1994 10hp issues Newbie to Honda

[brownhunter]

Last night I picked up this outboard for $500. A great deal! I looked it at it closer and started it up and found it does have a few issues that I discovered today.

This my 1st Honda so I am not to sure about a few things.

No water coming from here. I've fixed impllars before so itshouldnt be to hard right?

What is this?

How do I fix this?

 

[brownhunter]

Re: 1994 10hp issues Newbie to Honda

And this is for? If i were to make it a kicker(electric start?)?

 

[isaksp00]

Re: 1994 10hp issues Newbie to Honda

The plug is probably the output to charge a battery, if it is like my 8HP - plug looks identical. See if there's 12V on the two terminals when running. The thing you circled to the left of the Oil label is an oil pressure indicator - it should glow green when engine is running, if you have good oil pressure. If it isn't green I suppose it could be the alternator that provides power (a likely symptom if you don't have 12V on the plug output) or the oil pump or whatever senses the oil pressure. If no water comes from the telltale, could be the impeller or could simply be a blocked tube - shove a stiff plastic "wire" up the tube to see if blocked. Make sure that is the water pee hole, though - mine also has a tube from the carb out the bottom of the housing, so make sure that one has a hose connected up to the engine block itself.

 

[brownhunter]

Re: 1994 10hp issues Newbie to Honda

Thanks isakp00!! All these views on my post and your the only one who replied?!!?

Ok the yellow line shows the direction of the hose which starts on block lower side on the oopsite side of where it drains. I picked up an impeller, they told me with the serial # it is actually a 80s model and not a 90s. They also told me that if the motor goes bad, I got a gold mine if I sell out the parts to it, as Honda no longer makes parts for the older models. They also said since it still has a yellow prop it sounds like they people before I had it took good care of it. It pretty clean on the inside too! Should run forever as long as i keep tuning it up!

 

[brownhunter]

Re: 1994 10hp issues Newbie to Honda

Where can I look up the serial # to see what year it is?

 

[isaksp00]

Re: 1994 10hp issues Newbie to Honda

Honda's don't seem to be as popular as the Tohatsu families.

I am not near the motor now, but I think the ser num is on a plate on the front side of the engine somewhere, or engraved in it. There is a block ser num and an overall outboard ser number, I think.

I can't tell from your yellow lines exactly where that hose goes, but it is a bit different than the 8 anyway. My pee hole hose exits from the rear side of the block, on the left side, and the hole in the housing where the hose exist is also on the left. At any rate, I think there are only two hoses that allow for draining things through the housing, and one is from the carb overflow. The other would be the pee hole. Try pushing a plastic strip, like from a large size wire tie, or an aluminum solid core wire up there to clear it out. If your hose is long, see if you can remove it, try to clean it, and see fi water does come out the hole on the block.
Peter

 

[brownhunter]

Re: 1994 10hp issues Newbie to Honda

I always heard great things about Honda outboard which is why I bought one! I suprised to see that not many people have them. I tried to take off the impellar, which I thought would be easy like a Evinrude, but when I took off the lower unit, well I couldnt take it off, there was no screw clamps holding onto the gear rod.

Do I remove this pin in the picture and remove the whole gear rod to take the lower unit off?

 

[isaksp00]

Re: 1994 10hp issues Newbie to Honda

Pull out the cotter pin, then pull the clevis pin out of the assembly. This is tough, and I've never done it, but to remove the whole lower leg you unscrew that fitting at the top of the shift rod. To do that you have to remove the clamp assbly that is in the way, and with agility you can unscrew that fitting. You can then pull the leg off (after unbolting it at the bottom of course) and the whole shift rod comes out with it. Don't pull hard on the leg with that fitting still screwed to the top of the rod or it may pull the shifter wedge out of the entire gear unit.

What I did was to leave the fitting screwed to the top of the shift rod, but with the clevis pin removed. You can then pull the lower unit down maybe 6 to 8 inches or so before the fitting won't pass through the hole the rod goes through. While it doesn't allow you to remove the whole LU, it does lower it enough to easily disassemble the impeller housing. I mounted my engine on a board attached to a couple of heavy posts in the basement, and used a wood platform of the right height to support the LU while I was doing the water pump work.

When you push it back in, it is tough to get the drive shaft lined up with the crankshaft splined hole and also have the water pump impeller output tube line up with the tube that goes up to the block at the same time - you just have to sort of finesse it. Do put some grease on the splines of the driveshaft, but not at the top - that'd prevent it from seating. When you start the engine, DON'T forget to watch for water output, because if the impeller output is not lined up with the water tube, you'll burn up your block if you run it too long. I hadn't lined mine up, and forgot to initially check, but noticed it (luckily) before it heated up.

 

[Pontoon24]

Re: 1994 10hp issues Newbie to Honda

I hope you took an air hose and blew back through the pee hole before tearing the motor apart. I'm not sure the motor has serious issues, you may just need to get more familiar with it. Go to the honda site and download the owners manual after you find the serial number. Its on the motor somewhere, mine is on the shaft below where it clamps on to the transom.

 

[brownhunter]

Re: 1994 10hp issues Newbie to Honda

Oh man. Thats what I was affraid of! What a pain! I can do my Evinrude in 5mins! This does not sound easy! :-( Thanks a bunch for the input guys!!!

