect your tilts and steering for leaks and repair as necessary. <br /><br />If you do all of this you should have a reliable engine!<br /><br />Hope everyone agrees on what I have said - This is what I did and I have reliable engines!!!

 

[sibelius]

Re: Yamaha 225 getting hot

Thank you again, you are really giving me good answers, and of course new questions since I am definately a novice in these matters. The oil in the lower unit is now changed and as soon as I have a chance I will start her up again to see if I can verify the oil flow from the pump. Getting afraid though that the oil is not up to it. The oil tank is full and the proposal is to change it all. Is there a check I can do or something I can add to it to revitalize? Then the other checks, sounds to me like I need special equipment to performe them, compression, timing etc. I feel like an idiot having to admit that I dont know what decarbing is, I read other posts and guess that I need a special spray to accomplish this, product names? brands? (hopefully available in Sweden)?<br /> <br />Let me say that I am impressed by the quality of advice that you are offering on this site!!

 

[DJ]

Re: Yamaha 225 getting hot

Sib,<br /><br />If you're worried about your engine getting oil-do the following.<br />1. Get as much of the old oil out as possible from your injection tank.<br />2. Refill and mark the level of oil in your oil injection tank. <br />3. Pre-mix 50:1 a measured amount of fuel in your empty fuel tank-say 12 gallons. This will ensure your engine is getting oil. Go out and run the engine on the pre mix and closely monitor the oil level in the tank. If it goes down, the oil injection is working.<br /><br />It will smoke alot-especially if your oil injection is working, but you won't burn it up.

 

[rbu]

Re: Yamaha 225 getting hot

Sibelius,<br /><br />If your engine is an 89 255 Yamaha, it should be an Excel model, unless you have some sort of international model. I also have that model engine. There is a few things you should know. <br /><br />First of all, Yamahas do not like to run cool on a garden hose. They have a tendency to overheat. <br /><br />Second, if the motor sat for a while, you should look to clean/replace the bypass valve and waterpump. When Yamahas sit for a while, this bypass valve can cause water flow to be restricted. You will still get water coming out the pee-hole (this is nothing more than a pressure bleed hole). Sometimes all it takes to free up the bypass valve is to start the engine up and open up the throttle soon after. However, the boat has to be in the water. You won't get enough water from a garden hose to do this. And I wouldn't suggest ever running up the rpm's while using a hose. I had this problem at the start of last season. My engine kept overheating on the way out. The problem was the bypass valve. I changed it and all was fixed. It probably would have fixed itself if I were able to open her up sooner, however, I have a long ride through a no-wake zone before I can get out to open water.<br /><br />As for the engine oil, all you need to do is get a 6 gallon tank and premix the gas 50:1 Then run the engine off the 6 gallon tank. Unhook the linkage between the oil pump and the lower carb and push it forward to simulate full throttle on the oil pump. Then pull off each of the oil lines that run to the cylinders and check for oil flow.<br /><br />I would also suggest getting a manual for this engine and read up. Seloc makes a pretty decent manual.<br /><br />Good luck!

 

[koltta]

Re: Yamaha 225 getting hot

Hi friends!<br /><br />I just bought a service manual about outboards (over 700 pages) and there is very good fvigures an diagrams about Yamaha v4/v6 engines. Sibelius, i can scan them an send to you if you want.<br /><br />Br. Kari Kettunen

 

[pthein]

Re: Yamaha 225 getting hot

Yamaha actually uses a popet valve and a thermostat in their engines that can cause several problems if they dont work right. The popet valve allows pressure release of the cooling systme while the thermostat is closed and then the thermostat opens to allow better cooling once the engine is heated up. If the popet valve stays closed and the thermostat doesnt open, the engine will overheat. I recomment changing both of these items after a long sit. They are both inexpensive insurance to set a baseline after a long period of not running.

 

[sibelius]

Re: Yamaha 225 getting hot

Kari,<br />I would be very thankful if you would like to scan and send me the parts of your book that concerns my Yamaha 225 (-89). I guess you have a lot of interesting reading with your 700 pages!!<br />Please send to:<br />sibelius99@hotmail.com<br /><br />Thanks to you all for your responses, I always wonder about the phrase "if it is not broken dont fix it". In my case I think that I will wait for the first chance to take the engine for a ride and then se if I still have indications of overheating. Do you think that I can trust the warning signal for overheat? Does anyone know how hot the block should be under normal operation, not above 100 deg C i guess?