water in the spark plugs

[swa737]

Re: water in the spark plugs

It does diesel often but can't remember if it did that time or not.

 

[Don S]

Re: water in the spark plugs

You really need to cure your dieseling problem.

Here are a couple of Merc service bulletins on the subject of water and dieseling.

http://www-alt.mercurymarine.com/mnetdata/Service/Cruiser/Bullet/01/mcsb01_13.pdf

http://www-alt.mercurymarine.com/mnetdata/Service/Cruiser/Bullet/97/Sb97_17.pdf

 

[swa737]

Re: water in the spark plugs

You guys are so full off ............. useful information. Checked the flappers, both sides are rotted out, you guys are good. I've never had theese go bad on my car before, boat maintenance is a whole new animal to me. I bought the boat two years ago, it had sat unused for quite awhile, could this cause flapper rottage(170 hours seems like it should be nuttin for a Mercruiser). The inside walls of the manifold and risers look really good, is it common for the flappers to go bad and have very minimal rust elsewhere? Is this an item that should be checked or changed routinely? Thanks for all the help!

 

[flabum]

Re: water in the spark plugs

The dieseling is probably the main problem. When an engine diesels, it will run backwards a few reolutions just before it quits, this will suck water in past your rotted flappers (not your wife's LOL)

 

[Don S]

Re: water in the spark plugs

Checked the flappers, both sides are rotted out, you guys are good. I've never had theese go bad on my car before,

That is because cars don't have 'em.

I bought the boat two years ago, it had sat unused for quite awhile, could this cause flapper rottage(170 hours seems like it should be nuttin for a Mercruiser)

They don't "Rot" the get destroyed from overheating when people don't replace the raw water pump impeller or the manifolds get plugged up, or run it out of the water without muffs and destroy both the raw water pump and the exhaust flappers and probably the hoses between the Y and the risers.

 

[swa737]

Re: water in the spark plugs

I really didn't mean that they rotted, like they were made out of apple cores or wood, I gues I meant deteriorated. One flapper was completely missing and the other was half missing, do they normally migrate all the way out of the pipes and outdrive or do I need to retrieve them?

 

[Don S]

Re: water in the spark plugs

Sometimes they get hung up in the drive or the bellhousing. Here is a picture bondo posted.
The deteriation is from heat as I mentioned earlier.

 

[swa737]

Re: water in the spark plugs

Are you supposed to use any type of sealant on the manifold or riser gaskets? I really need to buy some repair manuals, is there a certain brand you reccomend or encourage people to stay away from?

 

[Don S]

Re: water in the spark plugs

If you are using Mercruiser OEM gaskets, no sealant.
The ONLY manuals worth getting are the OEM.
At the link below, you can download the manuals for free.
http://www-alt.mercurymarine.com/mnetdata/sisdata/srvcovr.pdf

 

[flabum]

Re: water in the spark plugs

The flapper that Don posted can also caues the engine to fill with water.