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Old 01-06-2017, 09:47 AM   #1
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What Is It?

I found this lying in the bilge, halfway between the front of the engine and the bulkhead. It's about two inches long and broken off on the end away from the nut. The shaft is about 1/8" in diameter and the nut is probably 3/8". Or, it could be metric, I didn't check.

The boat is a trawler with a single Volvo TAMD 41P engine.
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Old 01-06-2017, 10:08 AM   #2
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99,9% certainty is not a part of Volvo Penta original. You need to try to look at possibly empty holes in the engine room equipment installations.


Unfortunately, I can not help you any more
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Old 01-06-2017, 10:45 AM   #3
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Do you have any kind of hatch pulls on the hatches to your engine space?
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Old 01-06-2017, 11:02 AM   #4
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I have those engines. I don't have any chrome plated or stainless crown nuts on my engines. Any Brass or bronze bolts are only in the Heat exchangers, maybe the aftercooler, but definitely not the block.
That doesn't mean this one wasn't added to yours by a PO, just reduces the likelihood that this part came from your engine.
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Old 01-06-2017, 11:07 AM   #5
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After leaving the boat, it occurred to me that this might have come from the alternator. I'll be prepared to do a lot of exploring the next time I go back.


I have hatch pulls but they are screwed, not bolted.
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Old 01-06-2017, 11:08 AM   #6
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It looks like a main bolt for a small electric motor, holding the end caps together to sandwich the motor housing. It would be an older unit as newer motors tend to have threads machined into one of the two end caps.
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Old 01-06-2017, 11:13 AM   #7
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Greetings,
Mr. WK. The fact that one end is terminated in a chromed acorn nut with a non metallic washer suggests that at one time it was meant to hold down a fitting/panel that did not need to be very tightly torqued down and was in a visible area.
The missing end could have been simply threaded or terminated in a "head" of some sort (flat head, round head, hex head). Very unlikely that it was part of your engine...MY best guess.

As far as being stainless. Just doesn't look like it to me (wrong color).
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Old 01-06-2017, 11:16 AM   #8
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Greetings,
Mr. WK. The fact that one end is terminated in a chromed acorn nut with a non metallic washer suggests that at one time it was meant to hold down a fitting/panel that did not need to be very tightly torqued down and was in a visible area.
The missing end could have been simply threaded or terminated in a "head" of some sort (flat head, round head, hex head). Very unlikely that it was part of your engine...MY best guess.
The valve covers on the engine have similar cap nuts but of course, being a Volvo, they are painted green. Also, none are missing.
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Old 01-06-2017, 11:18 AM   #9
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It looks like a main bolt for a small electric motor, holding the end caps together to sandwich the motor housing. It would be an older unit as newer motors tend to have threads machined into one of the two end caps.
I remember something similar on a macerator pump I once repaired. As I mentioned, I am hoping to find it's off the alternator which is pretty similar to a motor.

And of course, it's possible that it's been floating around for years and just now surfaced.
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Old 01-06-2017, 11:24 AM   #10
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The acorn nut means it belongs to something meant to look pretty. A faucet, an engine or generator control panel, a valve manifold mount.

Look around for other acorn nuts on stuff as they are usually not used in singles.
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Old 01-06-2017, 11:33 AM   #11
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1/8" dia brass bolt, soft washer, and 3/8" chromed acorn nut? I doubt it's anything serious. I doubt it's part of an electric motor or an alternator; not long enough and not usually acorn nuts. I agree the nut does not look like stainless. Not much corrosion so not from a wet item.

Guesses: off of a marine toilet; a cover for electric switch gear/charger/inverter; from some bit of discarded equipment; potable water filter;

I always wonder when I find washers, nuts, screws lying around.
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Old 01-06-2017, 11:50 AM   #12
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At first look I would agree that it is off something that wants to look tidy given the head of that nut.

But on second look it looks like the bolt of a strainer basket. These are usually held down by wing nuts, but if the OP had dropped or otherwise lost the wing nut, he could very well have reached into his pile of nuts and found something to replace it with.

Check your strainers.
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Old 01-06-2017, 12:12 PM   #13
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I just replaced several of these. They are Macerator pump bolts and are two different lengths. there is a stainless replacement bolt set available as the brass were problematical.
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Old 01-06-2017, 12:14 PM   #14
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NEW Jabsco SS Bolt Kit f/Older 18590 Series Macerator Pumps 17288-1000 | eBay
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Old 01-06-2017, 12:15 PM   #15
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Looks like a strainer or pump assembly stud. Looks like the head is broken and remains the nuts, did you find the hex head anywhere near?
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Old 01-06-2017, 12:23 PM   #16
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I just replaced several of these. They are Macerator pump bolts and are two different lengths. there is a stainless replacement bolt set available as the brass were problematical.
As I mentioned, that's what it looks like but there's no way any parts from the macerator found their way to where I found this part.

There was a comment about it being too short for something but since it's broken at the end opposite the nut, we don't know how long the rest of it is.

Thanks for all the suggestions. It's going to be really cold this weekend so I probably won't visit the boat until next weekend.
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Old 01-06-2017, 12:45 PM   #17
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It is something someone threw in there to drive you nuts. A little like throwing a rigging pin or cotter pin on a competitor's sail boat deck before a race.
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Old 01-06-2017, 01:07 PM   #18
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It's entirely due to bilge ferrets, they love to do this sort of thing to annoy you. You must learn to adapt and understand their games.
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Old 01-06-2017, 01:16 PM   #19
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Stupid question, do you have any prosthesis? Maybe this does not come from your boat...
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Old 01-06-2017, 02:42 PM   #20
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Greetings,
Mr. L_t. THAT'S the best question of the year (so far). You win the internet!

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