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Old 23-10-2021, 17:36   #1
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What is this?

What is it and where did it come from? I found this bolt underneath my Yanmar model 3GM30F diesel engine. Cannot find a missing hole to put back into.

Thoughts?
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Old 23-10-2021, 17:45   #2
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Re: What is this?

Maybe a sacrificial anode? Could be a spare. Look at the exchanger, you may see a similar one.
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Old 23-10-2021, 18:13   #3
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Re: What is this?

Oddly it just showed up out of the blue on the diaper underneath the engine. So maybe it had been resting on something before. But also I cleaned it up to see the metal type and it appears to me that is brass. Can a sacrificial anode be brass?
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Old 23-10-2021, 18:14   #4
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Re: What is this?

Oil pan drain plug? Is the tip magnetic? That's common with oil pan drain plugs to attract any metal particles that may be swimming around in the oil.
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Old 23-10-2021, 18:42   #5
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Re: What is this?

I checked and has no magnetism. It appears to be brass.
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Old 23-10-2021, 19:16   #6
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Re: What is this?

3GM30F engines have no cooling system anodes. The tip seems to be designed to seal like used on a bleed screw. Trying to remember what the bleed screw on the lift pump looks like but the memory escapes.
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Old 23-10-2021, 19:22   #7
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Re: What is this?

Looks like some sort of detent pin or locator pin......maybe from the transmission shift mechanism or the governor?

Cooling system drain plug....?
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Old 23-10-2021, 19:24   #8
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Re: What is this?

Do you have the owners maintenance manual? Bet it’s in one of the schematic diagrams.
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Old 23-10-2021, 19:36   #9
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Re: What is this?

I have an operations manual but don't see any fine detail schematics.
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Old 23-10-2021, 19:38   #10
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Re: What is this?

It wasn't located near the transmission, but I'll double check.
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Old 23-10-2021, 19:40   #11
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Re: What is this?

The tip is perfectly flat and does have an indent line down the taper. So it does seem like it is used to seal something off.
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Old 23-10-2021, 20:08   #12
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Re: What is this?

Quote:
Originally Posted by Tigue View Post
I have an operations manual but don't see any fine detail schematics.
https://www.jeanneau-owners.com/Manu...e%20Manual.pdf

This is the service manual.
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Old 23-10-2021, 22:39   #13
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Re: What is this?

Quote:
Originally Posted by DougR View Post
Looks like some sort of detent pin or locator pin......maybe from the transmission shift mechanism or the governor?

Cooling system drain plug....?
Yep, it's a bleed screw/drain plug for the cooling system...
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Old 23-10-2021, 22:46   #14
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Re: What is this?

Do you have a heat exchange hot water system?
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Old 24-10-2021, 06:29   #15
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Re: What is this?

Quote:
Originally Posted by jimbunyard View Post
Yep, it's a bleed screw/drain plug for the cooling system...
On second thought, if it’s a cooling system drain, why isn’t there coolant all over the place?
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