1966 merc 110 (9.8 HP) cooling water questions

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valcour

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I attached a set of "earmuffs" and garden hose to the water intake under the bottom plate, and when I run it I get water and exhaust out through the prop. There is also a small amount of exhaust coming out higher up on the back of the motor under the powerhead, but no water.<br /><br />Is this motor supposed to pee out a stream from the upper exhaust like the newer motors do or does it only come out through the prop?<br /><br />When I looked closer I found a slotted machine screw on the right side about the same height as the upper exhaust port labeled "flush". Once I finally broke the screw loose I found the hole packed with a white sand like material. I poked around with a wire and got it out as far as I could see, but I didnt want to shove the wire in to far. Should water come out here if the screw is left off? Any idea how far I can poke a wire in there, and could I dammage something if I go to far or what is the best way to clear it out? How do I use this "flush port" if i can clear the blockage? Adapt a garden hose to it or what? Thanks.
 
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dajohnson53

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Re: 1966 merc 110 (9.8 HP) cooling water questions

The flush port is for flushing with a hose (with the merc 9.8's that I'm familiar with, you're NOT supposed to run the engine while flushign through this port, I would assume the same for yours until told otherwise).<br /><br />You get a hose adapter at a dealer. I actually got mine at a non-merc dealer. Mine is kind of fancy and surprisingly expensive, but it has an on/off valve and quick disconnect. I believe you might be able to find a simple hose adapter at a hardware store.<br /><br />As for running it on the muffs - I'm not actually familar with your particular vintage of Merc. I am familiar with a little newer ones - a '67 or so silver band, a little newer red band and my current '74 blue band. None of these could be run on the muffs just because of where the water pickup is located on the underside of the A/V plate mskes it impossible to get the muffs in place. It sounds like yours is different? Maybe not. I've always had to run them in a large bucket or garbage can full of water. By the way, both of those have a tell tale - so I'm thinking yours might but I don't really know for sure.
 
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valcour

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Re: 1966 merc 110 (9.8 HP) cooling water questions

Thanks for the reply. Sounds like they are the same - I was able to fit the muff on the bottom of the plate without hitting the prop, but it will only work when it is out of gear. Where does the tell tale water come out on the '67, and how much water should I expect - a full stream or just a dribble?<br /><br />Am I correct in assuming that your adaptor threads into the flush hole, and you run water through it with the engine off just to clear out the salt water (apparently this would not flush the pump)? Does the water escape from the tell tale, through the middle of the prop, of both?<br /><br />Any idea how best to clear out the passage from the flush screw to where ever the outlet is?
 
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dajohnson53

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Re: 1966 merc 110 (9.8 HP) cooling water questions

Originally posted by valcour:<br /> Thanks for the reply. Sounds like they are the same - I was able to fit the muff on the bottom of the plate without hitting the prop, but it will only work when it is out of gear. Where does the tell tale water come out on the '67, and how much water should I expect - a full stream or just a dribble?
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Like I said, I'm not specifically familiar with your engine, but on the 9.8's I've seen with a tell tale, the outlet is on the starboard side of the lower cowling (right side of the engine as you're facing forward) , a little hole from inside of the compartment to the outside - with a fitting on the inside for a rubber hose to attach to. The hose goes up to the engine, can't remember exactly where. The water stream exits the lower cowling kind of in the vicinity of where that flushing plug is.<br /><br />If you have a tell tale, and if it's operational, and if the water pump is strong, and if the passages are clear, it should be a strong, steady stream. Maybe takes a couple of seconds to get going when you start the engine, maybe is a little stronger at WOT than idle.<br /><br />
Am I correct in assuming that your adaptor threads into the flush hole, and you run water through it with the engine off just to clear out the salt water (apparently this would not flush the pump)? Does the water escape from the tell tale, through the middle of the prop, of both?
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Yes to all, both to the last question. Re: the pump - that's what I've been told. Also, my OEM owner's pamphlet says not to use the flush port while the engine is running, implying it doesn't adequately supply the pump.<br /><br />
<br /> Any idea how best to clear out the passage from the flush screw to where ever the outlet is?
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I don't really know. My thought is, I'd do what you did - and I would also maybe flush it with a hose - and maybe even flush it with a hose while running it in the barrel. Sounds like it's just compacted sand and maybe other gunk - I'm thinking nothing that would haunt you if you back flushed it through the water passages - that's where it came through to get imbedded there anyway.<br /><br />By the way, changing the water pump impeller is not a huge task. I used a Seloc shop manual and had no real problem - there was a little fiddling getting the key in place between the impeller and the drive shaft, but that was the only issue of consequence, assuming the lower unit drops off OK. This is something you should do as a matter of course if you don't really know when its been done or are unceratin if it's in good shape. It needs to be functional for the tell tale to work (again, assuming your engine has one).<br /><br />Do you have any digital pics of the engine you could post?
 
