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Old 31-05-2013, 13:46   #1
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Join Date: May 2013
Location: New England
Boat: Bristol 35.5
Posts: 2
Wanted: Yanmar 2QM20 Tachometer and Sender Unit (or replacements)

Hi,

I am trying to locate a tachometer and sender unit for my Yanmar 2QM20H.
I have been told they by Yanmar dealer that are no longer made. I would like to locate a replacement or equivalent units.

The service manual lists them with the following Yanmar part numbers:
Tachometer: 104571-91100
Sender Unit: 128170-91160

The same manual also lists them as VDO part numbers:
Tachometer: 430.230/019/001
Sender Unit: 340.804/007/007
VDO no longer lists these part numbers either.

From my research, I think I can use a number of aftermarket Tachs that will take output from magnetic sender units, but I ham having difficulty locating a sender unit.

It seems to have the specifications of:
Metric threads: M18 x 1.5
Number of ring gear teeth: 126
Module: 2.54
Tachometer frequency: 7350 Hz

Can anyone help me out or suggest how to find replacements?

There is also some mention of attaching Tach using the alternator, but that may require upgrading the alternator. Any thoughts on that would be welcome also.

Thanks.
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Old 08-08-2013, 14:26   #2
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Re: Wanted: Yanmar 2QM20 Tachometer and Sender Unit (or replacements)

If you don't mind changing the mounting holes, take a look at Design Technology, Inc., Home of the Tiny-Tach - Diesel Tiny-Tach Tachometer
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Old 20-07-2014, 16:44   #3
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Posts: 8
Re: Wanted: Yanmar 2QM20 Tachometer and Sender Unit (or replacements)

WILROG.
Did anybody get back to you on this?.............or have you solved it and got the parts already?

Cheers,....BERN
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