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Airmar B60-20 Installation Question

Old 03-25-2007, 09:08 AM
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Default Airmar B60-20 Installation Question

I installed a B60-20 transducer in my fiberglass-hulled boat. I haven't hooked it up electrically yet, but it is installed in the hull. Advice gained from this Board was very helpful. The only hitch was that the rubber washer protruded 1/8" to 1/4" outside the transducer nut as I tightened the nut (just snug...not overtightened). Now I wish I had left out the washer, but the 3M 4200 has set up and I'd like not to uninstall it needlessly. If anyone has any experience like mine and it leaked, or not. I'd sure like to hear about it. Thanks.

By the way, the Airmar installation instructions call for a 2 3/4" hole saw for this transducer. That is INCORRECT. 2 3/8" works just fine.

Thanks again.

Bill
Old 03-25-2007, 10:04 AM
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Default RE: Airmar B60-20 Installation Question

I just installed the same transducer and ended up with the identical situation. If the nut tightened beyond "snug" the washer would be pressed way out of shape. With as much 4200 as I used, I feel confident that it won't leak. HOWEVER, the boat has not been back in the water so......I guess we will both have to wait and see.
Old 03-25-2007, 04:39 PM
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Default RE: Airmar B60-20 Installation Question

I have a b60-20 transducer also and I am going to install in the next week or so. I think
by reading the advice of this board I will leave the rubber washer out. In the directions, airmar makes it sound like you only use it in aluminum hulls. Bbogue and haggardscove minus the rubber washer is there anything else you learned when installing. I was curious if you followed warthog5 directions? Also, did you put the 3m 4200 fast just on the transducer or did you put in on both the transducer and the drilled hole? Sorry for all the questions just want to get it right the first time.

Will
Old 03-25-2007, 05:04 PM
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Default Re: Airmar B60-20 Installation Question

I installed mine last year based on the instructions that came with the unit. My instructions specified a 2 3/8 hole saw for a solid glass hull (2 3/4 is for the inside of a cored hull) and the illustration clearly showed using the gasket. Since there is such a tight fit in the hole, I did not bother to butter the edges. I tightened until the washer started to expand.

There was no leaking. More telling was that I had a problem with the unit and removing it was a a real PITA involving more that a little cursing and sweating. I installed the next one the very same way.
Old 03-25-2007, 08:32 PM
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Default Re: Airmar B60-20 Installation Question

Will,

I put a bead of 4200 on the flange of the 'ducer and on the threads only. A little goes a long way once you begin tightening. If the inside surface of your hull is pretty smooth, I'd ditch the washer. The idea of bordering around the 'ducer flange on the outside of the hull with tape 3/8" or so from the flange is a good one for a neat installation. Also, wear several pair of latex gloves so you can shed them as they get sealant on them...got these ideas from this Board...great!!

Bill
Old 03-25-2007, 08:33 PM
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Default Re: Airmar B60-20 Installation Question

Roger,

Thanks for your reply. I have more confidence in my installation now.

Bill
Old 03-25-2007, 11:34 PM
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Default Re: Airmar B60-20 Installation Question

The idea of bordering around the 'ducer flange on the outside of the hull with tape 3/8" or so from the flange is a good one for a neat installation.
3/8in is to much. More like 3/16in to 1/4in.

Here is transducer, notice the bead of 4200, dont go crazy, unless
you like a mess



Look real close and you can see a pencil line that was drawn around the X-ducer flange. That is used as a reference to taping.



The 2 small holes were filled latter. That is where the livewell scoop use to be.

Old 03-26-2007, 08:17 AM
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Default Re: Airmar B60-20 Installation Question

Warthog5,

Thanks so much for sharing your expertise. Have you had successful experiences with installations even though there were bulged washers as noted in these posts? Thanks again.

Bill
Old 03-26-2007, 08:08 PM
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Default Re: Airmar B60-20 Installation Question

I don't use the rubber washer.
Old 03-26-2007, 10:14 PM
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Default Re: Airmar B60-20 Installation Question

I just installed a B-60 and I had a problem with the inside of the bilge was uneven and had to grind it flat. I also used the washer but when I tightened it the washer started to squeeze out so I removed it. I tightened it and all is well. I would not use the washer as I feel much better having a nice tight flange.
Old 03-26-2007, 10:26 PM
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Default Re: Airmar B60-20 Installation Question

Same problem with my installation, uneven thicknesses. I put extra sealant around the washer & nut and it hasn't leaked a bit. I was going to take the washer off, I just thought it would be to messy to remove with wet sealant, so I left it on.

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