Lost Prop on Passage

[Ddunmire]

2:00 AM the wind died on passage from St Thomas to Jamaica. Noticed we we’re getting no propulsion from our 2020 Volvo D2 50 mates to a 130 S-D sail drive. Looked at the linkages to the transmission, all looked good. Thought we might have donated out prop to Davey Jones. Sailed to Ponce PR anchored and have soured new part and a diver. Was looking at the assembly and am thinking it’s not very robust, one lock washer . Someone said to use locktite, not sure if that will be effective for an under water install, another suggested using 4200. Any ideas or cautions? Thanks.

[fstbttms]

Are you talking about installing a new prop underwater? If so, this is the thread locker you want. Apply topside, of course:

[deblen]

Originally Posted by fstbttms

Are you talking about installing a new prop underwater? If so, this is the thread locker you want. Apply topside, of course:

I have no personal experience with this drive,but looking at OP's pic,the washer (#3 in pic) appears to be a tab lock type. It appears there is a bent tab aimed toward prop hub & 2 additional un-bent tabs. The un-bent tabs are meant? to be bent outwards around the bolt head after it is torqued??
My VP inboard prop uses one of these tab washers.


I found this video,but no lock washer is used?

https://www.youtube.com/watch?v=hbgxntSHnxo

[Panope]

Prior to the discovery, were you perhaps thinking:

"gee, the boat sure is sailing nice and fast" ?

[fstbttms]

Originally Posted by deblen

The un-bent tabs are meant? to be bent outwards around the bolt head after it is torqued??

One tab up, one tab down. That’s all it should need.

[Ddunmire]

Originally Posted by fstbttms

Are you talking about installing a new prop underwater? If so, this is the thread locker you want. Apply topside, of course:

Yes, installing underwater. Thanks for this recommendation

[Ddunmire]

Originally Posted by Panope

Prior to the discovery, were you perhaps thinking:



"gee, the boat sure is sailing nice and fast" ?

As a matter of fact, yes. My wife set the 3hr watch record on the boat which she insists must stand.

[SailingHarmonie]

Originally Posted by fstbttms

One tab up, one tab down. That’s all it should need.

That's all it should need, and I am pretty sure locktite will not add to things, but just my own anecdotal experience is that saildrives lose WAY more than their fair share of props. I don't understand why, the method of securing not significantly different that many shaft systems.

[fstbttms]

Originally Posted by SailingHarmonie

…my own anecdotal experience is that saildrives lose WAY more than their fair share of props.

This has been my experience as well.

[kenbo]

Originally Posted by fstbttms

This has been my experience as well.

I believe it's because the attachment relies solely on mechanical fasteners. Shaft props rely on the interference fit of the taper and mechanical fasteners.

Fstbttms, have you ever used VibraTite for underwater fastenings? I found it to be better than Loctite because even if the original torque tightening fails the nut or bolt won't unscrew because there's too much drag on the threads.

[fstbttms]

Originally Posted by kenbo

Fstbttms, have you ever used VibraTite for underwater fastenings? I found it to be better than Loctite because even if the original torque tightening fails the nut or bolt won't unscrew because there's too much drag on the threads.

I have not but I know divers that have. I think I’ll order a bottle.

[Ddunmire]

Originally Posted by fstbttms

Are you talking about installing a new prop underwater? If so, this is the thread locker you want. Apply topside, of course:

All I can find in Puerto Rico is loctite 243, so I’ll try that. Will apply it topside

[deblen]

It appears some propellor cone kits contain the 23680979 tab lock washer & some don't.
With the tab lock washer properly installed,it appears nearly impossible for the long bolt to loosen.
Could the lack of tab lock washer contribute to frequent prop loss on these drives?
Cheers/Len


https://www.generalpropeller.com/sai...o-Penta-850396


https://fybmarine.shop/volvo-penta-f...umber-23680979


https://www.wholesalemarine.com/volv...79-lock-plate/

[Ddunmire]

Originally Posted by deblen

It appears some propellor cone kits contain the 23680979 tab lock washer & some don't.
With the tab lock washer properly installed,it appears nearly impossible for the long bolt to loosen.
Could the lack of tab lock washer contribute to frequent prop loss on these drives?
Cheers/Len


https://www.generalpropeller.com/sai...o-Penta-850396


https://fybmarine.shop/volvo-penta-f...umber-23680979


https://www.wholesalemarine.com/volv...79-lock-plate/

What you’re saying makes a lot of sense. We’ve purchased the lock washer an we’ll make sure to use it.

[deblen]

Originally Posted by Ddunmire

What you’re saying makes a lot of sense. We’ve purchased the lock washer an we’ll make sure to use it.

From the various part suppliers pics,It appears that some "long bolts" are hex head,in which case the tab lock washer would work (lock) fine.
But in other diagrams/pics,the "long bolt" appears to have a round "allan /socket" style head ,in which case,the tab lock washer would be useless against that round style head.

Cheers/Len