1998 25 hp Mercury - Not Peeing

[agengo02]

Just bought a used '98 25 hp off a guy. Motor is in great condition under the cowling and fires up first push (electric start), but it does not pee out of the pee hole. I changed the impeller out (old one looked to be ok; really tight fit in the housing-I had to bend the arms around to fit) and same thing; fires up, no pee. I have read a few things about the T-stat could be closed but how long of run time should it be before it should open up again? I never let it run more than 10-15 seconds since I don't want to do any damage. No clogs anywhere I can run a piece of weedeater line. In fact, not even dirty in any of the lines. The muffs are correctly in place with excess water running out.

I also can feel air pumping out the pee hole and water does come out of the prop. The motor does not get hot to the touch or anything, but I only let it go for 20 seconds max.

Serial #: 0G685032

1998 25 EH


Thanks for any replies.

 

[Maxz695]

Re: 1998 25 hp Mercury - Not Peeing

i,m having the same issue today on my 40 HP I took a hose and backflushed the thermostat with the housing off. I removed the hose from the left side and backflushed it without the lower unit on. I then added the hose to the other side Pee hole and flushed it as well all looked good i even blew up the water tube and flushed it that way as well. I put it back together after cleaning out the waterpump expected full flow and got nothing but minor smoke coming through the pee hole.I think my waterpump and base need to be changed even though the impeller is in good shape. You say the engine doesn,t get hot when started for a few seconds. soulnds like your hose is clogged or the left side water unit there is clogged remove the hose from the left side of the block and see if you have water flow there.if so then either your fuel pump is clogged or the pee hole tube. They water hose does go through the fuel pump and it can get clogged. you would have to totally remove the fuel pump in order to run a cothes hanger through it to clear the port. To back flush you would need a copper 1/2 half inch reducer to 3/8 a cut garden hose clamped to the 1/2 copper reducer and a piece of 3/8 copper pipe (better if soldered) and a peice of 3/8 fuel lin long enought to reach the areas to backflush. My impeller exploded a while back and I even found parts of it in the T stat housing

 

[agengo02]

Re: 1998 25 hp Mercury - Not Peeing

Thanks very much for the reply. My hose connects straight to the T-stat on the back side of the engine so I don't have a hose running on the side. I haven't pulled the fuel pump out yet, but it is on my list of stuff to check.

 

[Maxz695]

Re: 1998 25 hp Mercury - Not Peeing

I just took my pump apart again checked it all and put the outdrive in a barrel with water turned the shaft and nothing I suspect the base plate is shot. I,m gonna have to get a complete kit with evrything. You may want to remove the thermostat to see if it pees then. It won,t hurt the engine you can relace it later. if the thermostat is not opening replace it. it shouldn,t take too long to open but by removing it it should pee almost imediately that will tell you the waterpump is ok. if not replace the entire waterpump and base

 

[agengo02]

Re: 1998 25 hp Mercury - Not Peeing

Thanks again. Any tips on getting the T-stat off? I tried to see if I could easily pull the hose that attaches to it off but it seemed like I needed to put more elbow grease on it and I didn't want to risk messing anything up.

 

[sxmerc]

Re: 1998 25 hp Mercury - Not Peeing

I'm not sure what the ambient temperature is where you live right now, but some of these motors will take a few MINUTES to heat up enough to allow the thermostat to open to get a good tell tale. As mentioned above, take the thermostat out, reinstall the thermostat cover, and then start the motor and see if you have water from the tell tale. You should replace the thermostat as part of a water pump service anyway. Good luck.

 

[Maxz695]

Re: 1998 25 hp Mercury - Not Peeing

twist the hose then pull you could use a pair of plyers to get it to twist. use a rag between the hose and the pliers do not squeese to hard it sould come off then

 

[floatmiboat]

Re: 1998 25 hp Mercury - Not Peeing

Hi,
I have a 1997 25 hp merc, it can take about a minute or so for my thermostat to open when the water is cold, say even a couple of degree's celsius outside. They are supposed to open at a certain temp[I forget what] but, you can check the stream with a instant read thermometer for cooking[4 bucks].

 

[agengo02]

Re: 1998 25 hp Mercury - Not Peeing

Thanks for all the replies. So I took off the thermostat and still no stream. In fact it was bone dry in the engine compartment just before the t-stat. Dropped the lower unit again and had some good head scratching time. No obstructions through any of the tubes/hoses and I can blow in where the t-stat and feel a hard stream of air down the lower unit so there is nothing blocking it. After looking at some pics online I have determined that my whole water pump assembly is missing at least 1 gasket. I am thinking that I can just pick up a full water pump kit and just a full replacement of all washers, gaskets, etc. The only reason I can think of for a missing gasket is the previous owner may have inadvertently knocked it off before he put it up in his garage.

I am trying to understand the whole cooling process. The shaft spins, which spins the impeller, which forces water up and through the engine right? Because my shaft spins which would spin the impeller (little key is in tact) and there is plenty of water flow through the muffs, but I get no water pressure moving up the lines.

 

[agengo02]

Re: 1998 25 hp Mercury - Not Peeing

Oh and I did wait until the engine started heating up. I didn't let it get too hot, but it was starting to get too hot to touch without even a sputter from the pee line.

I also put it in gear thinking that possibly the shaft isn't spinning. Well it dropped into gear easily and spun the prop, still no water coming out.

