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What goes here? Iron duke 4cyl merc

Old 06-02-2021, 07:05 AM
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Default What goes here? Iron duke 4cyl merc

Over the winter my buddy got a great deal on a little1987 bowrider with a 130hp iron duke 4cyl and an alpha. When he starts it up on the muffs water comes out of this spot above the starter on the starboard side of the engine. Anyone know what is supposed to go there? Of can you point out an online site to get an exploded view? thanks!


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Old 06-02-2021, 07:28 AM
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I do not but great parts online site and site sponsor:
https://www.mercruiserparts.com/
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Old 06-02-2021, 07:31 AM
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SB beat me to the post..

Last edited by speicher lane; 06-02-2021 at 07:35 AM.
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Old 06-02-2021, 07:35 AM
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Hey Doug,

You might find it here. Looks like there is only one drain plug on those blocks. Maybe part # 5 on the diagram.

https://www.mercruiserparts.com/bam/...30879/1559/100

This diagram also shows a couple of braces to the starter motor. Thread sizes of the bolts are shown so that might help

https://www.mercruiserparts.com/bam/.../30879/1559/10


Last edited by Sutphil; 06-02-2021 at 07:43 AM.
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Old 06-02-2021, 08:16 AM
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Looks like dipstick hole and starter brace hole. If water is coming out the smooth hole, I would be concerned.
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Old 06-02-2021, 08:37 AM
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Does look like one but in last pic the guys thumb seems to be around the dipstick tube. Hmm....
(Edit in: his thumb is around the fuel line, not the dipstick)

. There is a boat up the street with one of these but in shrink wrap and people are never around (all out of state 2nd home area) and I donít know them. Feels like a tease now cause that could help to answer this.

Last edited by SB; 06-02-2021 at 02:38 PM.
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Old 06-02-2021, 08:43 AM
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Originally Posted by Sutphil View Post
Hey Doug,

You might find it here. Looks like there is only one drain plug on those blocks. Maybe part # 5 on the diagram.

https://www.mercruiserparts.com/bam/...30879/1559/100
By the diagram, #5 looked possible, but I looked up the part and itís a threaded pipe plug.
https://www.mercruiserparts.com/36382-plug

Mercury-Mercruiser 22-36382 FITTING (.250-18 x .62)






Last edited by SB; 06-02-2021 at 08:46 AM.
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Old 06-02-2021, 08:44 AM
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Sure looks like a dipstick tube boss. Run a piece of mechanics wire in and see if you can tell where or which direction it goes.
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Old 06-02-2021, 09:59 AM
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Agreed the dipstick is clearly visible in the photo, but who knows what combination of generations of parts are in there.
Doug, surly you have a bore-scope that would go in there
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Old 06-02-2021, 12:16 PM
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If it is a dipstick boss, It would be using the old pressed in style that doesn't suck from the btm of the pan like the ol' 188 straight 6 (see link below)... which brings up the question, how much h2o is in the pan?

Was the engine rebuilt out of pieces - ie, new style pan vs original....still doesn't account for the water flow as that boss should have been solid

https://www.ebay.ca/itm/184657441866...NgItT-&vxp=mtr
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