 

[brownhunter]

Re: 1994 10hp issues Newbie to Honda

What I did was to leave the fitting screwed to the top of the shift rod, but with the clevis pin removed. You can then pull the lower unit down maybe 6 to 8 inches or so before the fitting won't pass through the hole the rod goes through. While it doesn't allow you to remove the whole LU, it does lower it enough to easily disassemble the impeller housing. I mounted my engine on a board attached to a couple of heavy posts in the basement, and used a wood platform of the right height to support the LU while I was doing the water pump work.
.

What? how did you slide the new impeller down? sure you can take the housing unbloted but how do u remove old impeeler with out removing entire lowr unit?

 

[brownhunter]

Re: 1994 10hp issues Newbie to Honda

Well I looked up the serial # online. So the guy I bought it from said it was a 1994 10hp. Well I just looked up the serial #bf75s1704875 on the block. Its a 1985 7.5!!!??? I kinda doubt the guy knew, he seemed a bit ignorant about fishing and boating. But its still lame! Why would they make lids of 10hp that would fit the 7.5s?!?!! STUPID!!

 

[isaksp00]

Re: 1994 10hp issues Newbie to Honda

Assuming this 7.5 is similar to my circa 1992 8...

The shift shaft is longer than the drive shaft. So, when you pull the LU as far down as it can go while still leaving the fitting screwed to the top of the shift shaft, the top of the drive shaft is exposed. You can remove the bolts that attach the water pump housing, pull the housing cover off, and then pull the impeller off the shaft. I found that much easier than what it looked like I'd have to do to actually unscrew that fitting, which is a bear to get at.

The 10HP and 7.5 may differ only in the carb. If that's the case, then the block and housings would be the same, so maybe someone damaged the cowl with 7.5 decals and found one for the 10.

The mechanics experts recommended in many other posts to replace the water pump housing when you replace the impeller, as evidently it will last longer. I replaced my impeller when I bought the used boat, since I didn't know its history. I did not replace the metal housing cup, but I did clean it well and used a high speed rotary tool (like a Dremel) with a polishing cloth wheel and polishing compound to smooth the walls.

 

[Star]

Re: 1994 10hp issues Newbie to Honda

Dear Honda,
You paid Too much for this motor even if it was a 10hp. I hope it only ran in fresh water. I did not post this just to p.. you off, This should be a life lesson for all that read this. That 10 case didn't get there by accident!!!! Not all people are like this but the number of them is. If it were me I would take it back to him and jam his head into the 10hp cover. If you don't know what you are buying in any marine stuff you need to get an uncle or good knowlegable person to avoid fraud like this. This could be a good motor and I hope you resolve all of your problems.

 

[brownhunter]

Re: 1994 10hp issues Newbie to Honda

I researched the 7.5hp and 10hp. Good luck finding a 6hp or more 4 stroke for under 500 bucks. I've looked in 4 states online. Usually I see this 7.5 selling for 600 or more. The guy I bought it from said it came with the boat and he thought it was a 10hp. Trust me I am 90% sure this guy had no clue either. He was a bit ignorant to fishing and boating. It is a lesson learned that Honda lids can be switched! Still stupid. I couldn't do it with my 6hp Evinrude and 9.9 Evinrude. So if the carb is the only thing different, can I turn this 7.5 into a 10?

 

[brownhunter]

Re: 1994 10hp issues Newbie to Honda

So I got the lower untit off.

Found the impeller was bad.

view of lower unit.

New gasket and impeller, add dish soap to impeller to make it go back into housing a lil easier.

I put it all back together, thinking YES ALL DONE!!!. Well I started it up and STILL no water coming out! I blew with my mouth and took the shop vac to the tube and other areas after I took it apart again.

Here is a upward view of upper unit, where I circled I noticed the rubber lip is warpped that is just about where the housing tube slides up to. Idk if water could be leaking out and not going up to the motor? When the motor was running, nothing was coming out the side pee hole. but a little was squirting out of the exaust in the back of the motor, but only when it was not in gear.

What now? Is it the warpped rubber on the rube my reason?

 

[isaksp00]

Re: 1994 10hp issues Newbie to Honda

I am not sure what that white thing is coming out of the tube in the upper unit, I don't recall mine having that. The top outlet of the pump fits into the bottom of that water tube. The white thing almost looks like some kind of plug - is it a hollow tube? Make sure the pump's outlet really is fitted into the tube, or else you are just pumping water into the hollow leg - my first attempt to reinstall the LU missed, and I had no water in the engine.

 

[brownhunter]

Re: 1994 10hp issues Newbie to Honda

I am not sure what that white thing is coming out of the tube in the upper unit, I don't recall mine having that. The top outlet of the pump fits into the bottom of that water tube. The white thing almost looks like some kind of plug - is it a hollow tube? Make sure the pump's outlet really is fitted into the tube, or else you are just pumping water into the hollow leg - my first attempt to reinstall the LU missed, and I had no water in the engine.

The white thing is because I had to use the flash on the camera. It is the metal male tube part the fits into the female housing tube.

 

[brownhunter]

Re: 1994 10hp issues Newbie to Honda

Today I pulled this hose off and tried to blow thru it. Nothing. Grabbed some downrigger wire and tried to push it thru. There was a blockage. Found a cocoon from a bug and other junk. Hose all clear now. But where I circled on the block of the motor where the hose goes. It too seems to be blocked. Is this hose the peehole? Originally I thought the peehole was behind on the tiller handle side and come out with the exuast.

Which one is the pee hole? Left or Right?

 

[brownhunter]

Re: 1994 10hp issues Newbie to Honda

Well I unbolted it, removed metal plate. I found the pee hole was being blocked by yellowishgreen stuff with tiny fibers in it. Now I just need new gasket and I should be good to go!