 

[Maxz695]

Re: 1998 25 hp Mercury - Not Peeing

Yea that would be the best thing to redo the pump. you,ve done everything i,ve done with still no progress .Gonna do it right this time or not at all

 

[agengo02]

Re: 1998 25 hp Mercury - Not Peeing

Ok so I am about to order the whole pump kit. So assuming I install everything correctly and it is STILL not peeing, what would be my next step? Could it potentially be something serious? I got the boat/motor/trailer for a really good price so worse comes to worse I can find another 25 hp merc to throw on the back.

 

[carholme]

Re: 1998 25 hp Mercury - Not Peeing

ng02;

Not sure if you have the parts and service manual for your engine Serial #: 0G685032.

Your engine is a model:

1025301UD MERCURY 1998 25

Parts listing:

http://www.crowleymarine.com/mercury-outboard/368.cfm

Service Manual:

http://1manual.com/Mercury manuals/Service Manual PDFs/TwoStroke/826883r2/cover.pdf

Providing that you have all of the parts (items 8 thru 11)installed correctly per this link in the parts listing:

http://www.crowleymarine.com/mercury-outboard/parts/368_160.cfm

and items (18 thru 28) in this link:

http://www.crowleymarine.com/mercury-outboard/parts/368_190.cfm

I would remove the LU, install it in a water tub and ensure the waterpump installation is correct by driving the LU with a electric drill and socket at the engine driveshaft and ensure that the pump is outputting. Then doubly ensure that there is not a problem at the top of the long water tube by forcing hose water pressure up through the water tube (thermostat removed) and seeing if you now have water flow through the powerhead.

I would really want to know that seal, item 9 is positioned correctly around the top of the water tube and not crushed in there.

Hope this might help.

Gerry

 

[agengo02]

Re: 1998 25 hp Mercury - Not Peeing

Gerry,

I didn't have ANY of the information from the links you posted so thank you very much! Looks like I am going to try the LU in the tub of water thing today when I get off work and see. You mentioned a seal at the top of the copper water tube. I can't say for sure that it isn't crushed and not letting water flow though. When I drop the lower unit the copper tube stays attached to the little rubber boot on the LU and never stays up in the engine so hopefully it will be something small like that!?!

Thanks again for giving me more information!

 

[will941s]

Re: 1998 25 hp Mercury - Not Peeing

you can also spray some water in through the thermostat hole and see if water comes out the bottom of the motor. But forcing it up the shaft IS the natural way it would come in. How was the impellar you took out? Any fins missing? Could be something stuck in a water passage. If you force water (not a whole lot of force) through the t-stat passage it could dislodge something stuck in there and force it back out. Mine takes forever to pee on the water hose (really cold water) but in the river it will pee after about 2 minutes (after the t-stat opens). Powerhead is going be somewhat hot, my gauge reads about 120-125 degrees off the head water jacket, so thats a little uncomfortable to touch, but I can hold my hand there. Why don't you try to let it run for a little while in the yard. Keep your hand on the head and exhaust jacket to make sure it's not getting too hot and wait on it to pee. If it starts to burn your hand, or you can smell paint shut it off and continue your search. It it does pee......then your good. Or get a thermo temp gun and monitor it off the head, it if reaches about 160 degrees, then it's too hot.

 

[will941s]

Re: 1998 25 hp Mercury - Not Peeing

Your tube should stay in the motor......should disconnect at the LU when you drop it. If the boot is missing on the bottom of the motor then you could be losing alot of water pressure. Look up in there with a good powerful flashlight.

 

[agengo02]

Re: 1998 25 hp Mercury - Not Peeing

Will thanks for the response. The impeller wasn't in bad shape by any means. All fins were intact and no cracks or anything. I had the new one so I went ahead and replaced it. About the copper tube: there is nothing trying to keep it in the motor. I mean when I drop the lower unit the tube drops with everything else so it is definitely not connected to any type of rubber boot or anything. I always thought it just butted up against something on the inside?

 

[will941s]

Re: 1998 25 hp Mercury - Not Peeing

When you run the motor, is there alot of water coming out from where the LU meets the mid section or that area? Some water coming out there is fine, but it should'nt be a heavy flow. The tube always stays up in mine. It should be pushed into some type of grommet where it meets the powerhead, then when you remove the LU it should come loose right at the top of the impellar housing (slides into a grommet there). I usually grease the end of the tube when re-installing the lower to help it slide into that grommet better and easier. Look at some diagrams for the part on the bottom of the powerhead, then look for it on yours. Make sure it's there or the rubber is stil intact.

 

[agengo02]

Re: 1998 25 hp Mercury - Not Peeing

No water coming out from there at all, just the normal (I assume normal amount) amount coming from the muffs and the prop. The more I read I am thinking it is going to be where the tube meets the fitting in the motor. Mine stays attached with that grommet to the LU, but never slips into any type of fitting up in there. I am going to start with a reverse flush from the t-stat down and maybe that will push that little grommet down through or possible reveal that I am missing that grommet. I really think that will be my problem because everything else seems to be operating perfectly.

What's going to be really bad is I am leaving for the weekend this evening and I will be mad at myself if I get it running right and not be able to take it out on the water!

 

[will941s]

Re: 1998 25 hp Mercury - Not Peeing

HA...flush the heck out of it, put it back together and try to run it for a few minutes. Give it time to really heat up and open that t-stat. It's a AWESOME motor though.