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Re: Airmar / Raymarine DST800 Transducer Issue
It was installed according to the instructions by a Raymarine agent so I can only assume they did it correctly.
There is heaps of lubricant on the transducer and the blanking plug so I doubt it's a lack of lubricant causing the issue.
I know from Raymarine that Airmar had some issues and altered the design a couple of years ago, below is what Raymarine sent me prior to us having the new one installed;
"Regarding the DST800 snap ring, the the ring design was revised as a result of NCR712, reducing the ring gap from 0.56 to 0.112112 in on Airmar ECO 09E0197 with an effectivity date of 02/18/2010. Airmar has implemented the change on all affected products and has purged all of the "old" snap ring stock. If you can provide the serial number(s) or date code of the affected units I will confirm the mfg date and whether these units were assembled with the old or new snap ring version.
As you may recall, the risk of the original valve becoming dislodged requires the ring to be positioned with the gap positioned directly over the valve hinge. Assembly instructions include the orientation of the snap ring with ring gap 180 deg from the valve hinge. An incorrectly positioned ring could occur during assembly, or during post-delivery handling. The ring can be rotated by hand from the "as assembled" orientation (180 deg from the valve hinge) during installation or subsequent handling. Please note, that with the snap ring gap located over the valve hinge (incorrect placement or subsequent manual rotation), the valve body remains securely retained within the housing, but includes a higher risk of failure due to the size of the snap ring gap and valve hinge. "