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deagle

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Re: 1966 merc 110 (9.8 HP) cooling water questions

you are picking at the water pump with the wire, you should drop the lower unit check the impeller and take apart the housing kit. get all the sand out. there should be a metal rod near the gear shift shaft that you can directly stick a hose on it and run some water with out the engine running to see if it comes out.
 
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valcour

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Re: 1966 merc 110 (9.8 HP) cooling water questions

D,<br />I thought you said you had a '67 so I figured it might be about the same as the '66 I have. Here are some pics of the motor if I have uploaded them correctly. The only place I can see that would be for the "tell-tale" water is the center square hole on the second picture, right on the centerline. There are no hole from the inside to the outside or any water hoses on this motor.<br /><br /> http://in.pg.photos.yahoo.com/ph/islevalcour/detail?.dir=a1f7&.dnm=12cb.jpg&.src=ph <br /><br /> http://in.pg.photos.yahoo.com/ph/islevalcour/detail?.dir=a1f7&.dnm=588a.jpg&.src=ph[/IMG]
 
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dajohnson53

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Re: 1966 merc 110 (9.8 HP) cooling water questions

Only the first linked set of photos works. The second link gives me a "not available" message.<br /><br />Sorry Valcour - actually, the older merc I am familiar with is a '66 (Serial number 1981539). I don't haev it any more, but I'm pretty sure it looks a lot like the motor in your pictures. I am sure about the S/N of that motor, but I'm not 100% sure it looks exactly the same as yours. Having this discussion with you, I'm wondering if it's just not the same motor. What's your S/N?<br /><br />I might have been not accurate or unclear about where it exits the engine. On my engine (the '66 and the '74), the telltale outlet was on the right (starboard) side above the slotted flush screw that is shown in your second photo. It comes right out of the bottom of the lower cowling. <br /><br />On the second photo in your first link, it would come out of the horizontal little niche of the bottom of the cowling above the "H.P" lettering, spraying downward. Its a very small hole. <br /><br />It is definitely not the rectangular holes along the centerline of the rear surface of the leg.<br /><br />It would stream when I was running the motor in the water (in the lake or in a barrel - I never used "muffs" or such - I couldn't make them work). It would also stream when I ran a garden hose into the flush port through an adapater.<br /><br />I guess I'm stumped - but very curious because I gotta believe, if your engine is a '66, it has a tell tale. Like I said, it sure looks similar to the '66 I had.<br /><br />Could you try to post some photos of the right/starboard side of the engine with the cover off.<br /><br />By the way, I was just looking at both my Seloc and OEM service manuals for this engine. In case it's a factor for you, I found the Seloc manual to be very adequate for the few things I've done to the old '66 110 and the '74 I currently have: water pump impeller replacement, carb rebuild, ignition coil replacement.
 
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valcour

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Re: 1966 merc 110 (9.8 HP) cooling water questions

Thanks D,<br />When I was taking some more pics for you I think I found the telltale hole you were talking about. It shows best on the last picture attached just fwd of the flush hole. I removed the small cowling that says "9.8 hp twin", but there are no hoses - but I can see the passage built into the metal housing going up to the powerhead. I'll try cleaning this with a wire and running it again. Thanks again for your help <br /><br /> http://in.pg.photos.yahoo.com/ph/islevalcour/album?.dir=a1f7
 
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valcour

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Re: 1966 merc 110 (9.8 HP) cooling water questions

I cleaned it out with a piece of wire and now it "pees" fine.<br /><br />I was unable to clear the flush hole with a wire. I am considering running in a bucket with a muritac acid solution (I have used this to clean the deposits from the raw water side of an atomic 4 engine sucessfully) and wonder if anyone has any experiance (or warnings) concerning doing this on a small outboard?
 
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dajohnson53

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Re: 1966 merc 110 (9.8 HP) cooling water questions

Valcour - I'm glad you got that telltale working. I was worried about my own intelligence and sanity (trying to remember exactly how that '66 was since I haven't seen it in a while!).<br /><br />Good luck with the flush hole. I can't be of help there other than speculating, which might be dangerous.
 
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