Genoa car - replacement sheave

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MINESAPINT2

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Just noticed my sheave has been seized for a while and has a big groove worn in it. Simple/cheap solution would be to replace sheave - wonder if replacements are available??. U sheave plastic/nylon +/- 40mm diameter 30mm wide 8mm pin.

Alternatively replace whole car but boat is 30 years old and I guess I will not be able to find a match. Will try to upload a photo later. Just tried but file too large.

Thanks

Mike
 
Sheaves are available but you might have to compromise on the pin diameter, either bigger or smaller. Smaller is easier to sort out with a drill bit. Big problem I have found is removing the 'pin' as riveted in place. Normally I replace with a bolt with a nyloc nut. If I'm lucky the bolt will have a plain shaft for the sheave to run on.
 
FWIW I used one of the harder fillers (“Chemical Metal” as I recall) to effect a temporary fix on a similarly worn sheave, once I had freed it up. The sheave was still working fine several years later when I sold the boat.
 
MINESAPINT2 said:
Just noticed my sheave has been seized for a while and has a big groove worn in it. Simple/cheap solution would be to replace sheave - wonder if replacements are available??. U sheave plastic/nylon +/- 40mm diameter 30mm wide 8mm pin.

Alternatively replace whole car but boat is 30 years old and I guess I will not be able to find a match. Will try to upload a photo later. Just tried but file too large.

Thanks

Mike
Click to expand...
a. Any photo editor should have a resample/resize function to reduce resolution.
b. You could have one turned by any machine shop. In fact, this can be done on a drill press with simple adaptation. Cut a rough blank with a hole saw, turn the outside, and then re-drill. Or you can easily re-turn one that is a little larger, if you can find such.

shopping
 
Get a suitable diameter bar of acetal or delrin. Should be able to find a local machine shop or hobbyist who will turn it to match existing. Make two while you're at it and do the other side.
 
As said the problem is getting the axle out as it is probably rivetted in. Drill in to each end of rivetted part to destroy it. Sheaves are usually easy to find replacements for. For the axle I used 6mm ss tubing in mine with a bolt and nut through it so cheeks are tightened against the tubing which is long enough to provide clearance each side of sheave. Or as said just fit a bolt with nylock nut. ol'will
 
Update.......

Thanks for all the advice and offers of help.

I discovered Osculati supply a perfect replacement for my sheave. 40mm diameter/33.5mm wide/8.3mm bore. Only issue was obtaining one. They are available from Italy or Latvia but very scarce in UK. A chandlery in London had them listed on their web site but when I contacted them they would have to order one in from Italy. ABC Powermarine had them listed on their ebay site as "out of stock". However when I phoned them to enquire whether they will be getting any stock soon they found one in their stock room - I will get it in a couple of days - £9.

I then spent an hour in my shed removing the damaged sheave and pin. Hacksawed down each side of the sheave and removed it along with the central section of the pin, being careful not to damage the aluminium car. Drilled out the 2 remaining bits of the pin at each side and cleaned it all up. I have some 8mm round 316 stainless solid bar to use as a rivet so just waiting for the sheave.

Bit of luck will be sailing again next week.

Mike
 
MINESAPINT2 said:
Update.......

Thanks for all the advice and offers of help.

I discovered Osculati supply a perfect replacement for my sheave. 40mm diameter/33.5mm wide/8.3mm bore. Only issue was obtaining one. They are available from Italy or Latvia but very scarce in UK. A chandlery in London had them listed on their web site but when I contacted them they would have to order one in from Italy. ABC Powermarine had them listed on their ebay site as "out of stock". However when I phoned them to enquire whether they will be getting any stock soon they found one in their stock room - I will get it in a couple of days - £9.

I then spent an hour in my shed removing the damaged sheave and pin. Hacksawed down each side of the sheave and removed it along with the central section of the pin, being careful not to damage the aluminium car. Drilled out the 2 remaining bits of the pin at each side and cleaned it all up. I have some 8mm round 316 stainless solid bar to use as a rivet so just waiting for the sheave.

Bit of luck will be sailing again next week.

Mike
Click to expand...
I think you will find the old axle had a reduced diameter end where it goes through the cheek so that the cheeks are kept apart by the axle. The turned down part goes through the hole and is riveted over. You could try without this step in the shaft (axle) but may find the cheeks want to squeeze together and foul the sheave. If you can turn down the ends of the shaft a little you may like to try holes and split pins to hold it in or even drill a hole in the end of the shaft and tap a screw in each end. As I said I used ss tubing for shaft and a smaller bolt with nylock nut right through. ol'will
 
Just learned how to resize my photos in the blink of an eye in Windows Live Photo Gallery. Heres a photo of thge repaired car. Thanks for all your advice. As a matter of interest does anyone know what make the car is, boat is 30 years old.

MikeGarmin issue 022 (1024x768).jpg
 
For the axle you can check Interscrews, Chicago Bolts or much more imaginative 'Sex' bolts. If you don't know Interscrews - try Google.

You can buy them in stainless, they come in a range of sizes, you might need to cut them down and can secure them, the 2 parts, using Loctite.

IMGP2623.jpeg


Jonathan
 
Most small pins holding any sheaves can be held in with some clevis pins held in either by riveting or with circlip of E clips in groves in the end to held the pin in to stop falling out but allows easy to replace the sheaves.

I have a number of pulles made all kinds of blocks using laser cut side plates and hanging straps similar to the Ronstan blocks.

Can be assembled in single, double and triple blocks.

A swivel hanger can be used to make swivel blocks.

sail blocks.jpg
 
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