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Old 13-01-2007, 14:41   #1
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Rev counter

Has anybody fitted a rev counter to a 10hp Bukh diesel? My one is of 1985 vintage

Andy
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Old 13-01-2007, 21:56   #2
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There is a thread on this forum that discusses how you can hook a tachometer to your alternator. Do a search on tachometer and I think you'll find it. Some alternators have a tach connection on the back. Some don't. Mine doesn't. Don't know how I'll rig mine up.
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Old 13-01-2007, 23:41   #3
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Hi Andy, yes as John has just stated...alternator. You can use the alternator as one choice or you can fix a pickup on the flywheel or front pulley. Best thing would be to contact a Marine electrical guy and discuss options and costs of each. But it should be able to be done with out too much difficulty. Cost is another situation altogether.
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Old 14-01-2007, 01:24   #4
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Any alternator provides the ability for a simple revcounter installation. A wire can be soldered to the AC supply before the rectifier and this is the feed for the signal. Any automotive electrician can do this for you easily. VDO (and many other brands) provide off the shelf gauges for this type of installation and they can all be calibrated for different pulley sizes. The electrician will be able to calibrate it for you with a photo tach but make sure they do this at you normal operating revs as there is often a bit of inaccuracy at low revs. While you've got the alternator off, take advantage of the work & get it serviced.
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Old 19-01-2007, 17:39   #5
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I like these
Tiny-Tach: Diesel Tachometers
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Old 19-01-2007, 18:44   #6
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I hooked up a new tach to my Motorola alternator on my 1982 Volvo. Many alternators have this connection and it is easy to hook up. I used a Teleflex Morse unit calbrated up 3500 rpm for a diesel. It has a switch on the back with several differant settings depending on how many poles your alternator has and the pulley ratio.
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Old 19-01-2007, 19:13   #7
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Aloha Never Monday,
Can you tell us how the transducer is hooked up to read engine RPM? Thanks,
JohnL
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Old 19-01-2007, 19:16   #8
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John,
Here are the instalation directions
Tiny-Tach: Installation Instructions for Diesel Tach
It clamps to an injector line after the injector pump.
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Old 19-01-2007, 19:23   #9
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Thanks Pat,
Since my alternator doesn't have a lead for tach this might a much better solution for me. Of course I have lots of questions but the first would be does it measure 4 cylinder, 3 cylinder, 2 cylinder the same way?
Your experience with this product is good?
Kind Regards,
JohnL
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Old 19-01-2007, 19:27   #10
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It counts a single cylinder and the fuel pulse for that cylinder. It could be used on any number of cylinders. The fuel will only pulse once per rev for that cylinder. I've had good luck with them. They are small thou, so consider mounting it somewhere where you'll be able to see it.
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