For purposes of discussion, 1986 54 MY with 8v92TA's. Assume I am an idiot and mechanically unskilled.
Port tachs stopped working at both helm stations. Glendenning quit engaging at same time. I am guessing failure at sender.
Where is the sender and what should I look for?
What type of tech do I call to fix? Detroit Diesel? Glenndenning? Other? Boat is in Tampa.
Would installing Flo Scans, digital tachs, or an upgrade by necessity fix the problem?
What is the estimated purchase and install cost for this route?
Thank you for your thoughts and assistance.
Bruce
Freestyle
1986 62 CPMY (54MY with ext. cockpit)
Tampa
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Thread: Tach - Glendenning
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08-17-2019 12:02 PM #1Senior Member
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Tach - Glendenning
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08-17-2019 06:21 PM #2
Re: Tach - Glendenning
I would call Glendenning. They are very helpful and got mine going right off the bat. Sounds like you are on the right track for a sensor based on this link.
https://www.glendinningprods.com/wp-...?4cf23d&4cf23d
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Re: Tach - Glendenning
Not a great picture, but here's your sender.
IMG_8830.jpg
There are, as I recall, two very small gauge leads attached. They are delicate. May be a good starting point.Semper Siesta
Robert Clarkson
ASLAN, 1983 55C #343
Charleston, SC
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08-18-2019 12:22 AM #4Senior Member
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Re: Tach - Glendenning
I thought glendenning uses mechanical drive cables between the engines and the unit. Senders would be far too inaccurate to get an exact match of RPM. A single problem may still be causing both symptoms, but it wouldn't be the sender.
Prometheus
1978 53' MY Hull #529
Viera, FL
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08-19-2019 04:21 PM #6Senior Member
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- Jun 2018
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Re: Tach - Glendenning
My boat had 1292s but it had a mechanical drive cable between the engine and the glendinning. The tach sender was on the glendinning. I had the same problem. It was the drive cable and 90 deg. adapter on the engine. Lauderdale Speedometer made me a new cable and adapter while I waited. Problem fixed.
Thanks,
Tony
2008 Cheoy Lee Bravo 78 "Bella Sophia"
1989 78' Hatteras CPMY #311 "Bella Sophia" (sold)
2007 Everglades 290cc “Bada Bing” (sold)
2006 Advanced Outdoors 28cc (sold)
2003 Melges 24 "Bada Bing" (sold)
2023 HCB 42 “Bada Bing”
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Re: Tach - Glendenning
The tachometers and glendenning synchronizer are driven by a small pigtail coming off the back of your blower drive. The square drive from the blower drive shaft enters a tachometer pickup, and glendenning pickup. Hopefully, it's a problem in the pickup unit. The drive pigtail can breakdown, and that's a serious issue because it can put metal into the engine. On my engine, it's on the port engine. Easy fix. 2 nuts hold on the pickup unit, and the blower shaft is retained by a c clip, and just slides out. The Glendenning folks have repair parts, but you'll need to know your rotation ratio.
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08-19-2019 10:18 PM #10Senior Member
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- May 2010
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Re: Tach - Glendenning
My tach generator is fitted on a small 90 degree gear box installed on the back of the transmission pump. a cable drive then delivers rpm to the glendenning synchronizer. The tack generator can also be put on the other end of the cable going into the synchronizer. Two wires send impulse signal to tach gage.
Pete