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Old 03-31-2011, 02:36 PM
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Default Water leaking out of Spark Plugs

Alright guys, as on my previous post I have a late 1980s 115hp inline tall 6 cylinder Mariner outboard. We recently dropped the lower unit, and installed a new water pump. When testing the engine out, it starts just fine and idles ok, but I noticed water slowly dripping out between the spark plug threads, more so on the number 3 cylinder. We let the engine idle for awhile and increased throttle without problems. Is this a major problem? I'm sure the engine over heated on the last outing when the water pump unnoticeable stopped working.

Thanks,
Mike
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Old 03-31-2011, 02:39 PM
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Yes, you have a head gasket/water jacket leak. Water + spark plugs = problem.
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Old 03-31-2011, 02:42 PM
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It is certainly a problem. First, if the spark plugs are installed correctly, water could not leak out. The gasket and threads hold the pressure of the combustion chamber. Second, you shouldn't have water there anyway.
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Old 03-31-2011, 03:01 PM
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Alright being a big novice here, can anyone tell me what my options are and how much this may cost. Can it be done by myself? What If I just run the engine as is?
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Old 03-31-2011, 03:17 PM
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http://www.boats.net/parts/search/Me...122/parts.html

This is the engine.
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Old 03-31-2011, 03:18 PM
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Quote:
Originally Posted by Mikegb88 View Post
Alright being a big novice here, can anyone tell me what my options are and how much this may cost. Can it be done by myself? What If I just run the engine as is?
Then it will blow up. Are you sure it's water? Head gaskets should not be too hard to change.

Sorry, it might not blow up but it will have a failure and it won't be a good one.
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Old 03-31-2011, 03:27 PM
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As usual a bunch of bad advice from all the self proclaimed professionals here. The inline 6 engines from Merc do not have head gaskets. There is a water jacket on the back of the engine, the gasket is leaking. It's a common problem and usually shows up after replacing the impeller. You'll have to remove the jacket, be careful some bolts will want to break. Check it with a something flat to make sure it isn't warped. Then just replace the gasket. You might have to pull the powerhead to remove the bottom bolts. The water is not in the cylinders and not leaking past the plug threads.
Also the engine will not blow up but you are spraying water all over the back of the motor, not a good thing.
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Old 03-31-2011, 03:39 PM
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As usual a bunch of bad advice from all the self proclaimed professionals here. The inline 6 engines from Merc do not have head gaskets. There is a water jacket on the back of the engine, the gasket is leaking. It's a common problem and usually shows up after replacing the impeller. You'll have to remove the jacket, be careful some bolts will want to break. Check it with a something flat to make sure it isn't warped. Then just replace the gasket. You might have to pull the powerhead to remove the bottom bolts. The water is not in the cylinders and not leaking past the plug threads.
Also the engine will not blow up but you are spraying water all over the back of the motor, not a good thing.
You got a love it when it's not a shot from the hip...... I didn't know that that outboard didn't have a head gasket but I try not to post on subjects that I'm not sure of or at least, I try not to claim that I'm knowledgeable when I'm not. All the previous comments were trying to be helpful.
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Old 03-31-2011, 03:42 PM
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gotta love that !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
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Old 03-31-2011, 04:26 PM
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Alright I think i'm feeling a little better! I'm having trouble finding the part on here http://www.boats.net/parts/search/Me...122/parts.html

The gasket for the water jacket.. I would like to see a picture of the water jacket too so i know what im looking at. Any help would be appreciated. Thanks again guys for all the responses.
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Old 03-31-2011, 04:35 PM
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Quote:
Originally Posted by sjef View Post
As usual a bunch of bad advice from all the self proclaimed professionals here. The inline 6 engines from Merc do not have head gaskets. There is a water jacket on the back of the engine, the gasket is leaking. It's a common problem and usually shows up after replacing the impeller. You'll have to remove the jacket, be careful some bolts will want to break. Check it with a something flat to make sure it isn't warped. Then just replace the gasket. You might have to pull the powerhead to remove the bottom bolts. The water is not in the cylinders and not leaking past the plug threads.
Also the engine will not blow up but you are spraying water all over the back of the motor, not a good thing.
Ding! 100% Correct.

Flashbacks to a mis-spent youth. The only thing I would add is that they are famous for breaking off bolts, so you might as well pull the powerhead to start with. It will make doing the repair easier in the long run. Overall not a hard repair. Good luck!
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Old 03-31-2011, 04:37 PM
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Think i found it http://www.boats.net/parts/search/Me...ERS/parts.html

Maybe part number 14?
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Old 03-31-2011, 04:41 PM
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Here you go, you need item number 24 - Gasket, cylinder cover

http://www.boats.net/parts/search/Me...ERS/parts.html
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Old 03-31-2011, 04:50 PM
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Alright awesome, that was my next guess! Yes that part looks very familiar and is right were it is leaking. Looks like I can just pop off the cylinder block cover and insert the new gasket.
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Old 03-31-2011, 05:02 PM
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whew.. glad I put "head gasket/water jacket."
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Old 03-31-2011, 05:23 PM
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From the original post: ".......... but I noticed water slowly dripping out between the spark plug threads,".

Well that's what I based my answer on. I wouldn't call myself a mechanic, but I do know water cannot drip out between the spark plug threads on a gasoline engine if the spark plugs are installed correctly.

I try to help, but nobody can expect a correct answer if they don't describe the symptoms accurately.
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Old 03-31-2011, 05:30 PM
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replace cylinder cover gasket
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Old 03-31-2011, 05:30 PM
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Quote:
Originally Posted by sjef View Post
As usual a bunch of bad advice from all the self proclaimed professionals here. The inline 6 engines from Merc do not have head gaskets. There is a water jacket on the back of the engine, the gasket is leaking. It's a common problem and usually shows up after replacing the impeller. You'll have to remove the jacket, be careful some bolts will want to break. Check it with a something flat to make sure it isn't warped. Then just replace the gasket. You might have to pull the powerhead to remove the bottom bolts. The water is not in the cylinders and not leaking past the plug threads.
Also the engine will not blow up but you are spraying water all over the back of the motor, not a good thing.
some of these guys are incurable. thanks for a good laugh.
i still have a set of ring compressors for those engines
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Old 03-31-2011, 05:32 PM
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Hey! I am an expert on such things. It's not water. The engine has been running on beer, not gas, and now it has to pee, of course.
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Old 03-31-2011, 05:40 PM
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Quote:
Originally Posted by Mikegb88 View Post
Alright awesome, that was my next guess! Yes that part looks very familiar and is right were it is leaking. Looks like I can just pop off the cylinder block cover and insert the new gasket.
like sjef said be very careful with the screws on the cover. some of them tend to be corroded in. if you snap one off they are a bitch to drill out. luckly they make heli coil thread repair.
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