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Old 03-13-2020, 11:43 AM   #1
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American Marine 6404DF Engines

I was wondering if anyone has experience with locating parts for these babies.
My Engine speed drive sensor is acting up and Iím trying to find a replacement.
Ive checked with all the JD Dealers in my area with no luck, mainly because though they are John Deere engines they are actually converted Tractor Engines through American Marine, which John Deere doesnít really support parts for. One of my engines has a newer pick up with a sticker on the top that reads 995/J
0904 if that means anything to anyone out there. It means nothing to John Deere Parts guys. These power plants are Awesome, smooth as silk and quiet.
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Old 03-13-2020, 12:02 PM   #2
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How about checking with tractor dealers. I can't believe that tractor owners were left out in the cold by JD parts, but maybe there is no speed (rpm?) indicator on a tractor.

David
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Old 03-13-2020, 12:51 PM   #3
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If your tachometer sensor looks like these ones they are made by the tachometer manufacturer not the engine maker. Check who made the tachometer and find a dealer for the tach.Click image for larger version

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Old 03-14-2020, 08:37 AM   #4
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I have put in three pictures two are of the sender that has been replaced and the third is the older one that is faulty.
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Old 03-14-2020, 10:12 AM   #5
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You can try Northern Lights. They marinized the same engine. They probably have something on the shelf that does the same job.
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Old 03-14-2020, 10:19 AM   #6
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Quote:
Originally Posted by David Burgess View Post
I have put in three pictures two are of the sender that has been replaced and the third is the older one that is faulty.

The sender that was replaced looks like a Stewart Warner. Any auto parts store should be able to get you one.

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Old 03-14-2020, 12:50 PM   #7
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Quote:
Originally Posted by tiltrider1 View Post
You can try Northern Lights. They marinized the same engine. They probably have something on the shelf that does the same job.
Thanks Ill give that a try.
Dave B.
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Old 03-14-2020, 01:21 PM   #8
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Make sure it is not your tach acting up. Tach senders on engines are pretty dang reliable, tachs not so much. Sender is just a rotating magnet and a coil. Check that drive pin is intact.

Hook up the sender acting goofy to the tach on the other engine and see if it reads right. Or vice-versa.

Technically I think they are called tachometer generator. Lots of mfr's and any should work if they fit. Might be variation in pole count, so be aware of that.
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