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[Nige52]

I have bought a used Riva Riviera which I admire greatly but...
I found that the motor/coupling/prop-shaft were not aligned correctly as the motor sits on a rubber pad of some sorts, meaning that an extra turn of a screw pushes the motor in that direction.
I noticed when first running the motor that it didn't purr quietly and that it made a rrrrddd sound. On examination I found that the prop-shaft was slightly bent and that both plastic inserts in the tube were of an oval shape, meaning the shaft had over time wore them out allowing the shaft to vibrate.
I have now found that I can't buy the inserts separately and I need to replace the whole prop shaft and tube.

I started dis-mantling the innards, then found that the tube was in-cased in a white hard substance (Cascamite?) Please could someone advise me the best way to remove the existing aluminium tube without damaging the boat? I have a feeling that I'm about to embark on a mission of destruction.....

Thanks
Nige

[DARLEK1]

What diametre is the existing tube? And would it be possible so slide a thinner one down it to save ripping it out as that does not seem like a good option looking at the pictures.
 Paul...

[Nige52]

I've already tried the insets from other tubes I have, but they're all to small. The inside dia of the tube is about 6mm so puting another tube inside is not possible, I don't think anyway....
Nige

[Tankerman]

If you have access to a small lathe it would be quite easy to turn up new bushes to fit each end of the tube, drilled and reamed to suit a new propeller shaft. There would be no danger of damaging the boat this way.

Chris

[Nige52]

Thanks Chris, but unfortunately I don't have access to any machinery at all  Just a Dremel really
Nige

[andyn]

As a very last resort, you could do what I do. put the front of the boat upright between your legs and whack the end of the shaft with a hammer. I've never damaged a model doing it yet.

[wideawake]

I've already tried the insets from other tubes I have, but they're all to small. The inside dia of the tube is about 6mm so puting another tube inside is not possible, I don't think anyway....
Nige

Hi Nige

What about these.   Variuos lengths available

http://www.cornwallmodelboats.co.uk/acatalog/Raboesch_Precision_Propshafts.html

Raboesch Waterproof Propshaft 290mm M4 (6mm Tube)
Raboesch Precision Propshaft. Totally maintenance-free propeller shafts developed for finer-scale models and submarines. The bearing housings on the motor side have self-lubricating bronze bearings and G-rings for water tightness.

Overall tube length: 240mm
Overall shaft length: 290mm
Tube diameter: 6mm
Shaft: Stainless Steel (SS 304).4mm diameter, motor end plain with M4 thread for propeller
Sleeves: Brass, rear bearing: Delrin
Maximum RPM: 10,000
Part No: RAB301-01
Price: £15.04 (Including VAT at 17.5%)

HTH

Guyu

[Nige52]

As a very last resort, you could do what I do. put the front of the boat upright between your legs and whack the end of the shaft with a hammer. I've never damaged a model doing it yet.

I don't think I have the nerve to do that 

[barriew]

SHG used to have bushes in their catalogue. You should be able to buy some that will fit your existing tube and shaft! Don't know if they are on their web site, and I don't have one of their catalogues handy, but a telephone call after the holidays should get an answer.

Barrie

[Nige52]

Thanks,
I'll do that tomorrow, hopefully they'll be able to help.

[Patrick Henry]

Have a word with Mark(Mark's Model Bits)aka NoMustang Mark on here, he'll make you the bushes to fit the shaft. He's done loads of little bits like for me for Enterprise, damm good chap.


Rich