anode behind the props DP-G

[jon and michie]

Hi - I am thinking of doing the job of changing the anode behind my duo props myself and asking is there anything I need to be aware of ?
I am going to get the special tool to remove the prop - do I need anything else i.e grease etc.
Is there any torque settings I need to do as I dont want to lose the props in the drink.
More importantly is it a straight forward job

all opinions welcomed
Jon

 

[simonfraser]

Anything else one should do once it’s apart ?

 

[[2068]]

I tend to use a block of wood to prevent the propeller rotating, rather than messing around putting it in gear.
Also, it's worth cleaning the mating face on the back of the spinner cone, and the ring shaped surface on the prop that it engages with.
Otherwise the spinner cone can come undone, and the prop can fall off in Belgium, as happened to me :ambivalence:
Use plenty of grease on both the inner and outer shafts, give them a bit of a clean if required.
Check for fishing line or other tangled stuff that might have got wrapped near the seals.
The thrust rings (parts 6 and 9 on the diagram) can easily fall out of the props - make sure they are still there in the right place when you refit.
Removing part 7 requires the correct tool and reasonable arm strength.

 

[simonfraser]

Do the props fit back on one way only ?

 

[jct1981]

Yep; you’ll notice one has three and the other has four blades. Take a pic before you take them off for extra confidence- I do!

 

[jon and michie]

many thanks for the replies especially to flowerpower for the drawing.

Jon

 

[Ian h]

Also been told that the smaller prop should be fitted in specific way so that blades are not directly aligned to forward prop. Volvo Paul mentioned this when he serviced by boat .
Also remember to use correct grease on prop shaft or next year they will not come off.

 

[jon and michie]

Thank you Ian for the heads up.
I was planning on marking both props with a marker pen to make sure they go back as they where previously fitted.
I was also thinking of using Carlube Aquaslip which is a marine water proof grease.

Jon

 

[alt]

Also remember to use correct grease on prop shaft or next year they will not come off.

I use bog-standard grease and never had a problem. That said, I always take my props off annually (she's out of the water for 5 months of the year, boo)... they slide right off.

 

[BruceK]

Also been told that the smaller prop should be fitted in specific way so that blades are not directly aligned to forward prop. Volvo Paul mentioned this when he serviced by boat .
Also remember to use correct grease on prop shaft or next year they will not come off.

As they are contra rotating how on earth do you manage that?

 

[[2068]]

As they are contra rotating how on earth do you manage that?

It will run slightly more smoothly if you position the smaller prop so that blades from both props aren't directly inline with the exhaust plate at the same time.
(supposedly).

I never did this...

 

[alandalus11]

I tend to use a block of wood to prevent the propeller rotating, rather than messing around putting it in gear.
Also, it's worth cleaning the mating face on the back of the spinner cone, and the ring shaped surface on the prop that it engages with.
Otherwise the spinner cone can come undone, and the prop can fall off in Belgium, as happened to me :ambivalence:

Does that mean if I don't go to Belgium the prop won't fall off. :encouragement:
sorry couldn't resist

 

[BruceK]

It will run slightly more smoothly if you position the smaller prop so that blades from both props aren't directly inline with the exhaust plate at the same time.
(supposedly).

I never did this...

That makes more sense. :encouragement: