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Engine Gunk


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So I winterized my boat a month ago or so but recently started thinking about how much water came out (or didn't come out) when I pulled the knock sensors/lower drain plugs. Then I thought, well maybe some scale or debris is clogging them so yesterday I went out to probe around in there to see if more water would come out. I used a small allen wrench and immediately felt sludge, but the hole wasn't clogged. It appears this black sandy sludge is just sitting on the bottom.... I'm kinda at a loss for words on how to describe it but I was wondering if this was normal and do I need to flush it out?

enginegunk.jpg

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It's normal to an extent, I've flushed a few that have had excessive debris in them, just run the boat at idle with the drain plugs out and continually poke the hole to free up any clogs.

FWIW you should always free up the scale as you drain the motor.

-Chris

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It's normal to an extent, I've flushed a few that have had excessive debris in them, just run the boat at idle with the drain plugs out and continually poke the hole to free up any clogs.

FWIW you should always free up the scale as you drain the motor.

-Chris

But both of my drain plugs are knock sensors, so how do I do that?

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drain plug = knock sensors, take them out. You'll get plenty of flow out of the block to flush out the gunk.

You won't get an alarm at idle with no load, and even if you do just ignore it.

-Chris

Edited by 99response
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drain plug = knock sensors, take them out. You'll get plenty of flow out of the block to flush out the gunk.

You won't get an alarm at idle with no load, and even if you do just ignore it.

-Chris

Ok sounds easy enough, I"ll do that when I summerize, thanks Chris. So I don't understand why it's there though. Is there a significant rise to the exhaust manifold and not enough pressure to push it out? The previous owner beached the boat often and the boat probably idled for long periods of time in shallow sandy water. Could that have something to do with it?

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The previous owner beached the boat often and the boat probably idled for long periods of time in shallow sandy water. Could that have something to do with it?

That has EVERYTHING to do with it.

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That has EVERYTHING to do with it.

Plus1.gif I would get it flushed like Chris said in the spring. I'm surprised it's gooey like that though. Mine is very sandy/scale like. I guess it really would depend on what was on the bottom while the boat sat idling over top.

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Plus1.gif I would get it flushed like Chris said in the spring. I'm surprised it's gooey like that though. Mine is very sandy/scale like. I guess it really would depend on what was on the bottom while the boat sat idling over top.

i would not be surprised if gooey is the result of vegetation breaking down (think oil).

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