Mariner 2 hp .

[TrebyM1]

Hi everybody. I am new to this, so hopefully i can get my problem across to you. I have purchased an old Mariner 2 hp engine. I have fitted a new impeller and she runs well with plenty of water coming out of the exhaust holes in the leg. However water is also spurting out from the little slot in the exhaust guide (plate) between the 2 exhaust gaskets (which i have also replaced). This slot is just behind the carb. There is obviously a reason for this slot as it is man made. From what i understand, this slotted exhaust guide is common on all of these engines together with their Yamaha counterpart. Can anybody help.
Thanks from a grateful but wet boater.

 

[alldodge]

Welcome
To get some more ideas is post a pic and also the serial number of the motor or at least the year

 

[airshot]

Yes, pics please....I have what might be a cousin to yours. Mine is a Mercury 2.2 hp (1985) and no leaks in that area I think from your description... Good pics will let me take a closer look if they are the same motor....

 

[TrebyM1]

Thanks for your replies. Serial No. 6A1-072315. Mariner 2M. I am pretty sure that the 2.2 Mercury does not have the exhaust guide plate. Pics attached. Hope clear enough. Look forward to your help.

 

[alldodge]

Looks to me like the pee hole, lets ya know the water pump is working. Airshot would know for sure

 

[Faztbullet]

Pretty sure that is a vent. Only way water would come out is if it climbing driveshaft or gasket not sealing. This would also happen if slinger is missing or too deep in barrel

 

[TrebyM1]

Looks to me like the pee hole, lets ya know the water pump is working. Airshot would know for sure

Can't be the pee hole as its facing the wrong way (its the carb end) so you will get a soaking in the boat. Also, i understand that the pee holes are the same holes as the 4 exhaust outlets on the front of the leg ie prop side.

 

[airshot]

Does your motor have a telltale hose comming out the back ? My merc does, while there are some similarities there are also some differences. They way your power head sits on the lower is different from mine. What year is your Mariner ??

 

[airshot]

After looking more closely, I think yours is much newer than mine. Haven't found a service manual for mine yet, so hard to compare the "inards"...

 

[TrebyM1]

Hi. No, there is no telltale pipe from theses engines unlike the 2.2 and above. The cooling water comes up the tube, circulates around the engine and comes back down the leg and is forced out of the four exhaust holes. This is all happening as it should but the problem still exists

Pretty sure that is a vent. Only way water would come out is if it climbing driveshaft or gasket not sealing. This would also happen if slinger is missing or too deep in barrel

I am sure your right that it is a vent. What you are saying makes a lot of sense. How does water climb the drive shaft though and which gasket are you referring to as they have all been renewed. Also, excuse the ignorance but what is a slinger ? Exploded drawings make no reference to this.

 

[QBhoy]

Yes, pics please....I have what might be a cousin to yours. Mine is a Mercury 2.2 hp (1985) and no leaks in that area I think from your description... Good pics will let me take a closer look if they are the same motor....

This is a Yamaha engine, to be fair.

 

[TrebyM1]

This is a Yamaha engine, to be fair.

Yep. Identical to a Yamaha 2hp.

 

[Faztbullet]

On top of the water pump housing there should be a o-ring or rubber sleeve. this is a water slinger. At low speed water will climb the shaft, the slinger prevents this as this is what rust/seizes driveshaft spline into crankshafts

 

[TrebyM1]

On top of the water pump housing there should be a o-ring or rubber sleeve. this is a water slinger. At low speed water will climb the shaft, the slinger prevents this as this is what rust/seizes driveshaft spline into crankshafts

Aha. This sounds good !! My next job therefore is to remove the leg and check it out. Many thanks.

 

[TrebyM1]

I think you have hit the nail on the head. Having dismantled the housing i found that rubber sleeve (water slinger) is floating about on the lower part of the drive shaft (just above the impeller) ie not firmly fixed in the upper groove of the housing where it should be. This upper groove has badly corroded and the slinger won't stay in it. Do you have any suggestions as to how i can rectify this ie plastic metal or...............
Thanks again

 

[Faztbullet]

Build up the shaft with some Blue Magic 18003 epoxy and install slinger we dry and shaped

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[TrebyM1]

Thanks for that. I have just purchased J.B Weld steelStik steel reinforced epoxy putty. This sounds very similar to your suggestion and will give it a try. Not too sure how i am going to get a good seal in the 'rounded' groove though............i could purchase an oversized oil seal to get a tighter fit ?

 

[TrebyM1]

Eureka ! I fitted, with a bit of difficulty, a 1mm oversize oil seal/slinger and now, no more water spurting out. Thank you everybody for your suggestions, especially 'Faztbullet' without whom, i would still be struggling. Happy Christmas to all.

 

[QBhoy]

Eureka ! I fitted, with a bit of difficulty, a 1mm oversize oil seal/slinger and now, no more water spurting out. Thank you everybody for your suggestions, especially 'Faztbullet' without whom, i would still be struggling. Happy Christmas to all.

Excellent news. I just picked myself up a ‘88 Yamaha 2b, non running. I’m blaming you for this, haha. Always wanted one. Just got her running today. Cleaned up the points and brushes…new plug and fuel…stop switch was showing a circuit when it shouldn’t, from corrosion in there. Sorted that..carb clean…runs like a wee sewing machine now. Amazing wee things. She’s cooling well at the moment I’m sure…but about to change the water pump shortly. Got the bolts out the gearbox to mid section…but she’s stubborn to come apart, during the quick couple of minutes I had at it. I’ll give it a proper attempt soon. When it’s not dark and cold !

 

[TrebyM1]

Congrats ! They are great little engines but the stud heads tend to break as the engines are quite old and threads very corroded. If that does happen, i find that a couple of days of regular soaking in WD 40, then attach 2 nuts to the remaining part of the thread, tighten one against the other, hold the top one in a spanner, then put a spanner on the bottom one and turn anti clockwise and hopefully it will unscrew. Use an extension on the spanners for extra leverage. Good luck.