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Old 13-10-2019, 20:04   #1
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3YM30 Tacho sender thread size?

I want to install a magnetic tachometer sender in the thread on the bell housing at the rear on the exhaust side of my 3YM30.

I don't want to use the tacho signal out of my Balmar Alternator/regulator combo as the signal disappears when batts are full.

Anyhoo, does anyone have data on the thread size? I have pulled the bolt and the thread looks to be 11/16 inch with my cheapo micrometer but I would expect the Japanese would have made it metric so I'm seeking confirmation.
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Old 13-10-2019, 23:44   #2
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Re: 3YM30 Tacho sender thread size?

The QM, GM and 4JH series use an M18x1.5 thread (metric fine).
The Yanmar part number is 128170-91160 (ex 124070 - 91160), the VDO number used to be 340.804/007/007.

I certain it will be the same for 3YM30.
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Old 14-10-2019, 03:47   #3
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Re: 3YM30 Tacho sender thread size?

I suspect Wotname is correct, as usual.

Page 9-41 of this “4JH Series” Manual indicates “M-18 x P1.5"
http://sagaforumet.com/yanmar-manual...kapittel_9.pdf

The 3YM30 Shop Manual doesn’t indicate an MPU thread size, but the oil & water senders use the M-18 x P1.5 thread.
https://j109.org/docs/yanmar_3ym-2ym-service-manual.pdf
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Old 14-10-2019, 14:46   #4
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Re: 3YM30 Tacho sender thread size?

Cheers guys. I've ordered an M18 x P1.5 and will report back when it arrives.
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Old 12-11-2019, 21:30   #5
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Re: 3YM30 Tacho sender thread size?

I can confirm M18 x p1.5 is the thread size.

I just need to sculpt the signal now to feed my tacho and it's all good.
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Old 12-11-2019, 22:57   #6
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Re: 3YM30 Tacho sender thread size?

^^
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Old 09-01-2020, 04:20   #7
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Re: 3YM30 Tacho sender thread size?

To save me physically (mis)counting the teeth, does anyone know how many teeth are on the 3YM30 flywheel?
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Old 02-02-2020, 06:41   #8
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Re: 3YM30 Tacho sender thread size?

I have determined that the flywheel on my 3YM30's has 97 teeth. This may be useful to others.

Now sucessfully running with a M18 thread magnetic pickup screwed into the bell housing, into an EMU-1 NMEA2K interface, and connected to a Faria 32803 magnetic-pickup type tacho. Digitally accurate NMEA2K tacho! Sweet.
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