Mercruiser 4.3 tks leaking water

[kjp17]

Water is leaking on my 2010 mercruiser 4.3 tks into the bilge from the left side above the bottom drain plug. Thats the best i can narrow it down. Any suggestions?

 

[dubs283]

Re: Mercruiser 4.3 tks leaking water

was the engine winterized??

 

[not enuf toys]

Re: Mercruiser 4.3 tks leaking water

2010 boat? does it have the original bellows on it?

 

[kjp17]

Re: Mercruiser 4.3 tks leaking water

was the engine winterized??

no, but i did drain the motor before winter

 

[kjp17]

Re: Mercruiser 4.3 tks leaking water

yes

 

[dubs283]

Re: Mercruiser 4.3 tks leaking water

no, but i did drain the motor before winter

okay, is water leaking from the engine near the engine drain plug?? while it is running??

or is it leaking from the transom assy area near the hull drain plug while in the water??

can you post a pic of the leak??

 

[kjp17]

Re: Mercruiser 4.3 tks leaking water

no, but i did drain the motor before winter

and there is not any water in the oil, nor has the any oil leaked out

 

[kjp17]

Re: Mercruiser 4.3 tks leaking water

okay, is water leaking from the engine near the engine drain plug?? while it is running??

or is it leaking from the transom assy area near the hull drain plug while in the water??

can you post a pic of the leak??

i cant get a camera up in there to take a picture, it is leaking right above the drain plug, it is in driveway with ears on it

 

[dubs283]

Re: Mercruiser 4.3 tks leaking water

it is leaking right above the drain plug, it is in driveway with ears on it

leaking above the engine drain plug while running??

if so - cracked block or pushed out casting plug, cause = not winterized

use a mirror and flashlite to investigate the source of the leak

when you drianed the block did you poke a wire in the drain hole to clear debris??

 

[kjp17]

Re: Mercruiser 4.3 tks leaking water

leaking above the engine drain plug while running??

if so - cracked block or pushed out casting plug, cause = not winterized

use a mirror and flashlite to investigate the source of the leak

when you drianed the block did you poke a wire in the drain hole to clear debris??

pic needs to go 180d right

 

[dubs283]

Re: Mercruiser 4.3 tks leaking water

im guessing the pic is upside down, if so it looks like the casting plug behing the motor mount popped out

you'll need to remove the mount to replace the plug, then run the engine to temp for 10 mins, let the motor cool/heat soak and run again and check for water in the oil

 

[kjp17]

Re: Mercruiser 4.3 tks leaking water

im guessing the pic is upside down, if so it looks like the casting plug behing the motor mount popped out

you'll need to remove the mount to replace the plug, then run the engine to temp for 10 mins, let the motor cool/heat soak and run again and check for water in the oil

think i just found it. Is it a metal cap looking plug?

 

[dubs283]

Re: Mercruiser 4.3 tks leaking water

Is it a metal cap looking plug?

yes, about 1 5/8" in diameter, made of brass

 

[sheehyma]

[No message]

 

[Rick Stephens]

Man are you lucky. Go buy a lottery ticket immediately.

 

[gergAlicious]

Going through mine now. Engine on stand.

Here is the port side of the block. The left core plug is the one behind the motor mount. You can see the three threaded bosses the mount attaches too:

Here is the starboard side:

This is a 2004 engine. The small boss, down low between the core plug locations is where the block drains were screwed in. Actually to the rear on the port side.

And . . . I see it was an original post from 2014 . . . .