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DST-800 Installation
03-08-16, 08:54 AM
Post: #1
DST-800 Installation
Having problems getting a dst800 to seat in the thru hull with valve included with the transducer.

I am using yellow o-ring but transducer is very difficult to tighten and will not seat to the bottom of the thru hull. It appears to be about 1/4 to 3/8" from seating flush with the external surface of the thru hull.

Is there some trick to seating the yellow o-ring in the insert that would fix this?


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03-08-16, 10:06 AM (This post was last modified: 03-08-16 10:15 AM by Chuck - Raymarine - Moderator.)
Post: #2
RE: DST-800 Installation
Welcome to the Raymarine Forum Stephen,

The rotational force which you have described for the transducer's locking ring is considered normal with non-lubricated o-rings. After I applied a light coating of biodegradable soap to the o-rings of my DST-800, the force required to rotate the locking ring was reduced significantly, permitting the transducer insert then be easily within its housing.
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03-08-16, 10:34 AM (This post was last modified: 03-08-16 11:29 AM by Chuck - Raymarine - Moderator.)
Post: #3
RE: DST-800 Installation
Yes, I tried that using the silicone grease that came with it. That did make it easier, but it never went all the way in. Is that normal?
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03-08-16, 11:33 AM (This post was last modified: 03-08-16 11:39 AM by Chuck - Raymarine - Moderator.)
Post: #4
RE: DST-800 Installation
No. When fully seated, the depth sensing portion of the insert should be flush with the face of the housing. It is recommended that you verify that both o-rings have been lubricated, that you have not damaged the housing and insert's treads through cross-theading, and if not, that the locking ring be further rotated to force the insert further into its housing.
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