So I picked up an 8 HP Mercury serial 0c112684. I can't find what year it is so if anyone knows a good website that would be great. Anyways I tried to get it started in a bucket and it would idle for about a minute and then stop. It would barely get up to a high enough idle to start pushing water out of the pee hole. I noticed that when it started to die, if I pushed the primer bubble it would keep going for about another 30 seconds. Now I am guessing it is either a fuel pump (if they have one, I am new to this) or I did rig the fuel line. They didn't have a mercury one, so I picked up a Johnson one and cut the end by the motor and put a mercury end on it. Could this be causing the lack of fuel. Any ideas would be great. Thanks.
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- Thread starter popoeye
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200racing
Well-known member
https://www.maxrules.com/models/Merc_model_files/7p5-9p9.html
it says you have 1989 oil injected,rope start,long shaft.
it says you have 1989 oil injected,rope start,long shaft.
Awesome, Thank you very much. What does the oil injected mean? I am guessing it means there is a spot to put the oil seperate. I didn't see it. Any idea where it might be. This might be why it wasn't running either cause I was running pre mixed. Also looking at that chart to attached I didn't see where it stated that it was oil injected. I was wondering if you could help me see this. Thanks a bunch again.
200racing
Well-known member
you never know PO might have taken it off or the site could be wrong.a manual would probably help you out.
I am not sure. I have never seen an oil injected so I am not sure what I am looking for. But I don't see anywhere on the engine that I could add oil. Does any one know if it is possible if the Johnson hookup on the gas tank could be effecting why it won't get going.
popoeye said:
Highly unlikely that the J/E converted hose is causing the issue. If pumping the bulb keeps it running, the fuel pump or fuel passage problem.
Did you pull the fuel bowl or determine if gas was left in that motor while it was sitting all those years?
huntinfool
Well-known member
Can you post a couple pics of it? If it is oil injected we should be able to help you find the oil tank and help you get it running.
huntinfool said:
It would be best to be 100% sure. While I didn't see any oil pumps, or even mixing lines, in the schematics, a picture would provide the final say for the merc expierenced.
If that 8hp had oil injection, it was discontinued by serial 0D281000. All models (6, 8, 9.9, 10, 15) covered by that merc service manual were premix.
I will post pics as soon as I can. I am having computer problems and am using a work computer right now. However I am pretty sure that it isn't an oil injected. I just got done take another good look and saw no oil reserve. However I am begging for the next piece of help. I want to start off by saying thank you so much for helping me with this learning process. I hope I can give back as much in the future. Well I got the engine running. However I had to push the throttle a little by hand. It ran great and everything looked good. How ever once I let go of the throttle on the carb it would die. So my uneducated guess is the carb needs to be adjusted. My question is where should I start to adjust the carb? I do have some experience with motorcycle 2 stroke carbs. I am just not sure about a outboard. Again everyone thanks for the help. I promise I will get this figured out soon. Look foward to hearing from you.
popoeye, why did you have to use your hand to control the throttle???? sounds to me like you have a issue with the linkage between the throttle handle and your carb, if thats not it i would just buy a carb. kit and rebuild it. they are not expensive and it should be pretty easy for you if you have played with 2 cycle motorcycle carbs. jmho......
popoeye, why did you have to use your hand to control the throttle???? sounds to me like you have a issue with the linkage between the throttle handle and your carb, if thats not it i would just buy a carb. kit and rebuild it. they are not expensive and it should be pretty easy for you if you have played with 2 cycle motorcycle carbs. jmho......
No the linkage is fine. I checked that. I didn't have to use my hand to control the throttle. I just used the throttle on the carb to give it a little more gas when it was neutral because it wouldn't idle or start. But just a little movement on the throttle it started right up and idled fine. Do you still think I need to rebuild that carb or does that sound like more of a adjustment. Thanks for the advice.
There will be an idle speed adjustment, and probably an idle mixture adjustment. You will have to see your manual to find the required rpm and procedure. It probably calls for in water and in gear. Do you have a tach?
The manual will also have a procedure for the idle mixture. Usually it is repetitive, idle mixture, idle speed, idle mixture... for a few cycles.
If there is crap in the carb, the readings may be inconsistant, fluctuate, or mask issues.
Turning the idle speed up to keep it running is ok for testing. Just don't shift it into gear.
Given the long storage the motor had, its time to bite the bullit and order a carb kit and fuel pump diaphram kit, along with a new water impeller. 99% of the carb rebuild is a very thourouh cleaning. You could brief yourself on the procedures in the link I sent you, but wait for your specific SM before performing.
Other things you could do, while waiting for parts to arrive, and become good practice for seasonal maintenance:
- Drain and replace lower unit oil
- Do a compression Test
- Decarbonize (I use seafoam spray)
- New plugs gapped and installed (after decarb)
The manual will also have a procedure for the idle mixture. Usually it is repetitive, idle mixture, idle speed, idle mixture... for a few cycles.
If there is crap in the carb, the readings may be inconsistant, fluctuate, or mask issues.
Turning the idle speed up to keep it running is ok for testing. Just don't shift it into gear.
Given the long storage the motor had, its time to bite the bullit and order a carb kit and fuel pump diaphram kit, along with a new water impeller. 99% of the carb rebuild is a very thourouh cleaning. You could brief yourself on the procedures in the link I sent you, but wait for your specific SM before performing.
Other things you could do, while waiting for parts to arrive, and become good practice for seasonal maintenance:
- Drain and replace lower unit oil
- Do a compression Test
- Decarbonize (I use seafoam spray)
- New plugs gapped and installed (after decarb)
