P79 Transducer question - R27

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P79 Transducer question - R27

Postby TugScout on Sat Jul 06, 2019 6:55 pm

Hi Gang,

For those of you with an intimate knowledge of the P79 transducer, could you please take a look at the photos in my album and tell me if it looks like the transducer is actually in the glycol cup or if it is just glued to the hull.

The cup in the P79 installation manual looks much larger and has a flange on the bottom, but I'm thinking it could be all buried in resin. I know there were reports of the transducers being glued directly to the hull so I was hoping someone here could tell from the pictures.

Now that I've located it, I'm going to need a 12-18" orthopedic extension to actually reach the dang thing.

Thanks,
Mark
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Re: P79 Transducer question - R27

Postby BB marine on Sat Jul 06, 2019 8:50 pm

Glued directly to the hull.
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Re: P79 Transducer question - R27

Postby bob daily on Sat Jul 06, 2019 11:45 pm

German makes a p79 without the cup that was used by fluid motions on a number of there models, on my R-21 2009 the p-79 was glued to the hull, this is the same transducer that is sold for elect. Trowling motors by Garmin. Your pictures look just like what I had prior to my replacement to a through hull . See my photo album for the upgrade. Bob
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Re: P79 Transducer question - R27

Postby knotflying on Sun Jul 07, 2019 7:37 am

Yep, glued down. I dread the day I have to fix mine. I am looking for a spot that will be easier access where I can install a new one when needed. The real estate seems scarce.
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Re: P79 Transducer question - R27

Postby TugScout on Sun Jul 07, 2019 9:09 am

Thanks everyone. I had thought it was likely glued down as well.

So has anyone found a better, more accessible location for a replacement?

Many thanks,
Mark


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Re: P79 Transducer question - R27

Postby Jeff58 on Fri Jul 12, 2019 5:23 am

I just repaired mine on a CW 28. iMarineUSA.com sells just the replacement cup and o-ring for $19.90.
I used a dremel tool with a small flap wheel abrasive to grind the putty from the hull. You have to be careful (hand scrapped) when cleaning the P79 transducer of any residual mounting putty. Use some 5200 or equivalent to remount the new flange and you should be good. Wear your knee pads and bring a small vac.
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Re: P79 Transducer question - R27

Postby ALICE J on Fri Jul 12, 2019 7:03 am

There is a small space under heater beneath the helm. I installed a transducer, glued to the hull with an angle spacer to make it level. I wanted a second transducer that was more forward so I would get a slightly earlier warning about shallow waters. I also installed a second depth sounder screen above the helm console.
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Re: P79 Transducer question - R27

Postby TugScout on Fri Jul 12, 2019 9:54 am

ALICE J wrote:There is a small space under heater beneath the helm.


Thanks! I will poke around in that area when I'm down at the boat today.

Cheers,
Mark
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Re: P79 Transducer question - R27

Postby Cutwater28GG on Fri Jul 12, 2019 12:30 pm

whilst its a cutwater 28 you might find some of the photos useful http://www.tugnuts.com/viewtopic.php?f=5&t=11272&hilit=sonar
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Re: P79 Transducer question - R27

Postby TugScout on Sat Jul 13, 2019 9:24 am

Cutwater28GG wrote:whilst its a cutwater 28 you might find some of the photos useful http://www.tugnuts.com/viewtopic.php?f=5&t=11272&hilit=sonar


Thanks! Nice installation. The first thing I noticed was how accessible the transducer is on your C-28. The access for mine is through the rear seat after removing the shelf the propane tank sits on. The reach is about 30" to get to the dang thing, much less actually work on it.

Cheers,
Mark
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Re: P79 Transducer question - R27

Postby NorthernFocus on Sat Jul 13, 2019 6:34 pm

Jeff58 wrote:I just repaired mine on a CW 28. iMarineUSA.com sells just the replacement cup and o-ring for $19.90...

My sounder has been getting progressively worse at losing the bottom over the course of this season so decided to check the fluid in the cup. Imagine my surprise when I discovered that Fluid Motion chucked the cup and plopped the transducer down on the hull with some caulking under it. Wondering whose brilliant idea that was. As much as I love the design of these boats and as impressive as the customer service is sometimes I wonder at the things that are done in the factory.

Thanks for the info on the source for purchasing just the cup.
Dan

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Re: P79 Transducer question - R27

Postby bob daily on Sat Jul 13, 2019 7:30 pm

Just a note: the Garman P-79 transducer is a entry level transducer! It is the least expensive one that Garman sells, there is a reason for that! As your unit is only as good as the transducer your using , just ask any USN Sonarman, which can usually be found at any waterfront bar! A in hull transducer has to transmit through the hull and losses signal strength depending oh hull thickness, for the P-79 that thickness is no more than 5/8 in, which most Ranger Tugs, and Cutwater boats will be borderline if not over. Most boat owners will not have any issues with the Garman P-79, however don't expect it to last or perform as the higher quality ones! For more info about this subject check out the Garman Transducer Selection Guide.
And I agree that if I was spending the money that a new boat cost I would expect that the equipment installed was of quality, and not the least expensive!
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Re: P79 Transducer question - R27

Postby Cutwater28GG on Mon Jul 15, 2019 10:04 am

When installed properly in the cutwater though the p79 can still hold the bottom down to 800 feet and see salmon trails. Yes it is not a side vu or a panoptix sonar but honestly even if cheap it’s not bad for most use cases.
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Re: P79 Transducer question - R27

Postby NorthernFocus on Mon Jul 15, 2019 10:17 am

Cutwater28GG wrote:When installed properly...

That's the real point isn't it.
Dan

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Re: P79 Transducer question - R27

Postby Cutwater28GG on Mon Jul 15, 2019 12:12 pm

yep
but to be fair I bet ranger customer service gets less queries than if they had installed with the cup. the cup is very prone to leaks through the gasket which would probably have driven a bunch of questions too.
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