nut size on volvo penta duoprop ?

[simonfraser]

no luck searching on this forum

what is the nut size on the rear end in the cone of a DPE duoprop ?

tnx

 

[matt8442]

Hi Simon, looks like it's 20mm from this video.. will post link in a second

 

[matt8442]

https://youtu.be/0q0scmMbB5E

 

[Assassin]

If its a 20mm thread it should be a 30mm socket if it is to ISO standard bolt head sizes but often they can be 27mm head.

 

[simonfraser]

tnx, will take that range of sockets and make a note in the boat doc this time !

 

[tico]

19mm socket

 

[simonfraser]

will take a 19mm too

 

[Momac]

Perhaps the appropriate prop removal tool would be a good investment. But be sure to buy the correct one for your outdrives.
Undoing the lock nut on the second prop is perhaps the greater challenge without the appropriate tool.
Part ref 873058 for 290dp-e , according to Keypart

 

[alt]

19mm from what I recall.

And as said above, the 'prop removal tool' is a MUST HAVE!

 

[Assassin]

Cannot be a 19mm nut on a 20mm thread as the thread is a larger diameter than the flats on the nut, for a 19mm head size the thread must be M12 and not 20mm as the video states, onless it isn't a nut, but a bolt instead.

 

[Boat2016]

Cannot be a 19mm nut on a 20mm thread as the thread is a larger diameter than the flats on the nut, for a 19mm head size the thread must be M12 and not 20mm as the video states, onless it isn't a nut, but a bolt instead.

Correct, I’m assuming we are talking about part 44 here. The thread the cone screws onto is about 20mm and the lock bolt screws inside the shaft.

https://www.marinepartseurope.com/en/volvo-penta-explodedview-7744470-44-7336.aspx

 

[simonfraser]

tnx all, finally found the spec in my boat doc, it is indeed a 19mm nut size.
(yes i do have a tool for the larger nut further in)

just in case any one else reads this, remove the prop on a regular basis and grease it again, else it gets stuck, experience ...

 

[Momac]

...., remove the prop on a regular basis and grease it again, else it gets stuck, experience ...

I used this
https://www.toolstation.com/white-grease/p10203
and the props removed easily a year later.

 

[alt]

Removing the props on an annual basis should be part of every 'winterise' schedule, IMO. I remove the props and clean them (brick cleaner), clean off old grease from the shafts (diesel on a rag works a treat), dry off, apply fresh grease and back on.

I do this with everything I own with a prop / shaft and i've never had an issue... prop slides off easily every year. Takes very little time.